基于三维数字溶洞的桩基础下溶洞顶板稳定性验算方法研究  

Study on Checking Calculation Method of Karst Cave Roof Stability Under Pile Foundation Based on Three-dimensional Digital Karst Cave

作　　者：梁卫军 陈俊生[2] 刘叔灼[2,3] 饶城 Liang Weijun;Chen Junsheng;Liu Shuzhuo;Rao Cheng(China Communications Construction Co.Ltd.,Rail Transit Branch,Beijing 100000,China;School of Civil Engineering and Transportation,South China University of Technology State Key Laboratory of Subtropical Building Science,Guangzhou 510610,China;South China Geotechnical Engineering Research Institute,Guangzhou 510610,China)

机构地区：[1]中国交通建设股份有限公司轨道交通分公司,北京100000 [2]华南理工大学土木与交通学院亚热带建筑科学国家重点实验室,广州510610 [3]华南岩土工程研究院,广州510610

出　　处：《科技通报》2022年第11期78-83,107,共7页Bulletin of Science and Technology

基　　金：广东省自然科学基金(2020A1515010713)。

摘　　要：岩溶地层溶洞顶板的稳定性将直接影响场地上方桩基础的安全性,本文依托广州市轨道交通十二号线槎头车辆段项目,选取有代表性的溶洞,结合工程勘察资料、物探资料、桩基础施工图,利用CATIA建立三维溶洞模型,通过Midas GTS/NX有限元分析软件建立包含群桩、土层和三维溶洞模型的计算模型,通过有限元计算,根据结果显示的桩和溶洞顶板的竖向位移,验算桩基础下溶洞顶板的稳定性。结果表明:用CATIA软件和MidasGTS/NX软件来建模和验算桩基础下溶洞顶板稳定性的方法是直观可行的。The stability of karst cave roof in karst stratum will directly affect the safety of pile foundation above the site. Based on the project of chatou depot of Guangzhou rail transit line 12, this paper selects representative karst caves, combined with engineering survey data, geophysical exploration data and pile foundation construction drawings, establishes a three-dimensional karst cave model by CATIA, and establishes a three-dimensional karst cave model by Midas GTS/NX finite element analysis software For the calculation model of soil layer and three-dimensional karst cave model, the stability of karst cave roof under pile foundation is checked according to the vertical displacement of pile and karst cave roof shown by the results through finite element calculation. The results show that the method of modeling and checking the stability of karst cave roof under pile foundation with CATIA software and Midas GTS/NX software is intuitive and feasible.

关 键 词：溶洞顶板 桩基础 CATIA 群桩 三维溶洞 

分 类 号：TU457[建筑科学—岩土工程]