联络通道冻结工程中冻土力学性能研究及安全性评价  

Frozen Soil Mechanical Properties Research and Safety Evaluation of Cross Passage Freezing Engineering

作　　者：伍世龙 杨登献 谭远志 郑军 郭书刚 邢乐 WU Shilong;YANG Dengxian;TAN Yuanzhi;ZHENG Jun;GUO Shugang;XING Le(China Railway Guangzhou Engineering Group Co.,Ltd.,511458,Guangzhou,China;不详)

机构地区：[1]中国中铁广州工程局集团有限公司,广州511458 [2]中煤光华地质工程有限公司,邯郸056004

出　　处：《城市轨道交通研究》2022年第1期92-96,共5页Urban Mass Transit

摘　　要：以广州地铁7号线北滘新城站—林头站区间2#联络通道及泵房冻结工程为背景,开展冻土物理力学性能试验及冻结壁安全性评价。通过试验得到-5℃、-10℃以及-15℃条件下粉质黏土及粉细砂冻土单轴抗压应力-应变曲线,以及-10℃温度下粉质黏土及粉细砂冻土抗折强度。-10℃温度下,粉质粘土单轴抗压强度平均值为2.63 MPa,弹性模量平均值为82.93 MPa,抗折强度平均值为2.384 MPa;-10℃温度下,粉细砂单轴抗压强度平均值为3.22 MPa,弹性模量平均值为49.3 MPa,抗折强度平均值为2.048 MPa。利用ANSYS软件,结合冻土物理力学性能参数,模拟得到联络通道段及泵房冻结壁的第一主应力、剪应力以及位移。联络通道开挖后,冻结壁安全系数满足要求,能够保证联络通道暗挖施工过程的安全性和可靠性。Based on the freezing project of 2#cross passage and pump house of Guangzhou Metro Line 7 Beijiao New Town station-Lintou station interval,the physical and mechanical properties test of frozen soil and the safety evaluation of frozen wall are carried out.The uniaxial compressive stress-strain curves of silty clay and silty fine sand frozen soil at-5℃,-10℃and-15℃are obtained,as well as the flexural strength of silty clay and silty fine sand frozen soil at-10℃.At-10℃,the average uniaxial compressive strength of silty clay is 2.63 MPa,the average elastic modulus is 82.93 MPa and the average flexural strength is 2.384 MPa.At-10℃,the average uniaxial compressive strength of silty fine sand is 3.22 MPa,the average elastic modulus is 49.3 MPa,and the average flexural strength is 2.048 MPa.The first principal stress,shear stress and displacement of the frozen wall of the cross passage section and the pump house are simulated by using ANSYS software with the physical and mechanical parameters of the frozen soil.The safety factor of the frozen wall meets the requirements after the excavation of the cross passage,which ensures the safety and reliability of the underground excavation construction process.

关 键 词：地铁 联络通道 冻结法 力学性能 数值模拟 

分 类 号：U231.3[交通运输工程—道路与铁道工程]