大坝建基岩体物理探测方法应用

大坝建基岩体弹性波检测工作是检测建基岩体施工质量的重要手段,是保证设计要求,确保坝体安全的重要措施,通过地震波法、超声测井法、声波跨孔法等多种综合物探方法的检测,提出岩体量化的物理参数,在大坝特定的基岩条件下,为工程界定建基岩体的质量提供有价值的判据。工程上较常用的有弹性波法评价建基岩体质量、声波波速随钻孔深度变化的曲线来确定爆破影响带、了解断层破碎带或裂隙密集带平面影响范围和垂向影响深度、通过基岩灌浆处理前后弹性波的变化来评价处理效果、其检测成果为工程质量评价和验收工作提供了重要依据。

APPLY PHYSICAL TESTING METHOD ON ROCK MASS OF DAM FOUNDATION

Elastic wave testing work of rock mass of dam foundation is an important means of inspect construction quality.It guarantees design requirement and ensures dam safe.By many comprehensive geophysical prospecting methods such as seismic wave,supersonic logging,supersonic CT,we present physical parameters of rock quantization,and in the special condition of rock mass dam foundation,provide valuable criterion for engineer definition of rock mass quality.In engineering,the elastic wave method is widely used for evaluating the quality of foundation rock mass.The relation curves of sonic wave velocity versus drill hole depth are used to determine the blastaffected zone and to understand the affected scope in plan and the vertically affected depth of a fault zone or dense fissure zone.The detecting results using the elastic wave method before and after foundation rock grout treatment are used for evaluating the treatment effect,and provide the project quality assessment and the project acceptance with the important basis.