破碎岩体注浆加固后的承载特性与能量演化

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中文摘要：为探究破碎岩体注浆加固对其承载特性的影响，对不同粒径、岩性的注浆结石体进行单双轴压缩试验，研究其力学特性及能量演化机制，并采用能量耗散比k及峰后应力跌落速率AV评价注浆结石体承载的稳定性。结果表明，相比单轴加载，双轴加载下花岗岩结石体(GRM)的强度及延展性高于砂岩结石体(SRM);在单双轴加载下，注浆结石体的能量演化特征主要分为初期、中期及后期三个阶段，初期注浆结石体总能量W、弹性能WE及耗散能WD较小，曲线较为平缓;中期WE迅速增加，WD缓慢增加;后期耗散能WD急剧增加;注浆结石体容纳变形能力与k、AV有关，单轴加载下，k随粒径增大而增大，峰前塑性变形范围增大，而AV随粒径增大而减小，峰后容纳变形的能力增大，承载能力提高;双轴加载下，k随粒径增大而减小，峰前塑性变形范围缩小，AV随粒径增大而增大，峰后容纳变形的能力降低，承载能力降低。本研究结果对不同岩性注浆提高巷道围岩稳定性具有一定的指导意义。

外文标题：Load-bearing characteristics and energy evolution of fractured rock masses after granite and sandstone grouting

外文摘要：Experiments on grouting-reinforced rock mass specimens with different particle sizes and features were carried out in this study to examine the effects of grouting reinforcement on the load-bearing characteristics of fractured rock mass.The strength and deformation features of grouting-reinforced rock mass were analyzed under different loading manners;the energy evolution mechanism of grouting-reinforced rock mass specimens with different particle sizes and features was investigated;the energy dissipation ratio and post-peak stress decreasing rate were employed to evaluate the bearing stability of grouting-reinforced rock mass.The results show that the strength and ductility of granite-reinforced rock mass(GRM)under biaxial loading are higher than that of sandstone-reinforced rock mass(SRM)under uniaxial loading.Besides,the energy evolution characteristics of grouting-reinforced rock mass under uniaxial and biaxial loading mainly could be divided into early,middle,and late stages.In the early stage,total,elastic,and dissipation energies were quite small with flatter curves;in the middle stage,elastic energy increased rapidly,whereas dissipation energy increased slowly;in the late stage,dissipation energy increased sharply.The energy dissipation ratio was used to represent the pre-peak plastic deformation.Under uniaxial loading,this ratio increased as the particle size increased and the pre-peak plastic deformation of grouting-reinforced rock mass became larger;under biaxial loading,it dropped as the particle size increased,and the pre-peak plastic deformation of grouting-reinforced rock mass became smaller.The post-peak stress decline rate AV was used to assess the post-peak bearing performance of grouting-reinforced rock mass.Under uniaxial loading,parameter AV exhibited reduction as the particle size kept increasing,and the ability of post-peak of grouting-reinforced rock mass to allow deformation development was greater,and the bearing capacity was greater;under biaxial loading,AV increased with the particle size,and the ability of post-peak of grouting-reinforced rock mass to allow deformation development was low and the bearing capacity was reduced.The findings are considered instrumental in improving the stability of the roadway-surrounding rock by granite and sandstone grouting.

外文关键词：

grouting-reinforced rock massparticle sizeenergy dissipation ratiopost-peak stress decreasing rateload-bearing characteristics

作者：

吴旭坤、赵光明、孟祥瑞、刘崇岩、刘之喜、黄顺杰、张启航

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作者单位：

Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China

National Key Laboratory of Safe Mining of Deep Coal and Environmental Protection,Anhui University of Science and Technology,Huainan 232001,China

Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining,Anhui University of Science and Technology,Huainan 232001,China

关键词：

注浆结石体粒径大小能量耗散比峰后应力跌落速率承载特性

基金：

National Key Research and Development Program of ChinaMajor Science and Technology Projects of Anhui Province,ChinaNational Talent Project,ChinaLeading Talent Project of the Special Support Plan of Anhui Province,ChinaUniversity Synergy Innovation Program of Anhui Province,ChinaExcellent Scientific Research and Innovation Team of Universities in Anhui Province,ChinaAnhui University of Science and Technology Postgraduate Innovation Fund Project,China

项目编号：

2023YFC2907600202203a07020011T2021137T000508GXXT-2021-0752022AH0 100532022CX 1004

出版年：

2024

DOI：

10.1007/s11771-024-5760-y

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDEI

影响因子：0.47

ISSN：2095-2899

年,卷(期)：2024.31(8)