全风化花岗岩加固特性注浆模拟试验

发布时间：2018-02-27 10:42

本文关键词： 全风化花岗岩注浆模拟试验注浆压力水稳定性注浆效果　出处：《天津大学学报(自然科学与工程技术版)》2017年11期 　论文类型：期刊论文

【摘要】：针对全风化花岗岩自稳能力差、遇水极易软化崩解等特点,依托广西均昌隧道帷幕注浆灾害治理工程,设计全风化花岗岩注浆模拟试验,通过改变注浆压力,对被注介质单轴抗压强度、抗剪强度、渗透系数、崩解率等参数进行测定,研究注浆对全风化花岗岩地层强度特性和水理特性的影响机制.试验结果表明:全风化花岗岩地层中,注浆以劈裂模式为主;随着注浆压力的提高,主浆脉扩展厚度不断提高,被注介质的劈裂区(含浆脉)及压密区(不含浆脉)的单轴抗压强度和抗剪强度均显著增长;在注浆压力为2.0,MPa时,劈裂区抗压强度提高了152.4%,,抗剪强度(σ_n=200 kPa)提高了348.6%,,压密区抗压强度提升71.4%,,抗剪强度(σ_n=400 kPa)提升了149.6%,;注浆加固后被注介质渗透系数大幅降低,水稳定性显著提高.
[Abstract]:In view of the poor self-stability ability of fully weathered granite and its easy to soften and disintegrate when it comes to water, relying on the curtain grouting disaster control project of Junchang Tunnel in Guangxi, the simulation test of grouting of fully weathered granite is designed, and the grouting pressure is changed. The uniaxial compressive strength, shear strength, permeability coefficient and disintegration rate of the injected medium were measured. The influence mechanism of grouting on the strength and hydrological characteristics of weathered granite strata is studied. The experimental results show that in the weathered granite strata, the grouting mode is mainly split, and with the increase of grouting pressure, the extension thickness of main veins increases continuously. The uniaxial compressive strength and shear strength of the split zone (containing pulps) and the compaction zone (without pulps) of the injected medium increased significantly, and when the grouting pressure was 2.0 MPA, the uniaxial compressive strength and shear strength of the injected medium increased significantly. The compressive strength of split area is increased by 152.4%, the shear strength (蟽 n ~ (200) KPA) is increased by 348.6%, the compressive strength of compaction zone is increased by 71.4 and the shear strength (蟽 n ~ (400) KPA) is increased by 149.60.After grouting, the permeability coefficient of injected medium decreases significantly, and the water stability is improved significantly.
【作者单位】：山东大学岩土与结构工程研究中心;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC0801604) 国家自然科学基金青年科学基金资助项目(51509146)~~
【分类号】：U451.5;U457.3

【相似文献】