Study of differential frost heave of fractured rock mass

被引：0
|
作者：
Xia Cai-Chu [1 ,2 ]
Wang Yue-song [1 ,2 ]
Zheng Jin-long [3 ]
Lu Zhi-tao [1 ,2 ]
机构：
[1] Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
[2] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China
[3] Sichuan Prov Transport Dept Highway Planning Surv, Chengdu 610041, Sichuan, Peoples R China
来源：
ROCK AND SOIL MECHANICS | 2020年 / 41卷 / 04期
基金：
中国国家自然科学基金;
关键词：
rock mass; fracture; differential frost heave coefficient;
D O I：
10.16285/j.rsm.2019.0699
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
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 k(theta) of rock mass is derived, and some findings concerning the coefficient of differential frost heave k(theta) are drawn as follows. The differential frost heave coefficient increases with increasing the angle theta 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 theta between fracture and temperature gradient. When theta is small, k(theta )decreases with the increase of fracture ratio. When theta is large, k(theta )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.
引用
收藏
页码：1161 / 1168
页数：8
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