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嵌岩桩的极限端阻力发挥特性及其端阻力系数
鲁先龙1, 乾增珍2, 杨文智1, 郑卫锋1
1.中国电力科学研究院有限公司, 北京 100191;2.中国地质大学(北京) 工程技术学院, 北京 100083
摘要:
嵌岩桩极限端阻力发挥特征及端阻力系数取值是岩土工程中嵌岩桩应用的重要研究课题之一。收集整理了不同地区学者在不同时期、不同岩石性质和不同嵌岩条件下开展的165个嵌岩桩端阻力试验成果,主要包括嵌岩段岩石类型及其天然单轴抗压强度、嵌岩直径与嵌岩深度、嵌岩桩极限端阻力等。定义嵌岩桩极限端阻力与岩石天然单轴抗压强度的比值为嵌岩桩端阻力系数,分析了桩径、嵌岩深度、嵌岩深径比和岩石强度对嵌岩桩极限端阻力和端阻力系数的影响规律,建立了嵌岩桩极限端阻力及端阻力系数与岩石单轴抗压强度之间的拟合关系式。
关键词:  嵌岩桩  端阻系数  端阻力  嵌岩深径比  抗压强度
DOI:10.11835/j.issn.2096-6717.2019.068
分类号:TU411
基金项目:国家电网公司科技项目(GCB17201600230)
Statistical analysis on end-bearing capacity and resistance factor for rock-socketed piles
Lu Xianlong1, Qian Zengzhen2, Yang Wenzhi1, Zheng Weifeng1
1.China Electric Power Research Institute, Beijing 100192, P. R. China;2.School of Engineering and Technology, China University of Geosciences, Beijing 100083, P. R. China
Abstract:
It is of great importance to investigate the characteristics of end-bearing capacity and to determine the resistance factor for rock-socketed piles. In this study, based on the results of 165 compression load tests several key issues with regard to the end-bearing capacity behavior of rock-socket piles were examined. These load tests were conducted on different rocks with different rock-socketed pile conditions throughout the world. The influential factors include the type and the uniaxial natural compressive strength of rocks, the diameter and the embedment depth of socketed piles, and the ultimate end-bearing resistances. In this study, the ratio of ultimate end-bearing capacity to the unconfined compressive strength of the rock was defined as the end-bearing resistance factor of rock-socketed pile. Effects of the key factors on the ultimate end-bearing capacity and the end-bearing resistance factor were comprehensively investigated. An empirical equation between the unconfined compressive strength.
Key words:  rock-socket pile  end-bearing resistance factor  end-bearing capacity  ratio of pile rocketed depth to diameter  compressive strength
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