岩溶区嵌岩桩桩端承载力影响因素室内缩尺模型试验及数值模拟分析  

Indoor Scaled Model Test and Numerical Simulation Analysis on the Influencing Factors of Toe Bearing Capacity of Rock-Socketed Piles in Karst Area

作　　者：彭敏艺 袁杰 单毅 童华炜[1] 崔杰[1] PENG Minyi;YUAN Jie;SHAN Yi;TONG Huawei;CUI Jie(School of Civil and Transportation Engineering,Guangzhou University Guangzhou 510006,China)

机构地区：[1]广州大学土木与交通工程学院,广州510006

出　　处：《广东土木与建筑》2025年第3期48-52,共5页Guangdong Architecture Civil Engineering

摘　　要：溶洞的存在对桩基的设计和施工造成了巨大的安全隐患,对桩基进行现场试验的效率低且经济效益不高。文中以广州市花都区为工程背景,基于相似理论,利用室内缩尺比例模型试验及数值模拟两大研究手段进行模型加载试验和数值模拟。结果表明,溶洞直径增大会导致桩端承载力下降且存在边界效应;溶洞顶板厚度增加至4D时,承载力与无溶洞相当;水平距离大于3D时,溶洞对承载力无影响;溶洞远离桩端或无溶洞时,模拟与实测结果吻合。The existence of karst caves creates great safety hazards for the design and construction of pile foundations,and the field test of pile foundations is inefficient and economically ineffective.Takes Huadu District of Guangzhou City as the engineering background,based on the similarity theory,using the two major research means of indoor scaled model test and numerical simulation for the indoor model loading test and numerical simulation.The results show that the increase of the diameter of the cavern will lead to the decrease of the pile end bearing capacity and exist the boundary effect;The bearing capacity is comparable to that of no cavern when the thickness of the cavern roof increases to 4D;When the horizontal distance is more than 3D,the cavern has no effect on the bearing capacity;The simulation and the measured results coincide with each other when the cavern is far away from the pile end or there is no cavern.

关 键 词：岩溶地区 嵌岩桩 缩尺比例模型试验 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]