岩石强度特性与嵌岩桩桩端极限阻力  

Rock strength characteristics and research on rock-socketed pile-tip ultimate resistance

作　　者：胡德华[1] 蒋桃荣 潘登[1] 张小敏[1] 

机构地区：[1]武汉工程大学环境与城市建设学院,湖北武汉430074 [2]湖北省化学工业研究设计院,湖北武汉430074

出　　处：《武汉工程大学学报》2009年第12期40-43,共4页Journal of Wuhan Institute of Technology

摘　　要：从岩石的强度特性与本构关系出发,深入分析嵌岩桩桩端岩石应力状态与入岩部分桩侧阻强化现象,并根据三轴强度表达式论述桩端岩石的极限承载力远高于按单轴抗压强度的计算值;现行《建筑桩基技术规范》中嵌岩桩单桩竖向极限承载力标准值仍沿用岩石的单向应力状态的抗压强度—无侧限抗压强度计算,混淆了桩端岩石的实际应力状态;本文依据桩端岩石应力状态分析结论,提出了嵌岩桩极限阻力标准值的计算理念与方法,并结合工程试桩实例予以说明.From the strength of the rock properties and constitutive relation, the depth analysis was made of rock-socketed pile-tip of rock stress state and the phenomenon of pile shaft resistance enhanced into the rock part. The authors expound of the rock pile-pit ultimate bearing capacity is much higher than the uniaxial compressive strength in accordance with the calculated based on triaxial compressive strength. The current Technical Code for Building Pile Foundation ultimate vertical bearing capacity of a single rock-socketed pile maintain its standard value of the compressive strength of unidirectional stress state-unconfined compression strength, distort the actual stress state of the pile-pit rock. In this paper,based on analysis of the conclusions the stress state of the pile-tip rock,the concepts and methods of calculation on the ultimate resistance characteristic value of rock-socketed piles is put forward, and pile test in combination with examples of project is described.

关 键 词：无侧限抗压强度 泊松比 三轴压缩强度 嵌岩桩 极限阻力 

分 类 号：TU452[建筑科学—岩土工程] TU473.112[建筑科学—土工工程]