Study of differential frost heave of fractured rock mass

XIA Cai-chu; WANG Yue-song; ZHENG Jin-long; LÜ Zhi-tao

doi:10.16285/j.rsm.2019.0699

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Study of differential frost heave of fractured rock mass

更新时间：2026-06-25

- Study of differential frost heave of fractured rock mass
- Vol. 41, Issue 4, Pages: 1161-1168(2020)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.0699
  CLC： U457
- Online First：01 July 2020，
  
  Published：2020
- 稿件说明：
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XIA Cai-chu, WANG Yue-song, ZHENG Jin-long, et al. Study of differential frost heave of fractured rock mass[J]. 2020, 41(4): 1161-1168.
DOI：

XIA Cai-chu, WANG Yue-song, ZHENG Jin-long, et al. Study of differential frost heave of fractured rock mass[J]. 2020, 41(4): 1161-1168. DOI： 10.16285/j.rsm.2019.0699.

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。

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.

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