岩溶区桩端下伏溶洞顶板稳定性分析研究  

Analysis of Stability of Cave Roof under Pile Tip in Karst Area

作　　者：赵明华[1] 张锐[1] 胡柏学[2,3] 袁铜森[2] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082 [2]湖南省交通科学研究院,湖南长沙410015 [3]长沙理工大学,湖南长沙410015

出　　处：《公路交通科技》2009年第9期13-16,31,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(50578060)

摘　　要：在总结归纳岩溶区溶洞顶板稳定性分析方法的基础上,针对目前桩端下伏溶洞顶板稳定性验算方法中存在的问题进行相应改进,在溶洞顶板抗冲切、抗剪验算中分别引入格里菲斯判据和莫尔判据,对抗剪验算全面考虑了桩端岩层剪切破坏和溶洞平面投影边缘处岩层剪切破坏2种破坏模式,对完整、无裂隙顶板采用圆形固支板模型验算抗弯稳定性,最后将该方法应用到某公路大桥的溶洞顶板稳定性验算中,计算结果表明该方法简单、实用。Based on the summary of analysis methods on cave roof stability in karst area, some aspects of the existing methods on checking computation of cave roof stability under pile tip were improved. Griffith criterion and Mohr criterion were introduced into checking computations of anti-punch-shearing and anti-shearing capacities of cave roof respectively. The terrane shearing failure under pile tip and that around the planar projection edge of cave were considered comprehensively in checking computations of anti-shearing capacity. A circular clamped plate model was adopted to check the anti-bending capacity of the complete roofs without fracture. Finally, the proposed method was applied to analyze the cave roof stability under a highway bridge and the result shows that the method was simple and practical.

关 键 词：道路工程 岩溶 岩石破坏判据 顶板稳定性 破坏模式 

分 类 号：U416.161[交通运输工程—道路与铁道工程]