灰岩注浆帷幕体渗透特性的试验研究

Test Study on Seepage Permeability of Limestone Grouting Wall System

为了研究注浆堵水帷幕的稳定性,对灰岩注浆帷幕体的渗透特性进行了试验研究,获得了灰岩注浆帷幕体受压破坏全过程的渗透规律。结果表明:应变-渗透系数曲线峰值滞后于应变-应力曲线峰值,说明岩石破裂先于透水发生,是透水发生的直接原因。试样的渗透破裂过程一般由稳定渗透、加速渗透和渗透破坏三个阶段组成,裂隙和注浆结石对渗透系数有明显的影响,轴向贯通的大裂隙或大结石对渗透系数影响最大。

For the stability analysis of grouting water proof wall,the seepage permeability of limestone grouting wall system was tested,the overall process of seepage of the limestone grouting wall system is obtained.The results show that the peak of strain-permeability coefficient lags behind the peak of strain-stress,which shows that rock rupture happened precede penetration,and it is the direct cause of penetration.The osmotic rupture process is generally composed of stationary stage,evolution stage and absolute fracture stage ; The fissure and grouting stone effect on permeability coefficient is obvious, the big fissure and concretion perforated along axial direction have the most effect on permeability coefficient.