摘要
确定有效的帷幕注浆加固参数,可以降低隧道穿越富水软弱地层遭遇突水突泥灾害的风险。通过室内注浆试验,研究了不同注浆量下的风化花岗岩堵水加固特性。试验结果表明:注浆量(浆液充填率,GFR)达到32%以上时,试样的物理力学特性显著改善,其中黏聚力较未注浆时增长了2.96倍,达到178.8 kPa,渗透系数下降至10^(-8)cm/s以下。考虑风化花岗岩中浆液扩散模式以劈裂和挤密扩散为主,不符合室内注浆的均匀特性。因此基于安全考虑,建议注浆量应达到48%以上,并采用COMSOL多场耦合数值仿真系统开展帷幕注浆参数研究。研究结果表明:帷幕注浆加固圈的渗透率降低1个数量级时,注浆圈厚度取5~6 m,堵水效果最为经济可行,建立的帷幕注浆量与加固圈厚度可为类似工程提供借鉴。
In order to reduce the risk of water and mud inrush during the tunnel crosses water-rich soft weathered rock stratum,the effective curtain grouting parameters are determined.The characteristics of blocking water and strengthen by weathered granite are This paper investigated the grouting volume for the curtain grouting by conducting a series of tests,including strength and permeability tests.The test results indicate that the physical properties can be improved significantly when the grouting filling ratio(GFR)reached 32%.The cohesion which is 178.8 kPa increased2.96 times than the original granite.The permeability dropped three to 10^(-8)cm/s.Considering splitting and compaction diffusion was the main slurry diffusion types of weathered granite,which is not conformity to uniformity in laboratory test.Therefore,the GFR of 48%is suggested for safety.Furthermore,the curtain grouting parameters are studied by multi coupled numerical simulations of COMSOL.The calculation results show that the effect of blocking water is the most economically feasible when the grouting thickness is 5-6 m and the permeability index drops 1/10-1/20 and can provide reference for similar engineering.
作者
王松
周勇
杨涛
刘晨
梁超恒
曾冠铭
黄发明
Wang Song;Zhou Yong;Yang Tao;Liu Chen;Liang Chaoheng;Zeng Guanming;Huang Faming(China Construction Eighth Engineering Bureau Co.,Ltd.,Shanghai 200000,China;South Company of China Construction Eighth Engineering Bureau Co.,Ltd.,Nanning 530022,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)
出处
《市政技术》
2022年第3期96-101,114,共7页
Journal of Municipal Technology
基金
国家自然科学青年基金(4180728)
中建八局南方公司科研课题《溶蚀峰丛谷地地貌隧道溶洞处理关键施工技术研究与应用》。
关键词
全强风化花岗岩
隧道突水突泥
室内试验
注浆量
注浆厚度
completely highly weathered granite
tunnel water and mud inrush
laboratory test
grouting volume
grouting thickness
