基于波速测试的裂隙岩体固结灌浆效果分析

以福建某坝基固结灌浆工程实例为研究对象，采用单孔、跨孔声波测试及地震波测试技术对灌浆前、后岩体纵波波速进行检测。采用弹性理论计算动弹性模量，研究灌浆前、后变形参数的变化；对Hoek-Brown准则进行修正，用波速计算Hoek-Brown准则的强度参数，研究灌浆前、后强度参数的变化。研究结果表明，固结灌浆效果受岩体本身的可灌性控制，并受岩体结构影响。不同方向的固结灌浆效果是不同的，对于强风化岩体，垂直向固结效果优于水平向；对于具有缓倾结构面的中风化岩体，水平向固结效果优于垂直向。动弹性模量提高率与波速提高率呈二次函数关系。强风化岩的m（为Hoek-Brown常数）和s（为与岩体质量有关的常数）值提高率与波速提高率均呈一次函数关系，中风化岩则均呈三次函数关系。研究成果对灌浆设计和施工有重要的指导意义。

Analysis of consolidation grouting effect of fractured rock mass based on wave velocity test

Based on a dam foundation engineering in Fujuan province, single-hole acoustic test, cross-hole acoustic test and seismic wave test were carried out to detect the P-wave velocity of dam foundation rock mass before and after consolidation grouting. The elastic theory was used to calculate dynamic elastic modulus; and the change of deformation parameters before and after consolidation grouting were studied. A modified Hoek-Brown criterion was proposed to calculate the parameters in Hoek-Brown criterion. The results show that the consolidation grouting effect is controlled by the groutability of rock mass and effected by the rock mass structure. The consolidation grouting effects in different directions are different. For strongly weathered rocks, the consolidation grouting effect in vertical direction is better than that in horizontal direction. For medium weathered rocks with gently dipping discontinuous faces, the consolidation grouting effect in horizontal direction is better than that in vertical direction. The functional relationship between the increasing rate of dynamic elastic modulus and the increasing rate of velocity is quadratic. The functional relationship between the increasing rates of m, s (where m is Hoek-Brown parameter, s is parameter related to quality of rock mass) and the increasing rate of velocity for strongly weathered rocks are both linear and for medium weathered rocks are both cubic. It is of important significance for design and construction of grouting.