碎石桩排水能力和井阻效应对复合地基孔压计算的影响  

Influence of Stone Column's Drainage Capacity and Well-resistance Effect on Pore-pressure Calculation of Composite Foundation

作　　者：冯艳辉 王武刚[2] 

机构地区：[1]云南精诚更善拆除工程有限责任公司,云南昆明650000 [2]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《水利与建筑工程学报》2014年第3期90-93,114,共5页Journal of Water Resources and Architectural Engineering

基　　金：天津市科技创新专项基金资助项目(07FDZDSF02100)

摘　　要：国内外许多学者基于假定桩体材料排水能力为无限大基础上,研究了碎石桩复合地基排水减压作用在饱和粉土地基抗震液化方面的特性。在实际工程中,碎石桩的排水能力与地基土体相比是在一个可比的数量级上,并不是无限大的。利用巴隆固结理论,优化相应的边界条件和初始条件,综合考虑在地震作用时间极短的状况下,引起的超孔压消散速度是有限的,以及散体材料本身会对进入桩体中的水的垂直渗流有一定的阻力作用等条件下,研究了碎石桩在地震作用期间的排水减压作用,并提出了由地震引起的碎石桩复合地基中超孔压发展规律的拟合公式。经过工程实例的对比分析,对碎石桩排水减压作用在抗震液化能力提高方面进行评价,为饱和粉土地基抗震液化设计提供一定的参考。Based on the assumption that the pile material’s drainage capacity is infinite ,many scholars at home and abroad have researched on the earthquake-resistance liquefaction characteristics of the stone column’s drainage capacity on saturated silt foundation .However ,in practical projects ,the drainage capacity of stone column is not infinite .Here , by using Barron consolidation theory ,and comprehensively considering that the dissipation velocity of the excess pore pressure induced by earthquake during the extremely short time is limited and the dispersed material has a certain resis -tance effect on verticle infiltration ,the drainage and pressure-reducing action of the stone column during earthquake was studied ,and the fitting formula for the development of the excess pore pressure was proposed including its generation , diffusion and dissipation .Meanwhile ,the action of the stone column for raising the earthquake-resistance liquefaction was evaluated through the comparison and analysis of engineering examples ,which would provide a certain reference for the design of saturated silt foundation .

关 键 词：碎石桩 渗透能力 井阻效应 抗震液化 超孔隙水压力发展模式 解析解公式 

分 类 号：TU472.1[建筑科学—结构工程]