下部溶洞对抗滑桩的稳定性影响试验研究  

Experimental study on the effect of lower-partkarst cave on the stability of anti-slide piles

作　　者：杨鹏帅 范秋雁[1,2] 韩进仕 梁家珲 YANG Peng-shuai;FAN Qiu-yan;HAN Jin-shi;LIANG Jia-hui(College of Civil and Architecture,Guangxi University,Nanning 530004,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangdong Xiubang Agent Construction Engineering Management Co.,Ltd.,Huizhou,516000,China;Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学资源环境与材料学院,广西南宁530004 [3]广东修邦代建工程管理有限公司,广东惠州516000 [4]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《广西大学学报（自然科学版）》2020年第3期583-590,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(41162012)。

摘　　要：随着中国在岩溶地区边(滑)坡治理工程的广泛开展,岩溶地区抗滑桩的稳定性问题日趋突出。基于相似模型理论进行无溶洞和下部有溶洞两个室内模型试验,对下部存在溶洞时的抗滑桩受力和变形破坏进行研究,获得的研究结论如下:在破坏荷载作用下,模型发生脆性断裂,初始裂纹的产生位置向溶洞方向偏移,溶洞的存在影响裂纹初始产生位置;无溶洞模型抗滑桩水平极限承载力约为下部有溶洞模型的1.75倍,溶洞的存在显著降低了抗滑桩的稳定性;下部有溶洞时影响桩底应变场的分布,与无溶洞模型相比,同等荷载条件下,下部溶洞存在时桩底均为拉应变,更容易使抗滑桩发生失稳破坏;两个模型在加载过程中随着荷载的逐级增加声发射现象逐渐频繁,模型内部产生裂纹并逐步贯通,最终使模型发生脆性断裂。The wide spread of slope treatment engineerings in karst areas in China has highlighted the problem of the stability of anti-slide piles in karst areas.Based on the similar theory for model,two indoor model tests were carried out to study the stress and deformation failure of the anti-slide piles with or without a cave in the lower part.The research conclusions are as follows:Under the action of failure load,brittle fracture occurs in the model,and the initial crack location shifts to the direction of the cave.The existence of the cave affects the initial crack location;The ultimate bearing capacity of the anti slide pile without cave model is about 1.75 times of that with cave model.The existence of karst cave significantly reduces the stability of anti-slide pile;The distribution of the strain field at the bottom of the pile is affected when there is a karst cave in the lower part.Under the same load condition with that of the model without karst cave,the strain at the bottom of the pile with karst cave is tensile strain,which is more likely to cause the instability of the anti-slide pile;During the loading process,the acoustic emission phenomenon of the two models increases gradually with the increase of the load level by level.

关 键 词：岩溶 抗滑桩 下部溶洞 应变场 声发射 

分 类 号：TU411[建筑科学—岩土工程]