摘要
以上海地铁9号线为工程背景,在现场实测的基础上,采用计算程序DBLEAVES对地铁循环荷载作用下隧道周边软黏土的动力响应特性进行了研究。研究表明:在地铁循环荷载作用下,隧道周边软黏土的沉降规律为绕隧道向外弧形扩散,沉降值越来越小,直至影响范围边界,地表沉降呈沉降槽形式发展;最大沉降发生在隧道正下方,通过拟合得出土体的最终沉降量为19.8 mm;加速度响应方面,其空间分布形式同沉降规律,隧道右下方土体内的加速度及其衰减速度均略大于右上方土体;在循环荷载加载初期,土体内的超孔隙水压力上升很快,几乎呈线性发展;随着循环次数的增加,逐渐趋于稳定并向边界消散;超孔隙水压力比土体的有效应力小得多,隧道下方土体在循环荷载作用下不会发生液化现象。
Based on the project of Shanghai Metro Line 9 and the filed measurement,a calculation program DBLEAVES was adopted to study the dynamic response characteristics of soft clay around tunnel under subway cyclic loads.The research results show that:under subway cyclic loads,the settlement law of soft clay around tunnel is arc spreading out around tunnel and the value is getting smaller and smaller until the boundary of influence.Ground settlement develops in the form of settlement trough.The largest settlement occurs directly below the tunnel and the final settlement of soil around tunnel is 19.8mm by fitting.In terms of acceleration response,the spatial distribution rule of acceleration response is the same as that of settlement.Acceleration and the decay rate of the right-bottom soil around tunnel are slightly larger than that of top-right soil.At the beginning of cyclic loads,excess pore water pressure of soil is rising quickly with nearly linear development and gradually intends to be stabilized and dissipated to the boundary with the increase of the number of cycles.Excess pore water pressure is much smaller than the effective stress of soil,so the liquefaction phenomenon will not happen below the tunnel under subway cyclic loads.
作者
蒲黍絛
叶斌
王海诚
郭维祥
陈再谦
PU Shutao;YE Bin;WANG Haicheng;GUO Weixiang;CHEN Zaiqian(Guiyang Survey Design & Research Institute Co.Ltd.,Power Construction Corporation of China,Guiyang 550081,Guizhou,P.R.China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,P.R.China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第2期19-26,共8页
Journal of Chongqing Jiaotong University(Natural Science)
关键词
隧道工程
地铁隧道
循环荷载
动力响应
数值计算
tunnel engineering
subway tunnel
cyclic loads
dynamic response
numerical calculation
