全风化花岗岩注浆加固特性试验研究

Experimental study on physico-mechanical properties of grouted completely weathered granite

为研究注浆对全风化花岗岩物理力学特性与水稳定性的影响规律,开展不同浆液填充率全风化花岗岩注浆试样的三轴、渗透及湿化试验,结果表明:随着浆液填充率的增加,全风化花岗岩注浆试样应力–应变曲线由应变硬化型逐渐转变为应变软化型,黏聚力和变形模量均呈指数型增加,内摩擦角以抛物线型式先增大后减小,而渗透系数则呈负指数型减小。在此基础上,建立黏聚力、内摩擦角、变形模量及渗透系数随浆液填充率变化的演化方程,并对全风化花岗岩注浆堵水加固机制进行分析,研究成果对于科学评价全风化花岗岩注浆效果、合理确定注浆方案与注浆量具有重要的指导意义。

In order to study the physico-mechanical properties and slake durability of grouted completely weathered granite, triaxial shear test, permeability test and slake durability test were carried out with different grout filling ratios. The test results show that stress-strain curves transform from strain-hardening to strain-softening when the grout filling ratio increasing. With the increase of grout filling ratio, the cohesion and deformation modulus increase exponentially, and internal friction angle varies in parabolic form, while permeability coefficient decreases in the form of negative exponential. Based on these test results, regression equations of cohesion, internal friction angle, deformation modulus and permeability coefficient to grout filling ratio are established respectively. And the mechanism of grouting for reinforcement and water sealing has been discussed briefly. The research results have a guiding significance for the evaluation of grouting effect and determination on the grouting scheme and quantity.