嵌岩桩抗拔特性现场试验研究  

Field Test Study on Uplift Characteristic of Rock-socketed Piles

作　　者：杨柏 马建林[1] 林大富 张文涛 孙珍茂[2] YANG Bai;MA Jianlin;LIN Dafu;ZHANG Wentao;SUN Zhenmao(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Sichuan Electric Power Design&Consulting Co.Ltd.,Chengdu Sichuan 610016,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]四川电力设计咨询有限责任公司,四川成都610016

出　　处：《铁道建筑》2018年第7期87-91,共5页Railway Engineering

基　　金：国家重点研发计划(2016YFC0802203)

摘　　要：依托国家电网路平—富乐500 k V双回线路工程中嵌岩抗拔桩极限载荷试验,针对其中3根等截面抗拔桩,对其上拔荷载-桩顶位移关系,桩身轴力及桩身侧阻力等特性进行了分析。结果表明:在本试验研究范围内,相同的岩土层中,增加桩长,可以显著提高抗拔桩的极限承载力,减小桩身位移。岩性是影响抗拔桩极限承载力的重要因素,相同厚度各岩土层提供抗拔力的能力比(即各岩土层的桩侧阻力之比)为土层∶强风化砂岩∶中风化砂岩=1∶3.8∶9.3;随着嵌入中风化砂岩深度的增加,抗拔桩极限承载力呈近线性增加。The engineering background ofthis paper is the rock-socketed pile in the national network Luping-Fule 500 kV double-circuit line project.A field test study on the uplift capacities ofthree same-cross-section piles is conducted.The relationship between the uplift load and the pile top displacement,the axial force,and the lateral resistance of the pile are analyzed.The results show that the increase of the pile length within the same rock layer may significantly increase the ultimate bearing capacity of rock-socketed piles and decrease the pile displacement.Lithology is an important factor affecting the ultimate bearing capacity ofuplift pile.In this test,the capacity ratio of each rock layer ofthe same thickness is 1∶3.8∶9.3 in terms of the average anti-pull forces of soil,strongly weathered sandstone,and Meso-weathered sandstone.With the increase of the pile depth in Meso-weathered sandstone,the ultimate bearing capacity of the anti-pull piles linearly increases.

关 键 词：嵌岩抗拔桩 等截面桩 抗拔特性 嵌岩深度 现场试验 

分 类 号：TU473.1[建筑科学—结构工程]