基于岩土工程原位测试技术的桩基水平承载力分析  

Analysis of Bearing Capacity of Laterally Loaded Pile Based on Geotechnical Engineering In-situ Testing Technology

作　　者：王舒[1] 段伟宏 马冲[3] 张涛[4] WANG Shu;DUAN Weihong;MA Chong;ZHANG Tao(Architectural Engineering College,Guizhou Minzu University,Gui yang 550025,China;The Communications Planning Surveying and Designing Institute of Shanai Province,Tai yuan 030012,China;School of Mathematics and Physics,China University of Geosciences（Wuhan）,Wuhan 430074,China;Faculty of Engineering,China University of Geosciences（Wuhan）,Wuhan 430074,China)

机构地区：[1]贵州民族大学建筑工程学院,贵州贵阳550025 [2]山西省交通规划勘察设计院,山西太原030012 [3]中国地质大学(武汉)数学与物理学院,湖北武汉430074 [4]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2018年第6期183-190,共8页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41807260);中央高校基本科研业务费专项资金项目(CUG170636;CUGL170807);湖北省自然科学基金项目(2018CFB385)

摘　　要：软土地区的高速公路与高层建筑经常选用桩基作为其基础,桩基础的水平承载特性对建(构)筑物的稳定性有着重要影响。为分析桩基础在水平荷载作用下的承载力特性,在传统的桩基p-y曲线计算方法的基础上,提出利用岩土工程原位测试数据计算桩基p-y曲线的方法,对现场两根钻孔灌注桩进行载荷试验与有限元模拟,并将基于岩土工程原位测试技术的桩基p-y曲线法计算结果与传统的Matlock桩基p-y曲线法计算结果进行对比分析。结果表明:基于岩土工程原位测试技术的桩基p-y曲线法可计算水平荷载下桩身水平位移、桩身截面弯矩和桩侧土体抗力;不同土层深度处得到的桩基p-y曲线与有限元模拟结果吻合较好,验证了本文所提出的方法的可靠性和适用性。基于岩土工程原位测试技术的桩基水平承载力评价方法可借助原位测试技术获得准确、可靠的土性参数,避免了原位取样、载荷试验所需的高额费用,为桩基水平承载特性研究提供了新的思路。Pile foundation is often chosen as the foundation of expressway and skyscrapers in soft soil area, and the horizontal bearing properties of pile foundation have an important influence on the stability of the structures. In or der to analyze the bearing capacity of pile foundation under horizontal load,this paper proposes a modified method by employing the data measured from in situ tests to calculate theP-y curve of pile foundation based on the tradi tional method. Then the paper carries out the in suit loading test and finite element simulation of two on site bored piles, and compares the results ofP-y curve method based on in situ testing technology and the traditional Matlock ＇s P-y curve method. The results show that theP-y curve of pile foundation based on in situ testing technology can be employed to calculate the horizontal displacement of pile body, bending moment of pile body section and lateral earth resistance of piles under horizontal loading. TheP-y curve obtained at different soil depths agrees well with the FEM simulation results, and furthermore, the applicability of the proposed model is verified. The evaluation method of pile horizontal bearing capacity based on geotechnical engineering in situ testing technology can obtainaccurate and reliable soil parameters by in situ testing technology,avoiding the high cost of soil sampling and load test,and provide a new idea of the research on horizontal hearing capacity of pile foundation.

关 键 词：岩土工程 原位测试技术 桩基础 水平承载力 P-Y曲线法 

分 类 号：X948[环境科学与工程—安全科学] TU473.1[建筑科学—结构工程]