摘要
引水隧洞穿越积水煤层段施工风险大,设计施工过程中通常结合现场渗流程度采取一定的防渗措施,控制时效性较差。为提升注浆防渗措施设计参数的适用性,本文依托重庆市渝西水资源配置工程黄瓜山隧洞,基于渗流—损伤耦合模型,选取不同注浆层厚度进行渗流控制效果及影响行为的研究分析。结果表明:在进行隧道渗流场分析过程中,围岩渗透系数较小时考虑围岩损伤十分必要;相较于不采取防渗措施,采取注浆措施后围岩孔隙水压力场分布的影响明显,衬砌外侧孔隙水压力有所降低且注浆层厚度3 m时控制效果最好;随着注浆层厚度的增加,衬砌应力逐渐增加,应力平面分布均匀性也有所提升;注浆层厚度不大于5 m时各方向上的收敛变形更加均匀;注浆层厚度不宜过大,对于本工程注浆层厚度不宜大于5 m。研究成果可为同类工程注浆防渗措施的设计提供参考。
The construction risk of the water diversion tunnel through the water-logging coal seam section is high.The design and construction process are usually combined with the site seepage degree to take different antiseepage measures,and the control timeliness is poor.To enhance the applicability of design parameters of grouting anti-seepage measures,this paper relies on the Huanguashan Tunnel of Chongqing Yuxi Water Resources Allocation Project.Based on the Seepage flow-damage coupling model,different grouting layer thicknesses have been selected for the research and analysis of seepage control effect and influence behavior.The following conclusions were drawn.In the process of tunnel seepage field analysis,it is necessary to take into account the damage to the surrounding rock when the permeability coefficient is small.The effect of the pore water pressure field distribution in the surrounding rock after taking grouting measures is obvious compared with not taking anti-seepage measures.The pore water pressure on the outer side of the liner is reduced and the best control effect is achieved when the thickness of the grouting layer is 3 m.With the increase of grouting layer thickness,the lining stress gradually increases and the uniformity of stress plane distribution is improved.The convergence deformation is more uniform when the thickness of the grouting layer is not more than 5 m.The thickness of the grouting layer should not be too large.For this project,the thickness of the grout layer should not be greater than 5 m.The research results can provide reference for the design of grouting and seepage control measures for similar projects.
作者
刘鹏
唐思勤
陈征
Liu Peng;Tang Siqin;Chen Zheng(Power China Road Bridge Group Co.,Ltd,Beijing 100048,P.R.China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第S02期852-858,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(52074048)
重庆市水利科技项目(CQSLK-2022007)
关键词
积水煤层
引水隧洞
注浆措施
渗流场
影响行为
water-logging coal seam
water diversion tunnel
grouting measure
seepage field
influence behavior
