应用声波测试评价秦山核电二期工程岩基稳定性

本文根据单孔声波测井、电火花、剪切锤、大距离放炮等不同振源的跨孔测试及岩心超声测试资料,利用纵横波波速及跨孔穿透信号的波形特征,振幅衰减,频率成分的变化、尾波面貌、横波分裂等,对秦山核电二期工程地基岩体的风化程度、裂隙发育程度、岩性均一性、岩体完整性、岩体各向异性等进行了定量评价。进而根据速度各向异性的图形、确定了岩体中应力的方向。为综合评价该工程地基稳定性提供了可靠依据。

APPLICATION OF SONIC TESTING TO ASSESS THE ROCK FOUNDATION STABILITY OF THE SECOND STAGE QINSHAN NUCLEAR POWER PROJECT

Based on the data of single hole sonic logging, crosshole testing of different seismic sources such as electric spark,shear hammer.large distance shotting ,and the rock core ultrasonic testing etc. ,using the longitudinal and transverse wave velocity and the waveform characteristics. amplitude attenuation. variation of frequency constituents, wave rear features, transverse wave splitting etc of the crosshole transparent signal this paper presents a quantitative assessment of the degree of weathering of foundation rock mass, degree of fissure development, uniformity of rock properties, integrity of rock mass and the anisotropy of bedrock etc. Thence, from the figure of the velocity anisotropy. it determines the directions of stresses and provide a reliable basis for comprehensive assessment of the foundation stability of the project.