湘南煤系地层某路堑高边坡过程稳定性分析  

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

作　　者：郑一晨 张可能[2] 

机构地区：[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

出　　处：《土工基础》2017年第3期350-355,共6页Soil Engineering and Foundation

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。Geohazards, such as, landslides, have plagued the urban development of Chenzhou City for years. Most of the po- tentially 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 ex- posed 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 satisfacto- ry. 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 vari- ous construction sequences and the various degrees of stability are investigated. Mitigation measures for the landslides are pro- posed. The results indicate that the stability of the potential landslide area was improved.

关 键 词：煤系地层 过程稳定性 郴州地区 

分 类 号：P642[天文地球—工程地质学]