西部含水弱胶结围岩-充填层-钻井井壁流固耦合作用机理分析  

Analysis of fluid-solid coupling mechanism of water-bearing weakly cemented surrounding rock-filling layer-drilling shaft lining in the west of China

作　　者：姚直书[1,2] 李欣慰 程桦[1,2,3] 黄献文 方玉 王晨 YAO Zhishu;LI Xinwei;CHENG Hua;HUANG Xianwen;FANG Yu;WANG Chen(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Research Center of Mine Underground Engineering of Ministry of Education,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Resources and Environmental Engineering,Anhui University,Hefei,Anhui 230022,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001 [3]安徽大学资源与环境工程学院,安徽合肥230022

出　　处：《采矿与安全工程学报》2023年第6期1177-1190,共14页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52174104,51674006);安徽省教育厅研究生科研项目(YJS20210382)。

摘　　要：钻井法凿井具有本质安全、机械化程度高和成井质量好等优点,是我国深立井施工自动化、智能化的发展方向。开展钻井井壁、充填层和含水弱胶结围岩共同作用机理研究,为钻井法凿井在西部深厚含水弱胶结岩层中应用提供基础。首先,针对钻井井壁在正常使用阶段的工作条件,构建含水弱胶结围岩-充填层-钻井井壁流固耦合作用模型,基于厚壁圆筒理论、广义有效应力原理和达西渗流理论推导渗流场、应力场解析解;然后,以即将建设的陶忽图煤矿北风井为工程背景,得到该井筒周围渗流场及应力场分布规律,并通过数值计算方法对解析解进行验证。在此基础上,研究充填层的作用机理,分析充填层对井壁长期外荷载的影响。结果表明:径向有效应力分布曲线与孔隙水压力分布曲线的变化规律相似,越靠近井筒中心,孔隙水压力及径向有效应力越小;环向应力总体表现为越靠近井筒中心越大,最大值出现在井筒内侧。降低充填层的渗透率和增加充填层的厚度,提高了充填层分配有效应力和孔隙水压力的能力,传递到井壁的有效应力和孔隙水压力均降低;增大弹性模量,提高了充填层分配有效应力的能力,传递到井壁的有效应力降低。在西部地区钻井法凿井中,不应采用碎石充填,应研制高性能水泥砂浆充填材料;在钻进过程中,应控制偏斜率,提高充填层有效厚度。研究结果揭示了西部含水弱胶结岩层钻井井壁在使用阶段的受力机理,为钻井井壁长期受力分析提供了基础。The shaft drilling method has the advantages of intrinsic safety,high degree of mechanization,and good well completion quality.It is the development direction of automation and intelligence in deep shaft construction in China.The research on the interaction mechanism of drilling shaft lining,filling layer,and water-bearing weakly cemented surrounding rock was carried out to provide a basis for applying the shaft drilling method in deep and water-bearing weakly cemented strata in Western China.First,according to the working conditions of the drilling shaft lining in the employ stage,a fluidsolid coupling model of the interaction of water-bearing weakly cemented surrounding rock-flling layerdrilling shaft lining was constructed.The analytical solution of the seepage field and stress field were deduced based on the thick-walled cylinder theory,the generalized effective stress principle,and Darcy's seepage law.Then,the north air shaft of the Taohutu Coal Mine to be built was taken as the engineering background,the distribution law of the seepage field and the stress field around the wellbore were obtained,and the analytical solution was verified by the method of numerical calculation.On this basis,the action mechanism of the flling layer was studied,and the influence of the filling layer on the longterm external load of the shaft lining was analyzed.The results show that:The radial effective stress distribution curve is similar to the pore water pressure distribution curve,and the closer to the wellbore center,the smaller the pore water pressure and effective radial stress;The hoop stress is generally greater as it is closer to the wellbore center,and the maximum value appears at the inner side of the wellbore.Reducing the permeability and increasing the thickness of the filling layer can improve the ability of the filling layer to distribute effective stress and pore water pressure,the effective stress and the pore water pressure transmited to the shaft lining are reduced.Increasing the elastic modulus can improve t

关 键 词：含水弱胶结围岩 钻井井壁 充填层 流固耦合 作用机理 

分 类 号：TD262[矿业工程—矿井建设]