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利用微断层研究方法,由定性到半定量,由点到面地分析了西安—南京线越岭长隧道地区的区域构造应力场演化、性质、方向和构造应力作用方式,为越岭长隧道方案比选提供了应力场依据。根据微构造法计算结果,本区新构造及现代构造应力场经历了:松弛期应力场、NW向挤压NE向拉伸的构造应力期、NE向挤压NW向拉伸的构造应力期。自第三纪以来,区域应力状态从总体上讲,是以垂直方向抬升、水平方向拉伸为主,现代构造应力场的性质是NE—SW或NEE—SWW向的挤压。从晚近地质时期到现代主压应力方向为NE向,σ1优势方位为NNE—NE向。自第二期应力场以来,主应力作用方式都是水平挤压或水平拉伸。
Using the method of microtachography, from qualitative to semi-quantitative, the evolution, properties, direction and tectonic stress of the regional tectonic stress field in the Xian-Nanjing line Longyan tunnel are analyzed from point to surface, Comparison provides a basis for stress field. According to the calculation results of the micro-structure method, the new tectonic and modern tectonic stress fields in this area experienced the stress field in relaxation phase, the tectonic stress phase of NE trending in NW trending and the tectonic stress phase of NE trending in NW trending. Since the Tertiary, the state of regional stress has been generally uplifted in the vertical direction and oriented in the horizontal direction. The stress field in modern tectonics is squeezed in NE-SW or NEE-SWW directions. From the recent geologic period to the direction of modern main compressive stress, the direction of NE is NE, and the predominant azimuth of σ1 is NNE-NE direction. Since the second stress field, the main stress mode of action is horizontal extrusion or horizontal stretching.