Research on Deformation and Fracture Characteristics of the Fractured Rock Mass Under Coupling of Heavy Rainfall Infiltration and Mining Unloading

被引:4
|
作者
Wang, Menglai [1 ,2 ]
Li, Xiaoshuang [3 ,4 ,5 ]
Yang, Shun [2 ,6 ]
Teng, Lin [5 ]
Chen, Qiusong [7 ]
Jiang, Song [8 ]
机构
[1] Yunnan Phosphating Grp Co LTD, Kunming, Yunnan, Peoples R China
[2] Chongqing Univ, Sch Resources & Safety Engn, Chongqing, Peoples R China
[3] Sinosteel Maanshan Gen Inst Min Res Co LTD, State Key Lab Safety & Hlth Met Mines, Maanshan, Peoples R China
[4] Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Peoples R China
[5] Qilu Inst Technol, Coll Civil Engn, Jinan, Peoples R China
[6] Jiangxi Univ Sci & Technol, Sch Resources & Environm Engn, Ganzhou, Peoples R China
[7] Cent South Univ, Sch Resources & Safety Engn, Changsha, Peoples R China
[8] Xian Univ Architecture & Technol, Sch Resources Engn, Xian, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
rainfall infiltration; mining unloading; fractured rock mass; fracture propagation characteristics; numerical simulation; OF-THE-ART; DAMAGE; PREDICTION; CRACK; MODEL; FLOW;
D O I
10.3389/feart.2021.792038
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The present study used PFC numerical software to examine the mechanical properties and fracture propagation characteristics of the fractured rock mass under coupling of heavy rainfall infiltration and mining unloading. Based on the engineering background of the Dexing mine, the pore water pressure is set to 0, 0.5, 1.0, 1.5, and 2.0 mpa, the true triaxial lateral unloading rate is 0.3 mpa/level and 0.6 mpa/level, and the water content state of rock is dry, natural, and saturated. Then, the true triaxial compression numerical simulation test is carried out, and the results showed that with the increase of the water content, the rock compaction stage increases, the elastic stage shortens, and the yield stage becomes more obvious. The faster the unloading rate is, the greater the influence on the rock strain is. After unloading, the stress jump point appears and the strain increase rate becomes larger, the volume of the rock increases and occurs as large s in the unloading direction, and finally it leads to severe brittle failure of the rock. With the increase of rock pore water pressure, the compressive strength and the peak strain of the rock decrease, and the pore water pressure accelerates the process of rock failure.
引用
收藏
页数:15
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