高速公路路基岩溶顶板安全厚度确定方法  

Determination Method of Safety Thickness of Karst Cave Roofs Under Freeway Subgrade

作　　者：陈勇鸿 陈志[2] 

机构地区：[1]湖南省娄新高速公路建设开发有限公司,湖南娄底417000 [2]湖南省交通科学研究院,湖南长沙410015

出　　处：《公路工程》2009年第3期6-10,19,共6页Highway Engineering

基　　金：湖南省交通厅科技进步与创新计划(200810)

摘　　要：介绍了岩溶顶板安全厚度的常规确定方法及其适用条件。基于随机介质理论,推导了岩溶坍塌引起的地表及岩层的移动和变形计算公式。根据地表变形保护等级的要求,以变形控制提出了高速公路路基岩溶顶板安全厚度确定方法。基本岩移参数能够直接利用监测的变形资料进行反分析求得,能综合反映整套地层性状对地表移动的影响。该方法不仅可用于评价公路下伏岩溶对路基的稳定性影响,而且可预测出溶洞坍塌引起的地表变形,为高速公路的路基设计提供依据。Common determination methods of safety thickness of karst cave roofs are introduced. Based on the stochastic medium, formula for the movement and deformation of rock mass induced by karst cave collapse are derived. According the protection level of ground deformation, determination method of safety thickness of karst cave roofs under freeway subgrade is put forward by deformation con- trol. Basic rock movement parameters can be get through measurement data by back analysis, which can reflect the influence on the ground movement by the characters of strata. The method not only can be used to estimate the influence on freeway subgrade safety by karst caves, but also can be used to predict ground deformation induced by karst cave collapse, which is useful for freeway subgrade design.

关 键 词：变形破坏判据 随机介质理论 地表移动 溶洞顶板 

分 类 号：TU45[建筑科学—岩土工程] U416.1[建筑科学—土工工程]