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工程科学与技术:2018,50(2):67-76
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非均质断层破碎带注浆扩散机理
(山东大学 土建与水利学院, 山东 济南 250061)
Grouting Diffusion Mechanism in Heterogeneous Fault-fracture Zone
(School of Civil Eng.,Shandong Univ.,Ji'nan 250061,China)
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投稿时间:2017-05-31    修订日期:2018-01-08
中文摘要: 断层破碎带是诱发塌方、突泥等地质灾害的重要构造因素,但针对断层治理的注浆理论与技术研究进展缓慢。依托永莲隧道F2断层突水突泥灾害注浆治理工程,分析断层破碎带介质特点并划分介质类型,进而建立注浆概念模型;分别建立3种介质注浆控制方程研究3种类型介质条件下注浆扩散规律;通过注浆试验模拟非均质断层破碎带注浆扩散过程,基于浆脉分布情况与注浆压力、介质应力变化规律,分析了注浆扩散过程规律。结果表明:由于成分与密实度的差异,断层破碎带介质可分为松散型、软弱型与密实型3种介质,3种介质中浆液分别以渗透、压密、劈裂等扩散形式为主。易压缩且结构面数量较多的介质更利于浆液的扩散;密实型介质中劈裂扩散范围与介质结构面数量呈正相关,与压缩模量、注浆速率呈负相关。非均质断层破碎带注浆扩散过程可分为优势充填与劈裂扩散两个阶段,注浆压力变化曲线由缓慢上升至陡降的突跳点,即两阶段分隔点;优势充填阶段主要发生在松散型与软弱型介质中,注浆压力上升慢,浆液集中扩散;劈裂扩散阶段注浆压力上升较快,主要发生在密实型介质中。针对松散型与软弱型介质形成的不良地质区,提出定域注浆控制技术,并在永莲隧道突水突泥灾害治理工程中应用,取得了良好的注浆治理效果。
Abstract:The fault-fracture zone is an important tectonic factor for geological hazards such as cave-in and mud bursting.However,the research on grouting theory and technology of fault treatment develops slowly.Based on the treatment project of water-and-mud inrush hazard at F2 fault in yonglian tunnel,the property of rock mass medium in fault-fracture zone is analyzed,and a grouting conceptual model is established.The grouting control equations of three kinds of medium are built up,to analyze the influence of the rock mass property on the grouting process.Through the grouting test,the grouting process in heterogeneous fault-fracture zone is modeled,during which the diffusion process is analyzed,based on the distribution of slurry veins,variations of grouting pressure and the stress of media.The results show that the rock mass in heterogeneous fault-fracture zone can be classified into three kinds of medium,i.e.,incompact,compressible and compact media; while the slurry diffuses in different forms,i.e.,penetration in incompact media,consolidation in compressible media and split in compact media.In compact media,the grouting diffusion distance is positively related to the number of structural planes of rock mass,and negatively related to the compression modulus of rock mass as well as the grouting rate.According to the results of grouting test,the grouting diffusion process in heterogeneous fault-fracture zone can be divided into two stages,advantage filling and split grouting,and the transition point corresponds to the curve break of grouting pressure from creeping up to sharp down.The advantage filling stage,in which the slurry intensively diffuses and the grouting pressure increasing slowly,occurs mainly in compressible and compact media,while the split grouting stage,in which the grouting pressure rises faster,occurs mainly in incompact media.In order to effectively implement the advantage diffusion of slurry in the treatment process of unfavorable geologic bodies filled with incompact or compressible media,a grouting control technique is proposed,and applied to the treatment project of water-and-mud inrush hazard at F2 fault in yonglian tunnel.The technique was proved to have good grouting treatment effects.
文章编号:201700413     中图分类号:TU457    文献标志码:
基金项目:国家重点研发计划资助项目(2016YFC0801604)
作者简介:李相辉(1991-),男,博士生.研究方向:防灾减灾及防护工程.E-mail:1069898486@qq.com
引用文本:
李相辉,张庆松,张霄,蓝雄东,左金鑫.非均质断层破碎带注浆扩散机理[J].工程科学与技术,2018,50(2):67-76.
LI Xianghui,ZHANG Qingsong,ZHANG Xiao,LAN Xiongdong,ZUO Jinxin.Grouting Diffusion Mechanism in Heterogeneous Fault-fracture Zone[J].Advanced Engineering Sciences,2018,50(2):67-76.