Study on the freeze-thaw deformation characteristics 
of saturated fractured rocks

JIA Peng; WANG Xiao-shuai; WANG De-chao

doi:10.16285/j.rsm.2022.0554

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Study on the freeze-thaw deformation characteristics of saturated fractured rocks

更新时间：2026-06-25

- Study on the freeze-thaw deformation characteristics of saturated fractured rocks
- Vol. 44, Issue 2, Pages: 345-354(2023)
- 作者机构：
  
  东北大学资源与土木工程学院,辽宁,沈阳,110819
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.0554
  CLC： TU45
- Online First：17 February 2023，
  
  Published：2023
- 稿件说明：
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JIA Peng, WANG Xiao-shuai, WANG De-chao. Study on the freeze-thaw deformation characteristics of saturated fractured rocks[J]. 2023, 44(2): 345-354.
DOI：

JIA Peng, WANG Xiao-shuai, WANG De-chao. Study on the freeze-thaw deformation characteristics of saturated fractured rocks[J]. 2023, 44(2): 345-354. DOI： 10.16285/j.rsm.2022.0554.

摘要

寒区岩体在裂隙水冻胀作用的影响下发生损伤劣化，严重威胁寒区工程建设安全。针对孔隙率不同的绿砂岩、红砂岩和花岗岩开展了饱水裂隙岩石的冻融循环试验，分析了不同裂隙长度、裂隙宽度和岩性的岩石在冻融循环过程中随时间和温度变化的变形规律，得到了饱水裂隙岩石冻融变形特征值的变化特征，探究裂隙长度、裂隙宽度及岩性对冻融应变特征值的影响，分析了裂隙岩石冻融变形特性和破坏机制。试验结果表明：（1）不同裂隙几何参数岩石冻融应变变化过程可分为7个阶段：冷缩阶段、冻胀阶段、冻胀趋稳阶段、热胀阶段、融缩阶段、融缩回弹阶段和融缩趋稳阶段；（2）饱水裂隙岩石冻融应变随温度变化的曲线为不能闭合的滞回环，出现“冻融滞回”现象，且随冻融次数增加，滞回环逐渐上移，残余应变逐渐增加；（3）饱水裂隙岩石冻融应变特征值包括最大应变、残余应变、冻胀幅值和融缩幅值，且应变特征值与裂隙长度、裂隙宽度和岩体岩性相关，裂隙岩石冻融破坏是残余应变逐渐累积的过程。

Abstract

The fractured rock mass in cold areas is damaged and deteriorated due to crevice-water frost heaving

which seriously threatens the safety of engineering construction in cold regions. In this study

freeze-thaw cycling tests were conducted on green sandstone

red sandstone and granite samples of different porosities. The strain changing with time and temperature of saturated fracture during freeze-thaw cycling under influences of fracture length

width and lithology were analyzed. The changing rules of the characteristic values of fracture strains and the failure mechanism of fractured rock were also studied. Experimental results show that the change rule of freeze-thaw strain of fractured rock mass with different fracture geometry parameters can be divided into seven stages: the cool shrinkage stage

the frost heave stage

the frost heave stabilization stage

the thermal expansion stage

the thaw shrinkage stage

the thaw shrinkage rebound stage

and the thaw shrinkage stabilization stage. The curve of freeze-thaw strain versus temperature of saturated fractured rock mass is an unclosed hysteresis loop. The phenomenon of “freeze-thaw hysteresis” occurs

and with the increase of freeze-thaw cycles

the hysteresis loop gradually moves up

leading to a gradual increase of the residual strain. Characteristic values of freeze-thaw strain of saturated fractured rock mass include: the maximum microstrain

the residual strain

the frost heave amplitude

and the thaw shrinkage amplitude. The characteristic value of strain is related to the fracture length

the width and lithology of rock mass

and the freeze-thaw failure of fractured rock mass is caused by gradual accumulation of the residual strain.

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