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本文通过有限单元法和布辛涅斯克方程解分别计算了拟建龙滩水库区的初始构造应力场和库水附加应力场。计算结果和地震地质资料表明:目前,本区主压应力方向大约为北85°西左右。在这个区域应力作用之下,北西西—北西向断裂、北东东—北东向断裂是本区主要活动构造。考虑水体荷载产生的附加应力作用,坝区西南北西西—北西、北东东—北东走向的纳么、八南、党明—平腊、逻西等断裂可能会诱发地震。
In this paper, the initial tectonic stress field and additional water stress field of Longtan reservoir area are calculated respectively by the finite element method and the solution of the Bursianus equation. The calculation results and seismic geological data show that at present, the principal compressive stress direction in this area is about 85 ° north west. Under the regional stress, the NW-NWW and NE-NEW faults are the main active tectonics in this area. Considering the additional stress caused by water body load, faults such as Naxi, Bainan, Dangming-Pingla and Lushu-east faults in west-northwest, northwest and north-east-northeast of the dam may induce earthquakes.