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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • 创刊于1988年
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采选技术与矿山管理

应力—渗流耦合作用下损伤岩石渗流特性

  • 胡建华 ,
  • 董喆喆 ,
  • 马少维 ,
  • 秦亚光 ,
  • 徐晓 ,
  • 代转
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  • 中南大学资源与安全工程学院,湖南 长沙 410083
胡建华(1975-),男,湖南衡南人,教授,从事高效安全采矿技术与工程稳定性研究工作。hujh21@126.com

收稿日期: 2020-11-29

  修回日期: 2021-03-08

  网络出版日期: 2021-07-14

基金资助

国家自然科学基金项目“深部采动下地质结构体跨尺度时变力学行为试验及机理”(41672298);国家“十三五”重点研发计划课题“深部大矿段多采场时空协同采矿理论与技术”(2017YFC0602901)

Seepage Characteristics of Damaged Rock Under Stress-Seepage Coupling

  • Jianhua HU ,
  • Zhezhe DONG ,
  • Shaowei MA ,
  • Yaguang QIN ,
  • Xiao XU ,
  • Zhuan Dai
Expand
  • School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China

Received date: 2020-11-29

  Revised date: 2021-03-08

  Online published: 2021-07-14

摘要

地下矿产资源开采过程中,频繁的应力扰动会对深部硬岩造成一定的损伤。硬岩内部孔隙和裂隙在高地应力和高渗透压的状态下迅速扩展贯通,严重威胁岩体工程的安全和稳定性。针对损伤花岗岩开展了一系列应力—渗流耦合试验,结合CT扫描,考虑渗透压、围压和损伤程度等因素的影响,综合分析了损伤岩石在应力—渗流耦合作用下的力学和渗流特性。试验结果表明:随着损伤程度的增加,岩样孔隙及裂隙体积呈现出从平缓增加、稳步增加到急剧增加的变化趋势;在围压相同的情况下,岩样的峰值强度随着渗透压的增加呈线性减小,渗透压对损伤花岗岩的强度具有明显的弱化效应,且弱化程度与围压无关;损伤程度越大,裂隙发育程度越高,渗透率越大,同时,孔隙及裂隙的发育程度可用于表征渗透率的大小。

本文引用格式

胡建华 , 董喆喆 , 马少维 , 秦亚光 , 徐晓 , 代转 . 应力—渗流耦合作用下损伤岩石渗流特性[J]. 黄金科学技术, 2021 , 29(3) : 355 -363 . DOI: 10.11872/j.issn.1005-2518.2021.03.204

Abstract

During the mining of underground mineral resources,the deep hard rock will be damaged by the frequent stress disturbances.Its internal pores and fissures will rapidly expand and penetrate under the state of high ground stress and high osmotic pressure,which seriously threatens the safety and stability of rock mass engineering.The damage degree D is defined by the ratio of axial stress σ to compressive strength σc.Pre-damaged rock samples with different damage degrees (0%,25%,40%,50%,65%,75%,100%) were prepared by uniaxial compression test.A series of stress-seepage coupling tests were carried out for 75% damaged granite.Combined with CT scanning,considering the influence of seepage pressure,confining pressure and damage degree,the mechanical and seepage characteristics of damaged rock under stress-seepage coupling was comprehensive analyzed.The research results show that with the increase of damage degree,the number and size of pore and fracture of rock sample increase significantly,and changes of the volume of pore and fracture of rock sample shows a trend of increase gently and increase steadily to increase sharply.Under the same confining pressure,the peak strength of the rock sample shows a linear decrease with the increase of osmotic pressure,the osmotic pressure has a significant weakening effect on the strength of damaged granite,and the degree of weakening is independent of the confining pressure.The permeability of pre-damaged rock samples is closely related to the volume of pores and fractures.The variation trend of permeability with damage percentage confirms the evolution law of pores in different development stages.The greater the degree of damage,the higher the degree of fracture development and the greater the permeability.At the same time,the permeability can be characterized by the degree of development of pores and fractures.With the same degree of fracture development,the greater the confining pressure,the smaller the permeability.

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