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20 February 2011, Volume 25 Issue 1    Next Issue

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Interaction Analyses Between Rock-socketed Pile Structure and Deep Foundation Pit Excavation of Subway GUO Xiao gang1, WU Wei xing1, SUN Guan hua2 2011, 25 (1):  1.  Abstract ( 3075 )   Save Based on Mingdu metro station of Wuhan as a project case, the simulating model was constructed and the interaction between the high\|rise structure with rock\|socketed pile at close range and the deep foundation pit excavation of metro station was analyzed. Results showed that the differential settlement of high\|rise structure with rock\|socketed pile was influenced by the construction of deep foundation pit excavation of metro station, but the influence was not significant. Therefore, the rock\|socketed pile was beneficial to the stability of the deep foundation pit excavation. Related Articles | Metrics

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Construction Method of Fault and Crush Zone in Horizontal Rock Strata RAN Mao lun1, GUAN Hui hui2, ZHU Jian qun2 2011, 25 (1):  4.  Abstract ( 2339 )   Save The fault and crush zone was one of the geological structures which blocked up the tunnel construction. Especially, when the rock strata was horizontal, the collapse would be happened during tunnel excavation, which made it difficult. The probability and extent of collapse of WuBang 1# tunnel was analyzed by means of the geological forecast in advance. Then the technique of the advanced small pipe and the grouting of the mixture of cement and sodium silicate are adopted to reinforce the surrounding rock. Meanwhile the deformation of surrounding rock was monitored and related data was feedback to guideline the construction, which made the construction informational. It proved that the deformation of surrounding rock was controlled and the construction of fault zone was securitized. Related Articles | Metrics

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Final Settlement Method of Subgrade CHEN Zhi hui 2011, 25 (1):  7.  Abstract ( 2615 )   Save There were many methods to calculate the final settlement of subgrade embankment according to the settlement monitoring result. The graphical hyperbolic method and improved hyperbolic method was introduced, then the consolidation degree of foundation was also calculated. The above discussed method was used in the engineering, its result was compared with the result calculated by the logarithmic method and the expotential curve method, there was no obvious difference among them by comparison. Related Articles | Metrics

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Strength Property Analysis of T-shaped Bidirectional Soil-cement Deep Mixing Pile HE Li hong, PENG Ding xin, QIN Ya qiong, FAN Wei 2011, 25 (1):  10.  Abstract ( 2620 )   Save The application, merits and demerits of deep foundation treatment in Wuhan Sixin region was introduced, then the application of T\|shaped Bidirectional Soil\|cement Deep Mixing Pile in this region was also introduced. Its strength was analyzed by SPT and unconfined compression strength test, meanwhile the equation between SPT's blow counts and pile's unconfined compression strength, depth of pile's segment. Related Articles | Metrics

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Application of Combination Supporting Structure  in Deep Foundation Pit Enigeering HE De hong 2011, 25 (1):  14.  Abstract ( 2614 )   Save Based on the deep foundation pit supporting engineering in Zhengzhou CBD, the application of different support combinations was introduced, which indicated that this method not only the project quality and the construction safety were guaranteed, but also the projectcost and the construction period were reduced, which was provided as the reference for the design and construction similar engineering. Related Articles | Metrics

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Application of Concrete Angle Stay in Support of Deep Foundation Pit PENG Dian hua, HU Li yun, LIANG Yu 2011, 25 (1):  17.  Abstract ( 3030 )   Save The deep foundation pit in soft soil was supported by concrete angle stays, in which the deformation uncontrolling of foundation pit for traditional support was overcome. From the engineering, it had such advantages as the definite knowledge of loaded regime and the reliable structure, in which not only the foundation pit's deformation was controlled, but also its convenient construction, meanwhile the security of surrounding environment was guaranteed. Related Articles | Metrics

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Application of Compaction Gravel Pile in Soft Soil Foundation YANG Bo, CHEN Yan ru 2011, 25 (1):  20.  Abstract ( 2528 )   Save The compaction gravel pile is one treatment of soft soil foundation. Based on the engineering, its design, construction and reinforced scheme is analyzed, then its reinforced effect is evaluated. Related Articles | Metrics

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Design and Construction of Grouting Concrete Pile in Soft Soil Foundation JIANG Jian bing1, YE Zhi yong2, HOU Hong wei3, LU Jian ping3 2011, 25 (1):  23.  Abstract ( 2808 )   Save The grouting concrete pile composite foundation was the man\|made composite foundation, which was composed of grouting concrete pile with soil surrounded piles. Its design and construction to reinforce the soft soil foundation was introduced. Related Articles | Metrics

