岩溶地区嵌岩灌注桩承载性状试验研究  

Experimental research on bearing characteristics of rock-socket pile in Karst area

作　　者：朱佩宁 宋亚亚 齐昌广[3] 杨雄 何忠意 ZHU Peining;SONG Yaya;QI Changguang;YANG Xiong;HE Zhongyi(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd,Guangzhou 510663,China;Guangdong Tianxin Electric Power Engineering Test Co.,Ltd.,Guangzhou 510663,China;Faculty of Architectural,Civil Engineering and Environment,Ningbo University,Ningbo 315211,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [2]广东天信电力工程检测有限公司,广东广州510663 [3]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《人民长江》2020年第7期200-205,共6页Yangtze River

基　　金：国家自然科学基金项目(51608351,51508282);浙江省自然科学基金青年基金项目(LY18e080010)。

摘　　要：岩溶地区灌注桩施工难度大,成桩可靠性低。针对一岩溶地区灌注桩地基,利用钻孔数字测井系统和滑动测微计进行了嵌岩灌注桩成孔质量检测与桩身应力应变测试,验证了该岩溶地区灌注桩的成桩可行性及承载能力,给出了工程桩施工的建议。分析了弹性模量随桩身应力的变化关系,研究了不同荷载作用下桩侧摩阻力与桩端阻力的分布规律、桩侧摩阻力随桩顶沉降的发挥性状以及淤泥质土、粉质黏土层等的侧摩阻力随桩顶荷载的发挥性状。结果表明:该桩成桩效果好,承载力尚有较大发挥余地。研究成果可为本地区同类工程项目的设计和科研提供参考。The formation of pile pouring in-situ in Karst area is difficult. For a power plant in Karst area, quality inspection of bore forming and the stress and strain of rock-socket pile were tested by the system of bore-forming digital logging and sliding micrometer. According to the results, the construction feasibility and the bearing force of the pile in the Karst area were verified, and some advices on pile construction were offered. Besides, the following aspects were analyzed: the relationship between elastic modulus and stain of piles, the distribution of pile side friction force and tip force under different loads, the variation of side friction force with the settlement of piles, and the side friction force characteristics in mucky soil and silty clay. The results showed that the pile formation was good, and the bearing capacity had a large margin. The research results can be used as references for design and researches of similar projects in Karst area.

关 键 词：嵌岩灌注桩 承载性状 滑动测微计 静载试验 侧摩阻力 

分 类 号：TV553[水利工程—水利水电工程]