林志斌, 李亚豪, 林培忠,等.损伤-渗流耦合作用下上覆溶洞隧道突水灾变规律研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023090052.

LIN Z B, LI Y H, LIN P Z, et al.Study on the law of water inrush disaster in overlying karst tunnel under damage-seepage coupling[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023090052.

损伤-渗流耦合作用下上覆溶洞隧道突水灾变规律研究(网络首发)

林志斌1, 李亚豪1, 林培忠2, 张勃阳1, 杨大方1

1.河南理工大学 土木工程学院，河南 焦作，454000；2.河南省自然资源监测与国土整治院，河南 郑州 450000

摘要:为研究上覆溶洞隧道的突水灾变时空演化规律，以双碑隧道工程为背景，基于三线性应变软化模型建立岩体损伤-渗流耦合模型,采用FLAC3D对隧道开挖通过上覆溶洞过程中围岩的变形、塑性区、渗透系数以及涌水量进行了数值模拟研究分析，在此基础上，对比分析了不考虑岩体损伤-渗流耦合作用以及不同溶洞水压对上覆溶洞隧道突水灾变特征的影响。研究结果表明:(1)隧道开挖通过上覆溶洞后，隧道围岩将在溶洞与隧道间产生两条“八字形”的导水裂隙带，导致溶洞与隧道间岩体沿着这两条裂隙带向隧道内发生整体滑动，并且出现严重的突水突泥事故;(2)隧道开挖通过上覆溶洞过程中，其突水表现出一定的滞后性、突发性和大体量性等特征;(3)相较于分析塑性区，研究围岩渗透系数变化更能直观、合适地反映隧道与含水致灾构造之间渗流或裂隙通道的变化情况，为模拟重现岩溶隧道开挖过程中的突水灾变时空演化过程，必须考虑岩体的损伤-渗流耦合作用;(4）隧道开挖通过溶洞的过程中，上覆溶洞水压越大，隧道就会越早开始突水，其最终突水量也将越高。

关键词:溶洞;隧道;损伤-渗流耦合;突水;渗透系数;涌水量

中图分类号：U456.33

doi:10.16186/j.cnki.1673-9787.2023090052

基金项目:国家自然科学基金资助项目（52374087，51708185）；河南省重点研发与推广项目（NSFRF230632）；安全学科“双一流”创建工程项目 （AQ20230733，AQ20230734）

收稿日期:2023-09-22

修回日期:2023-11-03

网络首发日期:2023-11-30

Study on the law of water inrush disaster in overlying karst tunnel under damage-seepage coupling（Online）

LIN Zhibin1, LI Yahao1, LIN Peizhong2, ZHANG Boyang1, YANG Dafang1

1.School of Civil Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China；2.Henan Natural Resources Monitoring and Land Consolidation Institute， Zhengzhou  450016，Henan， China

Abstract:In order to study the temporal and spatial evolution law of water inrush disaster in overlying karst tunnel， taking Shuangbei tunnel engineering as the background， the rock mass damage-seepage coupling model is established based on the trilinear strain softening model. FLAC3D is used to simulate the deformation， plastic zone， permeability coefficient and water inflow of surrounding rock during tunnel excavation through overlying karst cave. On this basis， the influence of rock mass damage-seepage coupling and different karst cave water pressures on the characteristics of water inrush disaster in the overlying karst tunnel are compared and analyzed. The results show that： （1） After the tunnel excavation passes through the overlying karst cave， the tunnel surrounding rock will produce two 'eight-shaped' water-conducting fracture zones between karst cave and tunnel， resulting in the overall sliding of the rock mass between karst cave and tunnel along these two fracture zones to the tunnel， and serious water and mud inrush accidents occur. （2） In the process of tunnel excavation through the overlying karst cave， the water inrush shows a certain lag， sudden and large-scale characteristics. （3） Compared with the analysis of plastic zone， it is more intuitive and appropriate to study the change of surrounding rock permeability coefficient to reflect the change of seepage or fracture channel between tunnel and water-bearing disaster-causing structure. In order to simulate and reproduce the spatial and temporal evolution process of water inrush disaster in the process of karst tunnel excavation, the damage-seepage coupling effect of rock mass must be considered. (4)In the process of tunnel excavation through the karst cave, the greater the water pressure of overlying karst cave,the earlier the tunnel will start water inrush, and the higher the final water inrush will be.

Key words:karst cave;tunnel;damage-seepage coupling;water inrush;permeability coefficient;water inflow

CLC：U456.33