大直径嵌岩桩承载特性的现场试验分析  

Analysis of Field Test on Bearing Capacity Characteristics of Large-Diameter and Rock-Socketed Piles

作　　者：邱喜[1] 尹崇清[2] 

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学西南水运工程科学研究所,重庆400016

出　　处：《建筑科学》2009年第1期73-77,共5页Building Science

摘　　要：嵌岩桩是一种钢筋混凝土现场灌注桩,桩身弹性模量与岩石地基弹性模量相接近,当桩身嵌入岩层后,能牢固地结合成为共同受力的整体结构。通过现场试验(静载荷试验和动测试验)分析,得出嵌岩桩的承载特性:嵌岩灌注桩的荷载传递和破坏特性主要与长径比、覆盖土层性质、嵌岩段的岩性和成桩工艺有关;大部分嵌岩灌注桩属于摩擦型桩;嵌岩灌注桩的嵌岩部分具有较高的侧阻力和端阻力;嵌岩桩的侧阻力与桩土摩阻力都是桩的侧阻力,但二者破坏机制、分布规律完全不同,桩土摩阻力沿桩的深度方向是均匀分布,而嵌岩桩侧阻力则是典型的非线性分布。Rock-socketed pile is a reinforced concrete field grouting pile, the elastic modulus of the pile body is similar to the elastic modulus of rock foundation. After the pile body＇s is embedded in rock, they can firmly become a whole structure to bear force together. By analysis of field tests of static load and dynamic measuring, it is concluded that load transfer and failure characteristics of the rock-socketed cast-in-place pile is related to length-diameter ratio, properties of overlying soil layer, lithology of rock-socketed segment and pile formation technology; it belongs to friction pile mostly; its rock-socketed part has higher shaft resistance and base resistance ; both the shaft resistance of the rock-socketed pile and its pile-soil friction resistance belong to shaft resistance of piles, but their failure mechanism and distribution law are completely different, pile-soil friction resistance is uniform distribution along depth direction, however, the shaft resistance of the rock-socketed pile is typical nonlinear distribution.

关 键 词：嵌岩桩 侧阻力 端阻力 嵌岩深度 承载特性 

分 类 号：TU473.1[建筑科学—结构工程] TU473.14[建筑科学—土工工程]