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Loading Experiment on Super Long-span Concrete-Filled Steel Tube Arch Bridge LI Hua luan 2011, 25 (1):  25.  Abstract ( 2275 )   Save There was the loading experiment on super long\|span concrete\|filled tubular arch bridge to test whether its stress condition and bearing capacity satisfied with requirement. The three dimensional finite element model was established to calculate its structure deformation and internal force under the design load. Meanwhile, considered the arch bridge deformation and stress influenced by temperature, its temperature of arch bridge was real\|time monitored and the relationship between the temperature deformation and related stress was obtained. Based on the temperature correction, the deformation and stress of arch bridge under the actual loading condition was revised. Result showed that the rigidity of arch bridge was satisfies with the requirement of design. Related Articles | Metrics

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Application of Equal Dimension Autoregressive Mode in Tunnel Settlement Monitoring QI Zhen jiang, ZHANG De lin 2011, 25 (1):  30.  Abstract ( 2058 )   Save The technology of settlement monitoring in the railway high speed passenger dedicated line was introduced and the application of autoregressive model in data processing of settlement monitoring was discussed, then the tunnel settlement data was analyzed by the equal dimension autoregressive model, in which the engineering quality was guaranteed and the construction cost was decreased. Related Articles | Metrics

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Blasting Vibration Monitoring and Analysis of Short Clear Distance Section in Xiongdu Tunnel ZHU Hong yang, WAN Yao fang 2011, 25 (1):  33.  Abstract ( 2510 )   Save According to monitoring and measurement of blasting vibration of Xiongdu tunnel, the dynamic response law on the condition of blasting vibration was explained. Results showed that the strict blasting control was executed in adjacent tunnel close to the explosion source, in which the security criterion of multi parameters of blasting vibration was used. The vibration velocity was depended on the distance of blast center and monitoring location, the shorter the distance of blast center was, the greater the vibration velocity was. The vibration velocity at tunnel wall is the maximum, the one of spandrel second, the one of wall foot minimum. The radial vibration velocity of every monitoring site was greater than the vertical which was greater than the tangential. The radial vibration frequency was smaller than the tangential which was smaller than the vertical radial vibration velocity and frequency of every monitoring site was similar to the velocity and frequency synthesized by three dimensional vector. Therefore, the blasting vibration monitoring was simplified by only monitoring the radial vibration velocity and frequency at the tunnel wall on the similar condition. Related Articles | Metrics

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Application of Root-pile to Reinforce Foundation under Retaining Wall ZHANG Zai bao 2011, 25 (1):  37.  Abstract ( 2783 )   Save Based on the foundation reinforcement of retaining wall in Yong-Tai-Wen railway project, the mechanism, design, construction and quality testing of root pile technology was introduced. Test results showed that the property of retaining wall was improved. Related Articles | Metrics

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Hydration Heat Analysis of Box Girder WANG Xiao zhen 2011, 25 (1):  41.  Abstract ( 2393 )   Save There was a huge thermal stress of concrete in box girder during its hardening for the large concrete volume and the hydration heat of cement. The temperature field and the stress field of box girder were analyzed by the finite element method for transient thermal stress, in which its temperature field and stress field were analyzed during different periods after concrete pouring and its disadvantageous bearing positions during cement hydration were summarized. Meanwhile in order to degrade the hydration heat, the hydration heat of concrete containing different quantities of cement was analyzed. Results showed that the thermal stress of box girder was reduced by low-heat cement, which indicated the cracking risk of concrete was reduced. Related Articles | Metrics

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Strength Test and Mechanism of Softening of Chlorite Schist ZHOU Hui1,2, YANG Xin1, HU Qi zhi1, CHENG Chang bing2 2011, 25 (1):  45.  Abstract ( 2578 )   Save The chlorite schist sample from the Jingping Ⅱ Hhydropower Prjoect on Yalong River was saturated by the saturated NaCl solution and the distilled water, its uniaxial and conventional triaxial test was done in the RMT and MTS test machine, in which the strength index of saturated and dry state in different solutions was obtained. Compared with its mechanical parameters' change and analyzed its micro\|mechanism of electric double layer, results showed that the strength of chlorite schist under water was decreased obviously, which showed its softening under water because of the influence of its electric double layer, the more the thickness of electric double layer was, the more the decrease of the chlorite schist's strength was, vice versa. Related Articles | Metrics

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TDR Reflection Characteristic of Coaxial Cable Under Pure Shearing LIU Yu chuan, LI Xie 2011, 25 (1):  49.  Abstract ( 2225 )   Save The TDR reflection characteristic of coaxial cable in different types under pure shearing is tested by self-design experimental facility. First, the accuracy of shearing position by TDR is checked. Then the relationship between TDR reflection coefficient and shearing displacement and the mechanics property of different types of coaxial cable are summarized, and both of the reflection characteristic of coaxial cable in domestic and abroad was compared, the replacement feasibility of imported coaxial cable by home coaxial cable is discussed, and finally the SYWY-75-9(4P) coaxial cable is choosed to replace the imported coaxial cable. Related Articles | Metrics

