自平衡法桩端岩基载荷试验在重庆地区的应用研究  

Research on Application of Rock Foundation Load Test at Self-balanced Pile Ends in Chongqing

作　　者：胡晗 林亮伦[1] Hu Han;Lin lianglun

机构地区：[1]重庆市建筑科学研究院有限公司,重庆400016

出　　处：《重庆建筑》2021年第S01期31-35,共5页Chongqing Architecture

摘　　要：在重庆地区广泛分布的泥岩是建筑基础设计的主要持力层,且多为软质岩,根据岩体特征,采用原位载荷试验所得承载力参数进行基础设计更符合工程实际,但由于常规岩基载荷试验的局限性,阻碍了其推广应用。该文介绍了自平衡法桩端岩基载荷试验的工作原理、试验步骤及成果应用,统计了重庆市内12个项目多达98点的自平衡法桩端岩基载荷试验成果,得出如下结论:该试验方法操作简单、易行,优于常规岩基载荷试验;中风化泥岩桩端岩基承载力fuk与其天然单轴抗压强度frk比值λ主要集中于2.3~3.0之间,其相关性较好;采用该方法所得试验结果进行基桩优化设计,其经济效益显著,且安全可靠。The mudstone widely distributed in Chongqing region is the major bearing stratum in the building foundation design,and most of them are soft rocks.According to the characteristics of rock mass,it is more in line with the engineering reality to use the bearing capacity parameters obtained from the in-situ load test to conduct the foundation design.However,due to the limitations of the conventional rock foundation load test,the in-situ load test has been unsuccessfully popularized and applied.This paper introduced the working principle,test procedures and results application of the rock foundation load test at self-balanced pile ends,and counted the results of the load test results of up to 98 points in 12 projects in Chongqing,obtaining conclusions as follow:this test method is simple,easy to operate,and better than the conventional rock foundation load test;The ratioλof the bearing capacity fuk of the rock foundation at the moderately weathered mudstone pile ends to its natural uniaxial compressive strength frk is mainly concentrated between 2.3 and 3.0,with excellent correlation;The test results obtained with this method were adopted to optimize the design of foundation piles and produced significant economic benefits,safe and reliable.

关 键 词：自平衡法桩端岩基载荷试验 中风化泥岩 岩基承载力 单轴抗压强度 优化设计 

分 类 号：TU47[建筑科学—结构工程]