Study on the simulation method and mesoscopic characteristics of rock freeze-thaw damage

被引：45

作者：

Feng, Qiang ^{[1
]}

Hou, Shaojie ^{[1
]}

Liu, Weiwei ^{[1
]}

Zhang, Shuang ^{[1
]}

Li, Wenshuai ^{[1
]}

Tian, Maolin ^{[1
]}

机构：

[1] Shandong Univ Sci & Technol, Sch Civil Engn & Architecture, Shandong Key Lab Civil Engn Disaster Prevent & Mit, Qingdao 266590, Peoples R China

来源：

COMPUTERS AND GEOTECHNICS | 2023年 / 153卷

关键词：

CT scanning test; Freeze-thaw cycle; Frost heaving coefficient; Melting coefficient; Numerical simulation method; Damage characteristics; CT;

D O I：

10.1016/j.compgeo.2022.105038

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

The damage to saturated rock caused by freeze-thaw cycles seriously affects the stability of projects in cold regions. To accurately obtain the mechanical characteristics of rock after freeze-thaw damage, this paper ex-tracts the microscopic pore structure parameters of freeze-thaw sandstone based on CT scanning tests. Functional relationships between the number of freeze-thaw cycles and both the frost heaving coefficient and thawing coefficient of pore particles are established, and a new method to simulate the mechanical behavior of freezing -thawing rock is proposed based on PFC3D. The CT test results show that the freeze-thaw cycle causes a certain degree of damage to the mesopore structure of sandstone. The sensitivity of each pore structure parameter to characterize the damage is pore volume > effective porosity > porosity > pore radius > fractal dimension > throat length > throat radius > coordination number. Numerical simulation results show that with the increase in the number of freeze-thaw cycles, the internal damage degree of sandstone is more obvious, and the bearing capacity declines. In addition, the rock mainly produces tensile cracks during the freeze-thaw cycle, and failure occurs first outside the rock. The research results reveal the freeze-thaw damage mechanism of rock more accurately.

引用

页数：22

共 26 条

[21]

Yandong Liu, 2014, Advanced Materials Research, V960-961, P82, DOI 10.4028/www.scientific.net/AMR.960-961.82

[22]

Zhang H., 2021, Mech. Eng., V43, P687

[23] The characterization of bituminous coal microstructure and permeability by liquid nitrogen fracturing based on μCT technology [J].

Zhang, Lei ;

Chen, Shuai ;

Zhang, Cun ;

Fang, Xinqiu ;

Li, Shuang .

FUEL, 2020, 262

[24] Study on the damage propagation of surrounding rock from a cold-region tunnel under freeze-thaw cycle condition [J].

Zhang, SJ ;

Lai, YM ;

Zhang, XF ;

Pu, YB ;

Yu, WB .

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2004, 19 (03) :295-302

[25] Damage mechanism of soil-rock mixture after freeze-thaw cycles [J].

Zhou Zhong ;

Xing Kai ;

Yang Hao ;

Wang Hao .

JOURNAL OF CENTRAL SOUTH UNIVERSITY, 2019, 26 (01) :13-24

[26] A DEM-Based Approach for Modeling the Damage of Rock Under Freeze-Thaw Cycles [J].

Zhu, Tantan ;

Chen, Jianxun ;

Huang, Da ;

Luo, Yanbin ;

Li, Yao ;

Xu, Longfei .

ROCK MECHANICS AND ROCK ENGINEERING, 2021, 54 (06) :2843-2858

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