动水环境下粗糙单裂隙注浆数值模拟

动水环境下水泥浆液在裂隙中的扩散规律是裂隙注浆研究的一个重点,用有限元模拟浆液在粗糙单裂隙中扩散过程,对浆液在动水环境下影响因素进行了分析,利用裂隙走向上的曲折表征裂隙的粗糙度,建立裂隙三维模型形成独立的流域,设定注浆压力、动水流速及初始边界条件进行计算。注浆时间、注浆压力及粗糙度系数3个因素各4个水平,保持其中两个因素取值不变,另一个因素分别取4个水平值时的浆液扩散情况,得到各因素对浆液扩散距离的影响。结果表明,浆液扩散距离与时间、注浆压力呈线性关系,时间越长,浆液扩散越远;注浆压力越大,扩散越远;浆液扩散距离与节理粗糙度系数关系呈负相关关系,节理粗糙度系数越大,浆液扩散距离越小。

Rough Single Fracture Grouting Numerical Simulation in Hydrodynamic Environment

Diffusion law of the cement slurry in fracture in dynamic water environment is a hot topic for research of fracture grouting. The cement slurry diffusion process in a single fracture with a certain roughness was simulated by finite element method, and the diffusion forms of the cement slurry in dynamic water environment and influencing factors were analyzed. Twists and turns of fracture along the strike characterized the fracture roughness, and a three-dimensional geometric model of fracture was built to form a separate basin, then grouting pressure, flowing water velocity values, initial and boundary conditions were set, finally the models were calculated by the finite element analysis software. Three factors of grouting time, grouting pressure and roughness coefficients had four levels, grout diffusion changes were analyzed when two factors maintained constant values and another factor was taken the four levels, which showed the impacts of the three factors on grout diffusion distance. Results show that the slurry diffusion distance possess linear relationship with the grouting pressure and time, the longer the time is, the farther slurry diffuses; the greater the grouting pressure is, the faster slurry velocity is, the farther slurry diffuses; Grouting diffusion distance is negatively correlated with the joint roughness coefficient, the smaller the joint roughness coefficient is, the nearer slurry diffuses.