节理型黄土开挖边坡塌滑破坏机理Collapsed sliding failure mechanism of slope excavation in joint loess
连宝琴,王新刚
LIAN Baoqin,WANG Xingang
摘要(Abstract):
黄土节理控制着黄土区地下水或者地表水的运输通道,黄土节理的发育致使黄土节理扩张为局部大的拉张裂隙,在拉张力作用下使得黄土高原地区塌滑灾害频繁发生。通过野外调查和分析,提出了黄土开挖边坡塌滑破坏可分为4个阶段:坡脚侵蚀剥落阶段、坡顶拉裂阶段、垂直裂隙扩展阶段、边坡整体塌滑破坏阶段。结合工程实例,通过概化的三维数值分析模型,使用岩土工程软件FLAC3D模拟分析了在3种降雨量条件(40 mm/d、80 mm/d、100 mm/d)下,降雨2 d后概化模型的塌滑破坏情况,这可为工程地质条件相同地区的黄土开挖边坡塌滑变形破坏的分析以及防治提供一种有效分析范例。
Transport channels of groundwater or surface water in loess area are controlled by loess joint, loess joint development leads to the loess joint expansion and becomes local large tensile cracks, collapse sliding disasters have occurred frequently under the action of tension in the loess plateau. Through the field investigation and analysis, the collapse loess slope sliding failure can be divided into four stages: slope erosion peeling off stage, the top tensile splitting stage, vertical crack expansion stage and slope overall collapse sliding failure stage. The collapse sliding failure situation was simulated and ion analyzed by using the geotechnical engineering software FLAC3 D through 3d numerical analysis model in combination with practical engineering cases in three rainfall conditions(40 mm/day, 80 mm/day, 100 mm/day) after two raining days, providing an effective analysis paradigm for analysis and control of collapse sliding deformation and failure under the same engineering geological conditions in excavation of loess slope.
关键词(KeyWords):
黄土节理;塌滑破坏;塌滑阶段;数值分析
loess joint;collapsed sliding failure;collapse and sliding stage;numerical analysis
基金项目(Foundation): 国家自然科学基金面上项目(41172281);; 中央高校基本科研业务费专项资金项目(摇篮人才计划CUGL10-0413;特色学科团队CUG090104);; 国家重点基础研究发展计划(973计划)课题(2011CB710604)
作者(Author):
连宝琴,王新刚
LIAN Baoqin,WANG Xingang
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