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葛洲坝二江基坑在开挖期间发现围岩移动,为了研究其原因,本文采用了岩组分析的方法.该法能精确地测量各组构要素的产状和利用数理统计来计算,从而分析岩石的形成条件和各种构造运动的成因与发展.通过岩组分析研究岩体内部产生差异运动引起造岩矿物的品格变化而形成的应力方位及其强弱。为此在二江基坑围岩沿一剖面取样12片,分别进行了 X 射线岩组和显微镜-费氏台岩组分析,将其结果进行对比,得出地质构造应力方位及其强弱.实践证明岩组分析得出的地应力方位及强弱与工程地质、地应力测量等方法所得的结果是一致的.通过这次试验研究证明利用岩组分析所得的地应力方位及其强弱对岩体工程稳定性评价是有意义的.
During the excavation of Gezhouba Erjiang Foundation Pit, the surrounding rock was found. In order to study the reason, the method of rock group analysis was adopted in this paper. This method can accurately measure the occurrence of each structural element and use mathematical statistics to calculate it. The formation conditions of rocks and the causes and development of various tectonic movements. Through rock group analysis, we study the stress orientation and strength of rock-forming minerals caused by differences in motion within the rock mass. For this purpose, 12 samples were taken along a section of the surrounding rock of the Erjiangkekeng pit. The X-ray rock group and the Microscope-Feifel tablerock group were analyzed respectively. The results were compared and the geologic structural stress azimuth and its strength were obtained. Practice has proved that the azimuth and strength of ground stress obtained by rock group analysis are consistent with the results obtained by engineering geology and in-situ stress measurement methods. Through this experimental study, it is proved that the azimuth and strength of ground stress obtained by rock group analysis are The stability evaluation of rock mass engineering is significant.