考虑围岩孔隙特性的深部巷道注浆加固数值方法研究

金属矿山 ›› 2023, Vol. 52 ›› Issue (09): 12-23.

考虑围岩孔隙特性的深部巷道注浆加固数值方法研究

文旭东¹ 卢海峰^1,² 刘泉声^1,² 刘滨^3,⁴ 吴月秀^1,2

1. 武汉大学土木建筑工程学院,湖北武汉 430072;2. 岩土与结构工程安全湖北省重点实验室,湖北武汉 430072;3. 中国科学院武汉岩土力学研究所,湖北武汉 430071;4. 岩石力学与工程国家重点实验室,湖北武汉 430071

出版日期:2023-09-15 发布日期:2023-11-03
基金资助:
国家自然科学基金面上项目(编号:51974203,51574180)。

Numerical Method of Grouting Reinforcement in Deep Roadway Considering Pore Characteristics of Surrounding Rock

WEN Xudong¹ LU Haifeng^1,2 LIU Quansheng^1,2 LIU Bin^3,4 WU Yuexiu^1,2 #br#

1. School of Civil Engineering,Wuhan University,Wuhan 430072,China;2. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province,Wuhan 430072,China;3. Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;4. State Key Laboratory of Geomechanics and Geotechnical Engineering,Wuhan 430071,China

Online:2023-09-15 Published:2023-11-03

摘要/Abstract

摘要： 注浆加固可有效改善深部矿区裂隙发育的环境,保证巷道围岩稳定和矿区安全开采。以淮南矿区顾北煤矿泥岩巷道注浆加固工程为依托,通过注浆固结体微观结构扫描电镜试验和力学特性的试验研究,对围岩孔隙特性与注浆固结体力学特性的关系进行了研究,在此基础上对固结体的摩尔-库伦本构模型进行了修正,并基于 FLAC3D 软件,开发了考虑围岩孔隙特性的注浆加固评价的数值仿真分析方法,对矿区巷道群注浆加固效果进行了计算。结果表明:岩体孔隙率对注浆固结体的强度和变形特性影响较大,固结体的弹性模量和黏聚力与孔隙率存在对数递增关系,内摩擦角随孔隙率增大而减小;注浆固结体可存在包裹和搭接两种胶结模式;巷道群数值模拟结果显示,无注浆条件下巷道拱顶下沉位移、两帮收敛位移以及底鼓位移最为明显,随着注浆固结时间增加,各部分变形均趋于稳定,验证了该方法能很好地表征注浆加固效果。研究成果可为煤矿巷道注浆加固设计和施工提供分析评价方法。

关键词: 注浆加固, 注浆固结体, 力学特性, 本构模型, 数值仿真

Abstract: Grouting reinforcement can effectively improve the environment of fracture development in deep mining area, and ensure the stability of roadway surrounding rock and safe mining in mining area. Based on the grouting reinforcement project of mudstone roadway in Gubei Coal Area in Huainan Mining Area,the relationship between the pore characteristics of surrounding rock and the mechanical properties of grouting consolidation body was studied by scanning electron microscope test and mechanical properties test of grouting consolidation body. On this basis,the Mohr-Coulomb constitutive model of consolidation body was modified. Based on FLAC3D software,the numerical simulation analysis method of grouting reinforcement evaluation considering the pore characteristics of surrounding rock was developed,and the grouting reinforcement effect of roadway group in mining area was calculated. The results show that the porosity of rock mass has a great influence on the strength and deformation characteristics of grouting consolidation body. The elastic modulus and cohesion of the consolidation body are logarithmically increasing with the porosity,and the internal friction angle decreases with the increase of porosity. There are two cementation modes of wrapped and overlapped grouting consolidation body. The numerical simulation results of roadway group show that the subsidence displacement of tunnel vault,convergence displacement of two sides and floor heave displacement are the most obvious without grouting. With the increase of grouting consolidation time,the deformation of each part tends to be stable,which verifies that this method can well characterize the grouting reinforcement effect. The research results can provide analysis and evaluation methods for grouting reinforcement design and construction of coal mine roadway.

Key words: grouting reinforcement,grouting consolidation body,mechanical properties,constitutive model,numerical simulation

文旭东, 卢海峰, 刘泉声, 刘滨, 吴月秀. 考虑围岩孔隙特性的深部巷道注浆加固数值方法研究[J]. 金属矿山, 2023, 52(09): 12-23.

WEN Xudong, LU Haifeng, LIU Quansheng, LIU Bin, WU Yuexiu. Numerical Method of Grouting Reinforcement in Deep Roadway Considering Pore Characteristics of Surrounding Rock[J]. Metal Mine, 2023, 52(09): 12-23.

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