水泥改良土冻胀对地层位移场影响的三维有限元分析  

THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF INFLUENCE OF CEMENTED SOIL FROST HEAVE ON STRATUM DISPLACEMENT FIELD

作　　者：王效宾[1] 杨平[2] 胡俊[2] 

机构地区：[1]常熟理工学院经济与管理学院,常熟215500 [2]南京林业大学土木工程学院,南京210037

出　　处：《内蒙古农业大学学报（自然科学版）》2016年第5期91-97,共7页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51278251);住房和城乡建设部科技项目(2016-K5-060)

摘　　要：为揭示水泥改良土冻胀对地层位移场的影响规律,促进人工冻结技术的发展,以南京地铁10号线盾构出洞水平冻结加固工程为例,对水泥改良土加固区冻胀引起的地层位移进行了三维数值模拟分析,研究了冻胀位移场的发展分布规律,并分析了不同因素变化对水泥改良土冻胀位移场的影响,计算结果表明:在冻土帷幕上方产生向上的冻胀位移,越靠近冻土帷幕,竖向位移越大;冻土帷幕左右两侧冻结时产生方向相反的水平位移;地表位移随着与出洞口距离的增加先增大后减小,最大冻胀位移并不在冻土帷幕的正上方;覆土厚度越大,地表位移越小;冻胀率、冻土壁厚度和冻土壁长度越大,地表位移越大;冻胀率和冻土壁厚度变化对位移场分布无影响,覆土厚度和冻土壁长度变化既影响水泥土冻胀位移场的大小,也影响位移场的分布。In order to reveal the influence rule of cemented soil frost heave on stratum displacement field and promote the development of artificial freezing technology, taking the shield tunneling level freezing reinforcement project in one subway as an example, 3D numerical simulation analysis is made on the stratum displacement caused by frost heave in the cemented soil reinforcing area, the development distribution rule of frost displacement filed is studied, the influence of different factors on cemented soil frost heave displacement field is also analyzed, the calculation results show that ： for the upward frost displacement produced at the top of the freezing soil curtain, the closer to the freezing soil curtain, the larger the vertical displacement is; the opposite horizontal displacement is produced when the left and right side of the freezing soil curtain is frozen; the surface displacement is first increased then decreased with the increasing distance from the outlet, the maximum frost displacement is not just above the freezing soil curtain; the larger the thickness of the covering soil, the smaller the surface displacement is, the larger the frost heaving ratio, the thickness of frozen wall and the length of frozen soil wall, the greater the surface displacement is ; the variation of frost heaving ratio and the frozen soil wall thickness has no effect on the distribution of displacement field, the covering soil thickness and the length of frozen soil wall on one hand has effect on the size of the cemented soil frost heave displacement field, on the other hand, it also affect the distribution of the displacement field.

关 键 词：水泥改良土 冻胀 地层位移场 三维有限元分析 

分 类 号：U456[建筑科学—桥梁与隧道工程]