岩体E_0-V_p关系曲线在大坝基岩鉴定中的应用——以乌江银盘水电站建基岩体验收为例

Application of deformation modulus and wave velocity curve in dam bedrock identification:acceptance case of bedrock of Yinpan Hydropower Station on Wujiang River

利用岩体变形模量与波速关系现场快速判定岩体质量,是一种有效的办法。通过收集银盘水电站前期勘探岩体原位试验的声波和变形模量资料,建立了E0-Vp关系曲线,并在纵向围堰建基岩体验收时,应用对比试验的方法对关系曲线作进一步修正,探讨分析了建立E0-Vp关系曲线的影响因素,并认为,通过简便的声波测试方法可以计算出较为准确的变形参数,从而判断大坝建基岩体质量。应用这种方法可为大坝建基岩体质量评定和验收提供可靠的依据。

It is an effective method to quickly identify the rock mass quality in the field by using the relationship between deformation modulus and wave velocity. Through collecting deformation modulus and acoustic wave data of the in - situ test at the early staged survey of Yinpan Hydropower Station, the Eo - Vp curve is established and further modified on the basis of contrast test during the acceptance work for bedrock of longitudinal cofferdam. The influential factors of establishing Eo - Vp curve are discussed and analyzed. It is believed that accurate deformation parameter can he calculated through convenient acoustic wave test, so as to evaluate the quality of bedrock, Which can be applied in evaluation and acceptance of rock quality of bedrock.