土工基础

›› 2018, Vol. 32 ›› Issue (6): 571-573.

• 工程实录 •    下一篇

湘南某煤系土路堑高边坡基于流变性稳定性分析

郑一晨1,张可能2   

  1. （1.广州市城市规划勘测设计研究院，广州 510060；2.中南大学地球科学与信息物理学院地质工程系，长沙 410083）
  • 收稿日期:2017-02-10 修回日期:2017-02-21 出版日期:2018-12-20 发布日期:2018-12-21
  • 作者简介:郑一晨（1990-），男，硕士研究生，助理工程师.研究方向为岩土工程勘察。

Stability Analysis Considering Rheology on the High Cut Access Road Slope of a Coal Mine in Southern Hunan

ZHENG Yichen1， ZHANG Keneng2   

  1. (1.Guangzhou Urban Planning and Design Survey Research Institute Co., Ltd., Guangzhou 510060；2.Department of Geological Engineering School of Geosciences and Info-Physics, Central South University, Changsha, 410083)
  • Received:2017-02-10 Revised:2017-02-21 Online:2018-12-20 Published:2018-12-21

摘要： 郴州地区的开挖边坡支护设计大多依据极限平衡理论，往往忽视了煤系地层边坡的渐进性破坏过程以及非均质性、不连续性和各向异性及流变时效特性。在流变效应作用下，煤系土边坡长时间有着着无显著滑移面的地质运动，当坡体蠕动变形达到临界值后可发生局部垮塌甚至大规模整体滑坡。对郴州地区煤系地层进行流变性分析不仅要考虑土的流变性理论，而且要考虑软岩的流变性理论。基于对以往地质工作者的研究分析总结，通过Burgers模型、长期强度理论，运用极限平衡法和流变性理论分析郴州地区卜里坪K2+740-K2+800段开挖边坡的稳定性变化过程，进而预测边坡蠕变破坏周期提供预警。

关键词: 煤系地层, 流变性, 郴州地区

Abstract: The limit equilibrium stability analysis is the major design methodology for the supporting system for the high cut slopes in Chenzhou area. This analytical approach ignores many observed coal mine soft rock instability phenomena, such as, progressive failure, nonhomogeneous & heterogeneous in rock properties, noncontinuous as well as time related rheology. Under the action of rheology, the cut slope might result in a local instable and then progressive revolute into a global failure without a prominent slip surface been developed. When the time related creep movement reaches a threshold value, the local slope failure and even global landslide might occur. For the stability analysis work of access road slope in the soft rock coal mines, in addition to the creep characteristics of overburden soil, the rheologic properties of the soft rock mass soil also be considered. Based on a literature review of the stability analysis considering the rheology, this paper presents the stability analysis results of highway section between K2+700 and K2+800. Both the limit equilibrium and the rheology approaches are used and the Burgers model that considering the longterm strength was used in the analysis.

Key words: Coal Mine Strata, Rheology Property, Chenzhou Area