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东风水电站地下厂房位于乌江右岸山体内。在过去测试成果中,由于采用不同元件和方法,得出两种不同的第一主应力σ_1成果结论意见。文中概述了该厂房区的地层特点、围岩特点,以及地质构造主要特点;中南勘测设计院所取得的岩体应力量测成果,及其可靠度分析,特别是对第一主应力σ_1的论证。目前,施工单位已开挖地下厂房。为了确定应以哪种主应力方向为准,文章从检查测试技术、计算方法、地层岩性、地质力学及区域地质构造等方面进行综合评价分析,从而论证本水电站厂房区应以水平构造应力为主的原岩地应力场。
Dongfeng Hydropower Station underground plant is located in the right bank of Wujiang mountains. In the past test results, due to the use of different components and methods, come to two different conclusions of the first principal stress σ_1 conclusions. This paper summarizes the stratum characteristics, the features of surrounding rock and the main features of geological structure in this plant area; the results of rock mass stress measurement obtained by Zhongnan Institute of Survey and Design and their reliability analysis, especially the proof of the first principal stress σ_1 . At present, the construction unit has excavated the underground workshop. In order to determine what kind of principal stress should be the direction of the article from the inspection and testing techniques, calculation methods, stratigraphic lithology, geomechanics and regional geological structure and other aspects of a comprehensive evaluation and analysis to demonstrate that the hydropower plant area should be horizontal tectonic stress Lord’s original rock stress field.