大柳树高坝F201断层避让距离研究

利用国内外类似构造位置上的走滑型、逆走滑型发震断层极震区IX度等震线短轴在断层上、下盘分布宽度的统计分析，探讨了大柳树高坝的F201断层避让距离问题。经统计分析，给出了活断层IX度等震线短轴在断层上盘的优势宽度为6～6．4km，在这个距离之内，活断层的粘滑或蠕滑运动都可能会在地表产生永久性形变，同震或震后灾害严重，对于工程而言存在抗断问题。因此，这个数据可作为F201发震断层避让距离的参考值。野外调查表明大柳树高坝距F201活断层仅1．5km，小于本研究得出的活断层避让距离，而且坝址位于F201活断层上盘，因此不适宜在大柳树坝址修建水利水电工程。

Distance of the Daliushu Dam, Heishanxia, the Yellow River Evading Active Fault F201

The Daliushu A-class water and electricity project is planning to be built at Daliushu, Heishanxia of the Yellow River. In order to find the distance of the dam evading the active fault F201 , we used the width data of the short axes of intensity IX isoseismal on the strike-slip and reverse strike-slip active faults, the structure situations of which are similar to the F201 , to make a statistic analysis. It is concluded that the evaded distance of the active fault is about 6 - 6.4 km. Based on the geological-seismic field investigation, the distance from the Daliushu Dam to the F201 is only 1.5 km, and it is on the hanging wall of the fault F201 , so it is a dangerous site for the Daliushu high dam.