基于统计检验的不同地质环境下岩芯声波特征

Sonic characteristic of rock core under different geology environment based on statistic test

高温、高地应力和高渗透压力的地质环境对围岩强度和变形特征的影响是隧道设计和施工所面临的关键问题,直接影响支护形式和施工安全。对南水北调阿坝俄休沟线路的钻孔岩芯,进行不同地质环境模拟的声波检测,应用维尔卡森、H和富里德曼理论进行声波参数的特征检验。结果显示,高围压(60 MPa)导致岩芯中可能出现裂隙,对试样的波速特征具明显影响;而高温(≤70°C)和高渗透压力(≤10 MPa)对岩芯的的波速特征无显著影响;在多因素综合影响下,岩芯的的波速特征存在明显差异。这对于洞室设计中围岩分类及其支护设计具有重要意义。

The effect of the geology environment with high temperature,high ground stress and high seepage pressure on the characteristic of strength and deformation of the surrounding rock is one of the most important key problems in tunnel design and construction,which bears direct influence on the type of supporting and the safts of construction.This article aims to determine the sonic characteristic of the rock core and to simulate different geology environments by the theory of Wilcoxon,H and Friedman test.The sample was chosen from the drill on the Abawoxiu ditch line of the west-line first-engineering of the south-to-north water diversion.The result shows that high surrounding pressure（60MPa） can cause the fissure emerging of samples and possess obvious influence on the sonic characteristic of the sample;that null hypothesis can be accepted that high temperature（≤70 °C） and high seepage pressure（≤10 MPa） influence the sonic characteristic of the sample;and that there is obvious difference in the sonic characteristic of the samples under multi-geology environment,which is very important to guide surrounding rock classification and supporting design.