冻融作用下裂隙类砂岩断裂特征与强度损失研究

doi:10.16285/j.rsm.2018.0743

岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 62-71.doi: 10.16285/j.rsm.2018.0743

冻融作用下裂隙类砂岩断裂特征与强度损失研究

刘艳章^{1, 2}，郭赟林¹，黄诗冰^{1, 2}，蔡原田¹，李凯兵¹，王刘宝¹，李伟¹

1. 武汉科技大学资源与环境工程学院，湖北武汉 430081； 2. 武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室，湖北武汉 430081

收稿日期:2018-04-27 出版日期:2018-12-21 发布日期:2019-01-02
通讯作者: 黄诗冰，男，1989年生，博士，副教授，主要从事岩石力学与矿业工程方面的教学与研究工作。E-mail: huang1989.9@163.com E-mail:liuyanzhang@163.com
作者简介:刘艳章，男，1969年生，博士，教授，主要从事岩石力学与矿业工程方面的教学与研究工作
基金资助:
国家自然科学基金青年基金(No. 41702291) ；湖北省自然科学基金项目(No. 2015CFA142)

Study of fracture characteristics and strength loss of crack quasi-sandstone under freeze-thaw cycles

LIU Yan-zhang^1,2, GUO Yun-lin¹, HUANG Shi-bing^1,2, CAI Yuan-tian¹, LI Kai-bing¹, WANG Liu-bao¹, LI Wei¹

1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China; 2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China

Received:2018-04-27 Online:2018-12-21 Published:2019-01-02
Supported by:
This work was supported by the Young Foundation of the National Natural Science Foundation of China (41702291) and the Natural Science Foundation of Hubei Province (2015CFA142).

摘要/Abstract

摘要： 寒区裂隙岩体中经常发生水冰相变产生冻胀力，冻胀力的反复作用会驱动岩体裂隙扩展、贯通甚至断裂破坏。通过在类砂岩试样中预制不同倾角的单开口裂隙，分别进行预冷和不预冷饱水裂隙冻融循环试验及冻融后的单轴压缩试验，探究冻结方式和裂隙倾角对裂隙冻胀扩展过程、断裂破坏特征及单轴强度的影响机制。试验结果表明，裂隙冻胀力是驱使裂隙冻融扩展的主要动力且与裂隙水的冻结方式密切相关，采用预冷方式冻结会引起绝大部分裂隙水挤出而难以形成冻胀裂纹；在非预冷冻结方式下冻胀裂纹一般先沿着预制裂隙共面方向扩展，但由于边界效应而逐渐转向短边，共面扩展长度与裂隙倾角呈正相关；当预制裂隙倾角在60°～90°时，岩体容易沿着冻胀裂纹方向发生压缩破坏，从而引起岩体单轴抗压强度降低。研究结果可为揭示裂隙岩体冻融损伤机制及开展寒区岩体工程建设提供借鉴。

关键词: 裂隙岩体, 水-冰相变, 冻胀扩展, 断裂特征, 强度损失

Abstract: Water-ice phase transition often produces frost heaving pressure in fractured rock mass in cold regions. The repeated action of frost heaving pressure will drive crack propagation, coalescence and even fracture failure of rock mass. Through prefabrication of single open crack with different inclination angles in quasi-sandstone specimens, freeze-thaw and uniaxial compression experiments are conducted on those crack-containing specimens under precooling and non-precooling conditions, to investigate the influence of freezing mode and crack inclination angle on the process of frost propagation, rupture characteristics and uniaxial compressive strength. The experimental results show that: the frost heaving pressure is the main driving force of frost propagation, which is closely related to the freezing mode of crack water. It is hard to produce frost-heaving cracks under precooling conditions, because most of the crack water is squeezed out. Generally, the frost-heaving cracks propagate along the coplanar direction of the prefabricated cracks; and then they gradually turn to the short sides due to the boundary effect. There is a positive correlation between the length of coplanar propagation and the inclination angle of crack. When the prefabricated crack inclination angle is 60°-90°, the rock mass can easily be compressed and destroyed along the direction of frost-heaving crack, resulting in the reduction of uniaxial compressive strength of rock mass. The research results can provide reference for revealing the freeze-thaw damage mechanism of fractured rock mass and developing rock engineering in cold regions.

Key words: fractured rock mass, water-ice phase transition, frost-heaving expansion, fracture characteristics, strength loss

中图分类号:

TU 452

刘艳章, 郭赟林, 黄诗冰, 蔡原田, 李凯兵, 王刘宝, 李伟, . 冻融作用下裂隙类砂岩断裂特征与强度损失研究[J]. 岩土力学, 2018, 39(S2): 62-71.

LIU Yan-zhang, GUO Yun-lin , HUANG Shi-bing , CAI Yuan-tian , LI Kai-bing , WANG Liu-bao , LI Wei , . Study of fracture characteristics and strength loss of crack quasi-sandstone under freeze-thaw cycles[J]. Rock and Soil Mechanics, 2018, 39(S2): 62-71.

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冻融作用下裂隙类砂岩断裂特征与强度损失研究

Study of fracture characteristics and strength loss of crack quasi-sandstone under freeze-thaw cycles

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