浅成基性侵入辉绿岩固结灌浆分析

An Analysis of Consolidation Grouting of Shallow-based Intrusive Diabase

在水利工程建设中,特别是在大型水利枢纽工程往往面临复杂的工程地质条件。同时,卸荷及爆破累积破坏作用也会造成建筑物基面下一定范围内岩体物理力学参数弱化,固结灌浆往往作为一种基面补强手段运用到工程中。通过分析某溢洪道泄槽段弱风化上带浅成侵入辉绿岩开挖前、后垂直方向波速变化情况,及其固结灌浆前、后波速变化情况,结合多组现场试验波速测试成果,确定弱风化辉绿岩无盖重固结灌浆是可以达到波速总体提高率15%的效果,但其表层存在的固结灌浆盲区往往是工程处理后的薄弱部位,以提高建基面完整性为目的时无盖重固结灌浆应慎重选用。

In the construction of water conservancy projects,especially in large-scale water conservancy projects,complex engineering geological conditions are often encountered.At the same time,the unloading and blasting cumulative damage will also weaken the physical and mechanical parameters of the rock mass within a certain range under the base of the building.Consolidation grouting is often applied to the project as a base reinforcement.In this paper,the variation of the wave velocity in the vertical direction before and after the excavation of the shallow-intrusive diabase in the weakly weathered upper section of a spillway is analyzed,and the wave velocity changes before and after the consolidation grouting are combined with the results of the multi-group field test wave velocity test.It is determined that the weakly weathered diabase unconsolidated grouting can achieve the effect of the overall rate of increase of wave velocity by 15%,but the confined grouting zone in the surface layer is often the weak part after engineering treatment to improve the integrity of the base.For the purpose of no-consolidation grouting should be carefully selected.