Abstract: According to an analysis of in-situ stress measurements, on the whole, activity of general NE-trending Babaoshan, Huang zhuang and Gaoliying fault zone is considered as clockwise torsion Characters of in-situ stress state on different segments of the fault zone differ from main directions of the maximum horizontal compressive stresses in the Beijing-Tianjin-Tangshan area. General NE-trending fault zone shows tensile antitorsion components from the additional stress state calculated by stress principle of stress superposition of elastic theory. The fault segments in Dahuichang and Niukouyu zones have the same character as well. The stress state in this region is still considered as one in adjusment period after the major Tangshan earthquake. It seems that the stress state determined in deeper crust is affected by the tectonic activities too.

Key words: Beijing, Granodiorite mass, Stress state, Additional stress component, Rotation-torsion structure

摘要： 由本区实测原地应力资料分析认为,总体呈北东走向的八宝山、黄庄-高丽营断裂带总体活动性质为顺时针扭动。断裂带不同地段的实测应力状态各具的特征,不同于京津唐地区实测主压应力的主导方向。运用弹性理论的应力叠加原理计算出断层附近的附加应力状态,则显示了总体呈北东走向的断裂带存在张性反扭活动分量,大灰厂和牛口峪地段断层也存在同样特征。认为自唐山大震后,本区应力状态仍处于调整阶段。测得的较深部位的应力状态也似乎受到了构造活动的影响。

关键词: 北京房山, 花岗闪长岩体, 应力状态, 附加应力分量, 旋扭构造