隔河岩大坝灌浆帷幕岩体力学强度的扫描电镜试验研究

EXPERIMENTAL STUDY OF THE STRENGTH OF HIGH-PRESSURE CEMENT GROUTING REINFORCED ROCKMASS UNDER SEM OBSERVATION

通过在扫描电镜(SEM)下对隔河岩大坝灌浆帷幕岩体的试样切片进行抗压和抗拉试验,得到了高压灌浆后水泥结石充填和胶结的裂隙面力学强度参数;并根据胶结面和岩体内微裂隙分布网络,分析了高压灌浆的加固机制和岩体变形破坏的微观机制,得到了一些有意义的结论。本文结果说明,高压水泥灌浆有助于改善岩基的强度和刚度。

In this paper, the results of tensile and compression tests of rock samples from the high-pressure cement grouting curtain of the Geheyan Dam are presented. During the tests, the interfaces between the rockmass and cerment mortar were observed by SEM. With the observation of the distribution and propagation of microcracks as a basis, the micromechanics of failure of high-pressure cement grouting reinforced rockmass was analysed and some significant conclusions were drawn. The results of analysis suggest that the fissured rockmass in the dam abutments could be reinforced by high-pressure cement grouting.