理论与试验研究

冻融作用下冰碛体剪切特性与围岩压力研究

  • 陈志敏 ,
  • 刘耀辉 ,
  • 李宁
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  • 1. 兰州交通大学 土木工程学院,兰州 730070;
    2.中国市政工程西北设计研究院有限公司,兰州 730030;
    3.中铁第一勘察设计院集团有限公司,西安 710043
陈志敏(1979—),男,河北邢台人,博士,教授,现从事岩土与隧道工程的教学科研工作。E-mail:czm@mail.lzjtu.cn
刘耀辉(1999—),男,甘肃白银人,硕士,助理工程师,主要从事岩土与隧道工程领域的科研工作。E-mail:11200201.stu.lzjtu.edu.cn

收稿日期: 2023-06-15

  网络出版日期: 2024-05-09

基金资助

国家自然科学基金(12262018);中国建筑第二工程局有限公司科技资助计划(2020ZX150002);中央引导地方科技发展资金项目(22ZY1QA005)

Research on the Shear Characteristics of Moraine under Freeze-Thaw Action and the Surrounding Rock Pressure

  • Chen Zhimin ,
  • Liu Yaohui ,
  • Li Ning
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  • 1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China;
    2. CSCEC AECOM Consultants Co., Ltd., Lanzhou 730030,P.R. China;
    3. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, P.R. China

Received date: 2023-06-15

  Online published: 2024-05-09

摘要

冰碛体是由冰川作用搬运大量碎屑物质堆积形成的特殊岩土体。受赋存的地理及气候条件影响,冻融作用会对穿越该类围岩的隧道尤其是洞口段的工程建设带来挑战。笔者调研了中国西藏地区冰碛体围岩地质条件,设置冻融循环直剪试验研究了冻融循环次数与含水率对冻结冰碛体的力学特性和力学指标影响,引入冻融次数与含水率综合参数K,拟合得出黏聚力c公式。结果表明:冻融循环和含水率对冰碛体黏聚力c有较大影响。改进了太沙基理论,提出了适用于冰碛体围岩隧道洞口段的围岩压力计算公式。以昌林铁路某隧道为例,计算不同条件下的围岩压力,验证了公式的合理性。研究发现:冻融循环和含水率是影响冰碛体力学性能变化的重要因素,冻融作用对洞口段隧道围岩压力有不同程度的影响,在工程建设中应充分考虑。

本文引用格式

陈志敏 , 刘耀辉 , 李宁 . 冻融作用下冰碛体剪切特性与围岩压力研究[J]. 地下空间与工程学报, 2024 , 20(2) : 460 -470 . DOI: 10.20174/j.JUSE.2024.02.12

Abstract

Moraines are special rock and soil mass formed by the accumulation of large amounts of debris material transported by glacial action. Due to the geographical and climatic conditions prevailing, freeze-thaw action can pose a challenge to the construction of tunnels through this type of rock, especially in portal sections. The geological conditions of moraine surrounding rocks in Tibet, China, was investigated, and set up a direct shear test of freeze-thaw cycles to study the influence of the number of freeze-thaw cycles and water content on the mechanical properties and indicators of frozen moraine, introduced a comprehensive parameter K for the number of freeze-thaw cycles and water content, fit the formula for the cohesion c. The results show that the freeze-thaw cycles and water content have significant influence on the cohesion c. And proposed a formula for calculating the surrounding rock pressure applicable to the tunnel portal section of moraine surrounding rocks based on the Terzaghi theory. Taking a tunnel of Changlin Railway as an example, the surrounding rock pressure under different conditions was calculated to verify the reasonableness of the formula. The study shows that freeze-thaw cycles and water content are important factors affecting changes in the mechanical properties of moraines, and freeze-thaw action has different degrees of influence on the surrounding rock pressure in the portal section, which should be fully considered in the construction of the project.

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