固结灌浆后岩体变形模量的确定方法——以高摩赞大坝枢纽工程为例

An Approach of Determining the Deformation Modulus of Rock Mass after Consolidation Grouting: Case Study of Gomal Zam Dam Multipurpose Project

根据国内外工程经验,岩体变形模量的确定方法主要有现场试验和间接估算。固结灌浆后建基岩体的变形模量,往往难以进行大量的现场试验,而固结灌浆后的检查孔多会进行孔内声波测试。结合工程实例,在取得大量纵波测试数据和现场岩体变形模量试验资料基础上,拟合出纵波速度与岩体变形模量的相关关系,利用固结灌浆检查孔实测声波纵波速度,采用拟合的相关关系,对固结灌浆后岩体变形模量进行估算的方法,经济、便捷地取得灌浆后岩体的变形模量值。为工程设计复核提供了可靠的依据,可用于相似工程或试验资料不足工程灌浆岩体变形模量的确定。

The deformation modulus of rock mass is generally directly determined by field tests and indirectly estimated by relationships with other geo-parameters.For dam foundation rock mass,it is impractical to carry out sufficient field tests to verify the improvement of modulus after consolidation grouting.In this research,several relationships for estimating the value of grouted rock mass deformation modulus were proposed on the basis of longitudinal wave velocity,which can be economically and conveniently measured by geophysical prospecting.Gomal Zam Dam multipurpose project was taken as an example.This approach could be applied to determine the rock mass deformation modulus of similar projects or projects in lack of field data.