摘要
以某地下水封洞库为背景,针对工程区内导水构造发育引起的洞室渗涌水问题,引入帷幕灌浆技术进行封堵,并通过现场试验和数值模拟等手段研究帷幕灌浆对岩体渗透性的影响规律及其在洞库工程中的渗控效果。结果表明:帷幕灌浆分序实施过程中,经Ⅰ序孔灌浆后,Ⅱ序孔部位岩体的渗透性减弱,灌前透水率和单位耗灰量的分序递减规律较好。岩体渗透性较大时,其可灌性好、耗灰量大,在Ⅱ序孔灌浆时透水率和单位耗灰量降低明显,岩体降渗效果较显著。帷幕灌浆Ⅰ序孔的灌前透水率与灌浆孔段埋深有关,在爆破影响范围以外,应适当提高灌浆压力,增大耗灰量,达到更好的灌浆效果。渗流场分析揭示防渗帷幕对于降低灌浆范围内导水构造的渗透性具有积极作用,可以部分截断天然地下水沿主要导水构造向洞室内渗漏,在一定程度上控制洞室整体渗水量。
Based on the background of an underground water-sealed cavern,curtain grouting technology was introduced to seal the cavern due to the water seepage caused by the development of water-conducting structure in the engineering area.The influence of curtain grouting on the permeability of rock mass and its seepage control effect in the cavern project were studied by means of field tests and numerical simulation.The results showed that during the implementation of curtain grouting in sequence,afterⅠ-holes grouting,the permeability of the rock mass at theⅡ-holes was weakened,and the hydraulic conductivity before grouting and unit ash consumption had a better law of decreasing in sequence.When the permeability of the rock mass was large,it had good groutability and large ash consumption,the hydraulic conductivity and unit ash consumption decreased obviously during grouting inⅡ-holes,and the permeability reduction effect of grouting was also more significant.The hydraulic conductivity ofⅠ-holes in curtain grouting was related to the burial depth of the grouting hole section.Outside the scope of blasting influence,grouting pressure should be increased appropriately to increase ash consumption,and better grouting results may be achieved.The seepage field analysis revealed that the anti-seepage curtain had a positive effect on reducing the permeability of the water-conducting structure within the grouting range,which could partially cut off the seepage of the natural groundwater along the main water-conducting structures into the cavern,and then played a role in controlling the overall water inflow in the cavern to a certain extent.
作者
丁长栋
张宜虎
李领
罗荣
范雷
丁祥
曹磊
DING Changdong;ZHANG Yihu;LI Ling;LUO Rong;FAN Lei;DING Xiang;CAO Lei(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,Hubei,China;First Engineering Bureau Co.,Ltd.,China Anneng Construction Group,Nanning 530221,Guangxi,China;School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,Hubei,China)
出处
《隧道与地下工程灾害防治》
2024年第1期64-72,共9页
Hazard Control in Tunnelling and Underground Engineering
基金
国家自然科学基金资助项目(52309123)
中央级公益性科研院所基本科研业务费资助项目(CKSF2023310/YT
CKSF2023319/YT)
关键词
地下水封洞库
帷幕灌浆
渗流场控制
导水构造
渗控效果
underground water-sealed oil storage
curtain grouting
seepage control
water-conducting structure
seepage control effect
