碎石填芯钢管桩加固液化土的土压力分析  

Study on earth pressure distribution of liquescent sand foundation reinforced by gravel filling the core steel tube pile

作　　者：牛琪瑛[1,2] 王菁悦 汤黄俊 

机构地区：[1]黄土地区公路建设与养护技术交通行业重点实验室和黄土地区公路建设与养护技术山西省重点实验室,山西太原030006 [2]太原理工大学建筑与土木工程学院,山西太原030024

出　　处：《西安建筑科技大学学报（自然科学版）》2015年第5期630-634,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学青年基金(51408393);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(KLTLR-Y13-3)

摘　　要：为了研究碎石填芯钢管桩加固液化土地基的效果,制备碎石桩、钢管桩、碎石钢管复合桩及碎石填芯桩加固液化土四种模型,通过振动台试验,分析四种模型在振动过程中不同埋深处的超静孔隙水压力和土压力时程曲线,研究不同加固模型在不同埋深处超静孔隙水压力、土压力变化规律,得出碎石桩排水效果最为明显,在加固模型中起到排水通道、消散孔隙水压力的作用;钢管桩加固土体抑制土压力突变,提高地基土的整体强度;碎石桩与钢管桩复合加固不仅有效的抵抗土体液化、而且提高复合地基承载能力;碎石填芯钢管桩一桩起到两桩作用,除了起到降低孔隙水压力作用,还从土压力变化,说明增强复合地基土体的整体强度,提高地基的水平承载能力.In order to study the effect of liquescent sand foundation reinforced by gravel filling the core steel tube pile, four models, such as gravel pile, steel tube pile gravel pile and steel pipe pile composite and gravel filling the core steel tube pile composite reinforcement, were prepared by this paper which simulated seismic load to conduct shaking table test. Excess pore water pressure time curve in different depth and earth pressure time curve in different depth were sorted out in the four models. Analyzing the excess pore water pressure time curve variation of different reinforcement models in different depth, the drainage effect of gravel pile is such as most obvious. Gravel pile is the main drainage channel in the model, which plays a major role in dissipating excess pore water pressure, Steel tube pile reinforced not only inhibits the soil pressure mutations, but also improves the horizontal shear force of foundation soil as a whole. making use of gravel pile and steel pipe pile composite reinforcement can effectively resist soil liquefaction and improve foundation bearing capacity. Taking the place of two kinds of piles,gravel filling steel tube pile not only reduces a certain number of pore water pressures to improve soil pressure and strengthen soil body strength, but also improves horizontal bearing capacity of foundation.

关 键 词：碎石填芯钢管桩加固 振动台 超静孔隙水压力 土压力 液化土 

分 类 号：TU473.1[建筑科学—结构工程]