摘要
某水电站工程场地位于金沙江中游河段内,属于高山峡谷地貌。坝址区前期受印支运动期NE向构造应力作用,后期又逐渐转向为NNE向。坝址区发育有其宗向斜褶皱构造,轴向延NW-SE向展布。由于枢纽方位与坝址区河谷方向近重合,其宗向斜控制了坝址区的岩层产状、地质构造展布。主要构造应力场的三向应力状态由"潜在逆断型"转变为"潜在走滑型"。地质构造的复杂,成为影响坝址选择及枢纽布置格局的关键因素。同时,对坝址区地质构造的研究,也为坝型设计的合理优化,提供可靠的科学依据。
A hydropower station is located in the middle reaches of Jinsha River.The topography belongs to an alpine valley.In prophase,the dam area is endured with NE strike tectonic stress in Indosinian movement epoch,and then gradually turning to NNE during anaphase.Qizong synclinal fold structure is developed in the dam area,which spreads along NW to SE in axial direction.For the direction of the valley in the dam area is approximately coincided with the pivotal syncline,the rock attitude and the spread of geological structure in the dam site are controlled by Qizong syncline.The triaxial stress state is turned from ＂potential thrust type＂ to ＂potential strike-slip type＂ in the main tectonic stress field.The geological structure is complicated,which becomes a critical factor affecting the dam site selection and the hydro-junction layout.At the same time,the research on the geological structure in the dam site will also offer the reliable basis for optimization of the dam pattern.
出处
《水利与建筑工程学报》
2009年第2期120-122,126,共4页
Journal of Water Resources and Architectural Engineering
关键词
地质构造
构造应力场
下坝址
工程影响
geological structure
tectonic stress field
dam site
engineering influence
