裂隙岩体不均匀冻胀性研究

doi:10.16285/j.rsm.2019.0699

岩土力学 ›› 2020, Vol. 41 ›› Issue (4): 1161-1168.doi: 10.16285/j.rsm.2019.0699

裂隙岩体不均匀冻胀性研究

夏才初^{1, 2}，王岳嵩^{1, 2}，郑金龙³，吕志涛^{1, 2}

1. 同济大学土木工程学院地下建筑与工程系，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092； 3. 四川省交通运输厅公路规划勘察设计研究院，四川成都 610041

收稿日期:2019-04-17 修回日期:2019-07-21 出版日期:2020-04-11 发布日期:2020-07-01
作者简介:夏才初，男，1963年生，博士，教授，博士生导师，主要从事岩石力学、隧道与地下建筑工程，能源地下结构和地下储存方面的教学与研究工作
基金资助:
国家自然科学基金（No.51778475，No.41472248）；四川省交通运输厅科技项目（No.2016B2-4）。

Study of differential frost heave of fractured rock mass

XIA Cai-chu^{1, 2}, WANG Yue-song^{1, 2}, ZHENG Jin-long³, LÜ Zhi-tao^{1, 2}

1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Sichuan Provincial Transport Department Highway Planning, Survey, Design, and Research Institute, Chengdu, Sichuan 610041, China

Received:2019-04-17 Revised:2019-07-21 Online:2020-04-11 Published:2020-07-01
Supported by:
This work was supported by the National Natural Science Foundation of China (51778475, 41472248) and the Department of Transportation of Sichuan Province (2016B2-4).

摘要/Abstract

摘要： 隧道冻胀力是引起隧道冻害的主要原因之一，隧道冻胀力主要由围岩不均匀冻胀引起。裂隙的存在会对岩体不均匀冻胀产生进一步影响，因此推导了岩体不均匀冻胀系数的计算公式，并获得岩体不均匀冻胀系数的相关规律。（1）岩体不均匀冻胀系数随裂隙与冻结方向的夹角? 的增大而增大。（2）温度梯度增加，岩体的不均匀冻胀系数增加，岩体的不均匀冻胀性增强。（3）裂隙率对岩体不均匀冻胀的影响需要考虑到裂隙与温度梯度夹角?，当裂隙与温度梯度的夹角? 较小时，岩体不均匀冻胀系数随裂隙率的增加而减小；当裂隙与温度梯度的夹角? 较大时，岩体不均匀冻胀系数随裂隙率的增加而增大。（4）裂隙对岩体不均匀冻胀的影响程度与岩体的岩性有关，裂隙对孔隙率小的岩体影响较大。根据推导的裂隙岩体不均匀冻胀系数计算公式，计算得到了不同岩性不同级别含裂隙围岩的不均匀冻胀系数范围，从而，在寒区隧道设计中可以更精确地计算隧道围岩作用于衬砌上的冻胀力，对寒区隧道工程的设计具有重要作用，对路基、边坡等寒区工程冻胀力的研究也可起到推动作用。

关键词: 岩体, 裂隙, 不均匀冻胀系数

Abstract: The frost heave force is one of the main reasons that induces the tunnel freezing damage. The frost heave force of tunnel is mainly caused by the differential frost heave of surrounding rock. The fracture will further affect the differential frost heave of rock mass. In this article, the calculation formulation for differential frost heave coefficient of rock mass is derived, and some findings concerning the coefficient of differential frost heave are drawn as follows. The differential frost heave coefficient increases with increasing the angle ? between fracture and temperature gradient. As temperature gradient rises, the differential frost heave coefficient increases. The influence of fracture ratio on differential frost heave of surrounding rock depends on the angle ? between fracture and temperature gradient. When ? is small, decreases with the increase of fracture ratio. When ? is large, increases with the increase of fracture ratio. The influence of fracture on differential frost heave of rock mass is related to the lithology of rock mass. The fracture has greater influence on the rock mass with smaller porosity. According to the calculation formula of differential frost heave coefficient of fissured rock mass, the range of differential frost heave coefficient of fissured rock mass with different lithology and different grades can be obtained. Therefore, in the design of tunnel in cold area, the frost heave force of tunnel surrounding rock acting on lining can be calculated more accurately, which plays an important role in the design of tunnel in cold area, and also promotes studies of the frost heave force of subgrade, slope and other projects in cold area.

Key words: rock mass, fracture, differential frost heave coefficient

中图分类号: TU 452

夏才初, 王岳嵩, 郑金龙, 吕志涛. 裂隙岩体不均匀冻胀性研究[J]. 岩土力学, 2020, 41(4): 1161-1168.

XIA Cai-chu, WANG Yue-song, ZHENG Jin-long, LÜ Zhi-tao. Study of differential frost heave of fractured rock mass[J]. Rock and Soil Mechanics, 2020, 41(4): 1161-1168.

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裂隙岩体不均匀冻胀性研究

Study of differential frost heave of fractured rock mass

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