土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (4): 679-682.

• 测试技术 • 上一篇    

府河河道沉积土卸载回弹模量及影响因素分析

王 波1，易岳林1，李世昌2,3   

  1. （1.安徽省交控建设管理有限公司，合肥 230088；2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071；3.中国科学院大学，北京 100049 ）
  • 收稿日期:2022-07-09 修回日期:2022-07-19 出版日期:2022-08-30 发布日期:2022-08-25
  • 作者简介:王 波（1982-），男，高级工程师，研究方向为工程管理。

Analysis of Unloading Ratio Rebound Modulus of Soil Samples in the Compression Rebound Test

WANG Bo1， YI Yuelin1， LI Shichang2,3   

  1. （1.Anhui Traffic Control Construction Management Co., Ltd., Hefei 230088；
    2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071；
    3.University of Chinese Academy of Sciences, Beijing 100049）
  • Received:2022-07-09 Revised:2022-07-19 Online:2022-08-30 Published:2022-08-25

摘要： 府澴河河道区域性开挖工程是长江新城建设的先期重点项目，河道拓宽拓深带来的下部地层回弹变形将影响上跨高铁桥梁的安全运营。针对主要开挖地层，开展了粉质黏土与淤泥质粉质黏土的室内压缩-回弹试验，探讨了卸载比、卸载应力水平对土体回弹模量和回弹率的影响。试验结果表明，土体的侧限压缩模量及回弹模量随上覆压力呈非线性变化，随着上覆压力的增大，压缩模量与回弹模量均有所增大；土体回弹模量和回弹率随着卸载比的增加不断减小；随着卸载应力水平的增大，回弹模量逐渐增大，回弹率逐渐减小。

关键词: 压缩-回弹试验, 卸载比, 临界卸载比, 回弹模量

Abstract: The regional excavation project of Fuhe river channel is an early key project of the construction of the Yangtze River new city. In this project, the rebound deformation of the lower stratum caused by the widening and deepening of the river will affect the safe operation of the high-speed railway bridge. In this paper, the laboratory compression rebound tests of the silty clay and the muddy silty clay were performed for the main excavated strata, and the effects of unloading ratio and unloading stress level on the rebound modulus and rate of rebound of soil are discussed. The test results show that the lateral compression modulus and rebound modulus of the soil vary nonlinearly with the overburden pressure, and both of them increase with the increase of overburden pressure; the rebound modulus and rebound of soil decrease with the increase of unloading ratio; with the increase of unloading stress level, the rebound modulus increases and the rebound decreases.

Key words: Compression Rebound Test, Unloading Ratio, Critical Unloading Ratio, Rebound Modulus

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