乌东德水电站坝址岩体变形试验与地质分析

Deformation test and geologic analysis of rock mass at dam site of Wudongde Hydropower Station

乌东德水电站建坝岩体为中元古界会理群落雪组灰岩、大理岩,因其变形模量范围值与平均值分别高达18.22～69.69GPa和44.83GPa而受到业内专家质疑。为此,从试验方法适宜性分析、试验设备改进、现场试验复核、试验成果分析等方面对岩体变形特性进行了试验研究,从坝址所处地质构造环境、岩性岩相等方面对岩体变形特性进行深入的地质分析,得出如下结论:刚性承压板法与柔性承压板法在现场岩体测试中各有利弊,坚硬完整岩体宜用柔性承压板、半坚硬和软弱岩体宜用刚性承压板;两种试验方法所得测试成果虽有差异,但成果相近、量值相当,均真实地反映了客观地质条件。

The dam foundation rock mass of Wudongde hydropower station is limestone and griotte of Mesoproterozoic Huili group luoxue formation,for the variation scope and average value of their deformation modulus up to 18.22~69.69 GPa and 44.83 GPa,it is questioned by experts.For this reason,the properties of the rock deformation are tested and studied from the aspects of test method adaptability,test equipment improvement,on-site test check,test result analysis and more deeply geologic analysis is conducted from geologic tectonic environment,rock property and rock phase.The conclusions are as follow:rigid bearing plate method and flexible bearing plate method respectively have advantages and disadvantages,flexible bearing plate method is adaptable for hard and sound rock mass and rigid bearing plate method is adaptable for semi-hard and soft rock mass;although the test results of 2 test methods have difference,the results is approximated and the magnitude is same;both methods can really reflect objective geologic condition.