葛洲坝二江基坑围岩岩组分析

摘要/Abstract

摘要： 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.

关键词: 岩组分析, 构造应力, 岩体工程, 应力场, 造岩矿物, 反射强度, 五龙组, 矿物成份, 费氏, 岩体力学

Abstract: The foundation pit of Gezhouba Dam at the part of Erjiang River was discovered to remove in surrounding rock during excavation. For the purpose of ingestigation of its causes, a fabric analysis method is adopted in this paper. The occurrence of each fabric factor can be accurately measured and calculated by the mathematical statistics, so as to analyse the formation conditions of rock and the genesis and development of various tectonic movements. The orientation and magnitude of rock stresses are studied due to changes of crystal lattice of rock-forming minerals caused by differential movements inside the rock. Twelve pieces of sample which were cut off from the original rock as the Dam site were fabrically analysed respectively by X-ray method and microscope (F fabric) method. By comparing with each other, the orientation and magnitude of the tectonic stresses were obtained. It is shown that the orientation and magnitudes of in-situ geo-stress as determined from the fabric analysis are in accord with the results obtained from engineering geology or in-situ stress measurement. From this research, the orientations and magnitudes of geo-stress determined by the fabric analysis are found to be ;suitable for evaluating stability in rock engineering.

谢开容. 葛洲坝二江基坑围岩岩组分析[J]. , 1982, 3(1): 65-74.

Xie Kai-rong. Fabric Analysis of Surrounding Rock of Erjiang River Foundation Pit at Gezhouba Dam[J]. , 1982, 3(1): 65-74.

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