土工基础

›› 2017, Vol. 31 ›› Issue (3): 350-355.

• 工程实录 • 上一篇    下一篇

湘南煤系地层某路堑高边坡过程稳定性分析

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:2017-01-13 修回日期:2017-02-06 出版日期:2017-06-25 发布日期:2017-06-26
  • 作者简介:郑一晨（1990-），男，助理工程师，研究方向为岩土工程勘察设计。

Stability Evaluation of High Cut Slopes with Coal Lenses in Southern Hunan

ZHENG Yichen1, ZHANG Keneng2   

  1. (1.Guangzhou Urban Planning and Design Survey Research Institute, Guangzhou, 510060；
    2.Department of Geological Engineering, School of Geosciences and InfoPhysics, 
    Central South University, Changsha, 410083)
  • Received:2017-01-13 Revised:2017-02-06 Online:2017-06-25 Published:2017-06-26

摘要： 煤系土边（滑）坡工程案例在郴州地区最为常见，煤系土具有岩层软硬不均、层间胶结较差、结构松散、开挖后风化速度较快且遇水易软化、性能极不稳定和结构易破坏而丧失强度等特点。以郴州市骆仙岭骆仙西路北侧C区典型煤系地层边（滑）坡治理工程案例为研究背景，对其滑动失稳变化全过程进行分析研究，通过有限元FLAC3D三维数值模拟等手段，研究不同施工时序与过程稳定性控制之间的内在联系。并针对性采取应急抢险治理措施，治理后滑坡恶化趋势得到有效控制，达到预期安全性要求。

关键词: 煤系地层, 过程稳定性, 郴州地区

Abstract: Geohazards, such as, landslides, have plagued the urban development of Chenzhou City for years. Most of the potentially unstable slopes usually contain coal layers. Soil layers that containing coal lenses have the characteristics of uneven stiffness and compressibility; weak connections between the soil and coal layers; poorly structured; fast weathering after exposed in the ambient environment and fast slaking when adding water; extremely variable engineering properties and prone to significantly reducing the strength when their structure are disturbed. Project experience indicated that the conventional design and construction measures in mitigating the slope related geohazards by applying the current code are not completely satisfactory.  This paper presents a case history of the stability evaluation of a typical high cut slope with coal lenses in Chenzhou City. The progressive failure of a slope is three dimensional numerically investigated by using FLAC3D. The correlations among various construction sequences and the various degrees of stability are investigated. Mitigation measures for the landslides are proposed. The results indicate that the stability of the potential landslide area was improved.

Key words: Coal Strata, Slope Stability, Chenzhou Area