不同桩体加固液化土性状的振动台试验分析  

Analysis on the properties of liquefied sand reinforced by different piles based on a shaking table test

作　　者：王菁悦 牛琪瑛[1] 崔志平[1] 赵瑞秀 赵军永 WANG Jing-yue;NIU Qi-ying;CUI Zhi-ping;ZHAO Rui-xiu;ZHAO Jun-yong(College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024

出　　处：《广西大学学报（自然科学版）》2018年第2期676-686,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：黄土地区公路建设与养护技术交通行业重点实验室和山西省重点实验室开放课题资助项目(KLTLRY13-3);国家自然科学青年基金资助项目(51408393)

摘　　要：为进一步研究不同桩体加固液化土机理,通过振动台模拟地震荷载,对性质不同的水泥土桩、碎石桩、水泥土桩与碎石桩复合加固液化土形式展开一系列试验,进行不同桩体加固液化土的研究。针对不同加固模式,采集不同埋深处的超静孔隙水压力、沉降量、土压力、加速度的相关数据,整理组合得出时程曲线,分析不同加固形式下液化土各变量之间的关系,探讨其变化规律。研究结果表明:水泥土桩加固土体遭受地震破坏在浅层,碎石桩加固、复合桩加固土体遭受地震破坏在中部;碎石桩加固有利于孔隙水压力消散,水泥土桩加固增强了土体刚度;实际工程尽量考虑采用碎石桩与水泥土桩复合加固形式加固液化土。In order to study the liquefied sand foundation reinforced by different piles,a shaking table test is carried out to simulate seismic loads.A series of experiments are conducted on the liquefied sand foundation reinforced by piles of different properties,including the cement-soil pile,the crushed stone pile as well as the composite pile made of cement-soil and gravel.The time-history curves of pore water pressure,settlement,earth pressure and acceleration at different buried depths of the piles are recorded,and the relationship among different parameters is analyzed.The results of the study show that soil reinforced by the cement-soil pile is damaged in the shallow layer under earthquake,and soil reinforced by the crushed stone pile as well as the composite pile is damaged in the middle layer.The reinforcement of the gravel pile is beneficial to dissipation of pore water pressure,and the reinforcement of the cement-soil pile strengthens soil stiffness.Practical projects should consider the combination of gravel pile and cement-soil pile to reinforce liquefied soil.

关 键 词：液化土加固 复合桩 振动台试验 沉降量 土压力 加速度 

分 类 号：TU473.1[建筑科学—结构工程]