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Slope Dynamic Rule Analyzed by Life Cycle Concept LI Jing 2011, 25 (1):  53.  Abstract ( 2553 )   Save The concept of slide life cycle was suggested based on the fact that there was the whole process of birth, grow and death for slide. Its dynamic rule was analyzed during its single life cycle and the periodical change was described by the stability coefficient, then its characteristics of dynamic, phasical and progressive with time change was discussed. The stability coefficient was divided into tendency, periodic and random and was analyzed by fitting, the homomorphic model was founded, which was provided as the reference for slide forecast. Related Articles | Metrics

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Geoenvironmental Problems on Landfills of Municipal Solid Waste XIE Yan 2011, 25 (1):  57.  Abstract ( 2542 )   Save Landfill of municipal solid waste (MSW) is a special kind of geotechnical structures constructed with linear system and collection system for gas and leachate. The characteristics of MSW is different from other soils, because of its great grains, complicated components and high temperature. The osmotic suction is influenced by the solute of leachate. The compression of MSW is influenced by the bio\|degradation, while its strength is influenced by the reinforcements of the fiber materials. Soil and ground water are easily contaminated the leakage of leachate, in which three different transport types of contaminants includes: the rules of advection, diffusion and adsorption. The influence of multi field coupling action of solid, gas, liquid, and thermo should be considered for the settlement calculation and stability analysis and the influence of the suction should be further studied. Related Articles | Metrics

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Fractal Estimation on Shear Strength and Section Roughness of Sacked Cemented-soil HUANG Duan yang, MA Shi cheng 2011, 25 (1):  61.  Abstract ( 2375 )   Save Based on the fractal geometry theory, the fractal parameters(β、A、D) of the sacked cemented\|soil were measured and calculated by using the root\|mean\|square slope angle method (ARMSS). The joint roughness coefficient (JRC) was calculated. In addition, the shear strength was estimated by using the Barton's JRC-JCS model. Results showed that the ARMSS method was convenient to calculate JRC and its shear strength value was similar with the shear strength value by direct shear test, which was provided as the reference for the engineering design and construction. Related Articles | Metrics

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Research on Displacement Back Analysis of Surrounding Rockof Tunnel Based on BP Neural Network LI Jing cheng1, LIU Zhi feng2 2011, 25 (1):  65.  Abstract ( 2178 )   Save According to the monitored data in Yinzuiyan tunnel, the displacement back analysis of surrounding rock of highway tunnel was studied based on BP neural network. The excavation and lining of tunnel was simulated by FLAC3D to establish the relationship between the parameters combination of tunnel and the displacement calculation, then the samples used to BP neural network's training and testing was established, too. The model of displacement back analysis was obtained by training and testing these samples. Finally, the mechanical parameters of surrounding rock stability was back analyzed based on this model according to the monitored data in Yinzuiyan tunnel, in which the mechanical parameters was provided for the stability evaluation of surrounding rock of Yinzuiyan tunnel.   Related Articles | Metrics

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Reliability Analysis of Foundation Pit by Finite Elements Method MENG Qing yin 2011, 25 (1):  70.  Abstract ( 2411 )   Save The stability evaluation of foundation pit is an important geotechnical engineering problem. There is strong variability in soil properties of foundation pit, therefore the reliability analysis method is an appropriate method to evaluate the stability of foundation pit. The excavation and support of foundation pit is simulated by elastic-plastic finite elements method, the security coefficient of foundation pit was obtained by the strength reduction method, then its reliability was analyzed by the Rosenblueth statistical moment method. The method is convenient and results are reasonable, which is valuable for the design and construction of foundation pit. Related Articles | Metrics

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Geophysical Detection of Quality Inspection for Cement-soil Deep Mixed Pile Composite Foundation and Sand Pile Composite Foundation CHEN Shi qi 2011, 25 (1):  74.  Abstract ( 2571 )   Save Deep cement mixed (DCM) pile, jet mixing pile, and sand pile were commonly used for soft ground improvement, in which their quality was tested by loading test or core drilling method, but there are several shortcomings in these methods, for example, test results couldn't reflect the integrity of composite foundation. By in situ test of geophysical detection for composite foundation of sand pile, DCM and jet mixing pile, its compatibility was discussed. Test results showed that the integrity of composite foundation could be tested by these two geophysical detections. Related Articles | Metrics

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Geology Analysis for Seismic Disaster in Wenchuan TAN Zhou di1, BO Jing shan2 2011, 25 (1):  78.  Abstract ( 2059 )   Save Wenchuan earthquake was the most serious disaster and the widest seismic area since the P. R. China was founded and had the wider area of high seismic region, which was resulted from the location of canyon area and sliding\|prone stratum, particularly the geological characteristic of Longmenshan fault. It was the giant north\|south structure with NE~SW trend, which located on the boundary of two large structures and was north part of east boundary of Qinghai\|Tibet plate, in which there were the fracture zones as the boundary except the east boundary. Longmenshan fault was composed of many fractures, which had the NE and NNE trends. Because of these fractures, its seismic type was the multi fracture seismic, therefore, it was the typical multivariate seismic. Related Articles | Metrics