黄腊石滑坡下伏基岩弯曲松弛带研究

THE STUDY ON CROOKED AND SLACK BEDROCK ZONE UNDER HUANGLASHI LANDSLIDE

黄腊石滑坡下伏基岩断裂裂隙发育,岩性软弱,完整性差。小型褶曲和岩层倾倒现象并存,深部存在一定规模平行坡面的缓倾角断层,在内、外动力作用下,致使滑坡下伏基岩在一定深度范围内形成“弯曲松弛带”。查明基岩弯曲松弛带的特征及稳定性,对评价黄腊石滑坡的危害程度和选择合理的整治工程措施具有重要意义。本文全面论述了基岩弯曲松弛带的特征、空间分布、成因;分析了F_(55)、F_(40)、F_9等缓倾角断层的宏观和微观特征、物理力学性质;对基岩弯曲松弛带的稳定性和发展趋势作出了评价。

The bedrock under Huangiashi landslide, with fault and joint well developed, has a low strength and bad intactness, in which small folds, also topplings, exist. At some depth, there are a few small faults parallel to slope with a certain scale. By the affection of inner and outer dynamic forees for a long period, bedrock has come to be a crooked and slack zone(CSZ)up to a certain depth. Finding out the characteristics and stability of the CSZ is of great importance for assessing the harmfulness and selecting the fitable harness plan. Beside the features, dimensional distribution and origin of the CSZ, the macroscopic and microscopic characteristics, physical and mechanical properties of gently dipped fault (F55, F48, F9). the stability and developing tendency of the CSZ are also studied.