灰岩地区超大吨位荷载下嵌岩桩承载力特性分析

Analysis of bearing capacity characteristics of super tonnage rock-socketed piles in limestone area

基于南宁市灰岩地区进行的超大吨位桩基静载试验,对桩身轴力和变形进行了测量,并利用有限元软件分析了桩长、桩径、长径比3个因素对灰岩地区嵌岩桩承载特性的影响。试验结果表明:嵌岩深度约为10 m的试验桩最大试验荷载在31 000~36 000 kN,能够达到设计承载力要求,而嵌岩深度约为5 m的试验桩承载力均达不到设计承载力要求;嵌岩深度对灰岩地区嵌岩桩的承载特性影响最大,嵌岩段越长,桩的承载力越高。

Based on the static load test of super-large tonnage piles in limestone area of Nanning, the axial force and deformation of the pile were measured. The test results show that the maximum test load of the test pile with socketed depth about 10 m is 31 000-36 000 kN, which can meet the design bearing capacity requirement, while the bearing capacity of the test pile with the socketed depth about 5 m couldn′t meet the design bearing capacity requirement. In the limestone area, the socketed depth has the greatest influence on the bearing characteristics of socketed piles.The longer the socketed section is, the higher the bearing capacity of the piles will be. The influence of pile length, pile diameter and length-diameter ratio on bearing characteristics of rock-socketed pile in limestone area is analyzed by finite element software.