广州地铁联络通道冻结工程冻土力学特性试验研究  

Experimental Study on the Mechanical Behavior of Artificial Frozen Soil in the Guangzhou Metro Connection Passage Project

作　　者：邵晨晨 岳丰田[2] 张勇[2] 石荣剑[2] 

机构地区：[1]上海市岩土地质研究院有限公司,上海200072 [2]中国矿业大学力学与建筑工程学院,徐州221116

出　　处：《现代隧道技术》2013年第5期118-122,共5页Modern Tunnelling Technology

基　　金：上海市科学技术委员会科研计划项目(10231200400)

摘　　要：冻土力学特性参数是工程设计和施工的重要参考量，为保证冻结工程施工的安全性和合理性，文章以广州地铁6号线某联络通道冻结施工为例．对冻土进行了无侧限单轴抗压强度、抗弯强度、破坏挠度、结冰温度以及冻胀融沉试验分析。研究结果表明：在-10％恒温条件下，各类土层无侧限单轴抗压强度为6．43—9．48MPa，强度指标较自然状态下得到大幅提高；抗弯强度为2．97—5．67MPa，破坏应变和破坏挠度满足施工要求；结冰温度在-0．5℃-O．6℃之间．冻胀率和融沉系数分别在10．79％～12．44％和11．06％-13．48％之间。The mechanical behavior parameters of frozen soil are an important reference for engineering designand construction. To ensure the security and rationality of construction, some tests were carried out concerning the uniaxial unconfined compression strength, bending strength, failure deflection, freezing temperature, frost heave ratio, and thaw settlement coefficient of frozen soils using the example of a connection passage of the Guangzhou metro line 6. The results show that： uniaxial unconfined compressive strength of various soil layers is greatly improved at -10℃ compared with that at a natural state, reaching 6.43-9.48MPa; the bending strength is between 2.97MPa and 5.67MPa; the failure strain and the failure defection meet the construction requirements; the frozen temperature is between -0.5℃and 0.6℃; the frost heave ratio is 10.79%-12.44%; and the thaw settlement coefficient is 11.06%-13.48%.

关 键 词：地铁 联络通道 人工冻土 力学特性 冻结温度 冻胀率 融沉系数 

分 类 号：U455.49[建筑科学—桥梁与隧道工程] U456.3[交通运输工程—道路与铁道工程]