卡里巴电站南岸扩机工程岩体特性综合测井试验

利用测井技术研究水电工程岩体结构和质量已被证明为一种可靠的方法。为评价卡里巴电站南岸扩机工程Sd01部位、进水口闸门井和进水口上游围堰岩体地质条件和结构特性,基于声学与光学测井技术开展了相关部位的现场试验研究,获得了上述部位的覆盖层厚度、基岩风化特征、基岩裂隙发育情况和基岩波速分布特性。试验结果表明:上述部位的水位分别为11.7,13.1,14.1~16.5 m;平均波速分别为3 200,3 500,2 000 m/s;覆盖层厚度分别为21,26,>30 m;Sd01部位和闸门井岩体较完整,主要裂隙统计分别为12条和11条;上游围堰岩体较破碎,强风化。

Experimental Investigations of Rock Mass for South Bank Expansion Project of Kariba Power Station by Comprehensive Logging

Well logging technology has been proved to be a reliable method to researching the rock mass structure and quality in hydropower project. In order to estimate the geological conditions and structural characteristics of rock mass, we took the south bank expansion project of Kariba power station as an example and carried out rock mass test at position Sd01, upstream cofferdam of water inlet and gate shaft of water inlet. By adopting acoustic and optical logging technology, we conducted in-site test and obtained the thickness of covering layer, weathering degree of bedrock, fissures development degree, and acoustic velocity of rock mass. The experimental results show that the water level at these places is 11.7, 13.1, 14.1-16.5 m,respectively, and average wave velocity is 3 200, 3 500, 2 000 m/s ,respectively,and the thickness of the covering layer is 21, 26 m, and above 30 m. Furthermore, the rock mass at Sd01 site and the gate shaft is relatively complete, with 12 and 11 fractures,whereas the rock mass of upstream cofferdam is broken and strongly weathered.