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乌江构皮滩水电站高拱坝建基面开挖成型后,在建基面上进行大量的声波测试,通过不同高程、不同部位的声波测试,根据波速沿坡距综合关系曲线确定卸荷深度,并分析波速分布的规律及特征。在卸荷带内进行35点原位变形试验,其加载路径和最大压力与拱坝作用于岩体的条件相似。通过35点变形试点的动静对比试验,建立卸荷岩体变形参数与波速之间的关系,利用大范围的声波测试结果评价卸荷带岩体变形参数。结合开挖前后波速和变形参数的变化规律,分析研究该高拱坝建基面卸荷岩体变形参数的弱化程度。试验结果表明,建基面卸荷深度为6m,卸荷带岩体平均波速降低7.0%,平均变形模量由29.1GPa降低至16.2GPa,平均降低43.6%。提出卸荷岩体的变形参数及取值方法。
After excavation and forming of the high arch dam foundation wall of Goupitan Hydropower Station in Wujiang River, a large number of acoustic tests were carried out on the foundation surface. Through the acoustic tests at different elevations and different positions, the unloading depth was determined according to the comprehensive relationship curve of wave speed along the slope. And analyze the rules and characteristics of wave velocity distribution. 35 points in-situ deformation in the unloading zone test, the loading path and the maximum pressure with the arch dam on rock conditions similar. By comparing the static and dynamic tests of the 35-point deformation experiment, the relationship between the deformation parameters and the wave velocity of the unloading rock mass is established, and the deformation parameters of the rock mass in the unloading zone are evaluated by using a large range of acoustic wave test results. According to the variation of wave velocity and deformation parameters before and after excavation, the degree of weakening of the deformation parameters of unloading rock mass is analyzed and studied. The experimental results show that the unloading depth of the foundation is 6m, the average velocity of rock mass in the unloading zone decreases 7.0%, and the average deformation modulus decreases from 29.1GPa to 16.2GPa, with an average reduction of 43.6%. The deformation parameters and values of unloading rock mass are proposed.