水泥预加固-人工冻结联合工法加固地层冻胀特性  

Frost Heave Characteristics of Ground Reinforced by Cement Pre-reinforcement-artificial Freezing Combined Method

作　　者：王帅儒 金修伟 陈士军[1] 鹿庆蕊[1] 张敏思[1] 谢胜军[1] WANG Shuai-ru;JIN Xiu-wei;CHEN Shi-jun;LU Qing-rui;ZHANG Min-si;XIE Sheng-jun(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,China;China Construction Shenzhen Decoration Co.,Ltd.,Shenzhen 515100,China)

机构地区：[1]东华理工大学土木与建筑工程学院,南昌330013 [2]中建深圳装饰有限公司,深圳515100

出　　处：《科学技术与工程》2024年第13期5566-5576,共11页Science Technology and Engineering

基　　金：国家重点实验室开放基金(NR1930);国家自然科学基金(52168044);江西省研究生创新基金(YC2021-S650,YC2021-S652)。

摘　　要：以广州地铁十四号线一个联络通道冻结工程为背景,采用联合工法施工,通过有限元软件建立联络通道冻胀位移场三维数值模型,研究了盐水温度和水泥掺量对土体冻胀位移的影响,并计算不同冻结壁厚度下地表冻胀位移量以及联络通道开挖土体的塑性区域,在满足施工安全的前提下,进一步对冻结壁设计参数进行优化,以减小土体冻胀位移。结果表明:采用水泥预加固-人工冻结联合工法施工,当水泥掺量设定为12%,盐水温度控制在-31~-25℃时,积极冻结末期,地表冻胀位移能够满足工程监测要求;水泥掺量设定为12%,冻结壁厚度设定在1.8 m,盐水温度控制在-31℃。可见相对于原施工方案,采用联合工法施工,积极冻结末期地表冻胀量减小了73%。Taking the freezing project of a connecting passage on Guangzhou Metro Line 14 as the background,a joint construction method was adopted.A three-dimensional numerical model of the freezing and swelling displacement field of the connecting passage was established through finite element software.The influence of salt water temperature and cement content on soil freezing and swelling displacement was studied,and the surface freezing and swelling displacement under different freezing wall thicknesses and the plastic area of the excavated soil in the connecting passage were calculated.Under the premise of ensuring construction safety,further optimize the design parameters of the frozen wall to reduce soil frost heave displacement.The results show that when the cement content is set to 12%and the saline temperature is controlled at-31~-25℃,the surface frost heave displacement can meet the engineering monitoring requirements at the end of active freezing.The cement content is set to 12%,the thickness of the frozen wall is set to 1.8 m,and the brine temperature is controlled at-31℃.It can be seen that compared with the original construction scheme,the surface frost heave at the end of active freezing is reduced by 73%by using the combined construction method.

关 键 词：联合工法 冻胀位移 数值模拟 冻结 水泥 

分 类 号：U455[建筑科学—桥梁与隧道工程]