层状反倾-顺倾边坡倾倒变形形成条件及发育规模特征

发布时间：2018-01-15 05:04

  本文关键词：层状反倾-顺倾边坡倾倒变形形成条件及发育规模特征　出处：《岩土力学》2016年S2期 　论文类型：期刊论文

  更多相关文章： 陡倾层状边坡 倾倒变形 形成条件 发育分布特征

【摘要】：以往研究中倾倒变形研究在反倾边坡较多而在顺倾边坡中很少,对两种不同结构的边坡形成倾倒体的异同点更是存在较多空白。在总结大量倾倒体实例基础上,对层状反倾和顺倾边坡倾倒变形形成条件及发育规模特征进行了详细研究。结果表明,顺倾边坡若发生倾倒,通常表现为坡高H100m,边坡坡角β35°,岩层倾角α60°,岩性为薄层或薄层与中层互层的软岩、软硬相间的岩石;反倾边坡当坡角β30°及岩层倾角α30°就可能发生倾倒,其岩性为薄层~中厚层状的软岩、硬岩及具有似层状结构的坚硬岩石均可;提出层状岩质边坡"倾倒临界倾角δ"的概念,对于顺倾边坡,δ≈60°,当αδ时边坡将可能产生倾倒破坏,当αδ时边坡通常产生顺层面的"滑移-弯曲"或"滑移-拉裂"型破坏;反倾边坡δ≈30°,当αδ时边坡才可能演化成明显倾倒变形,当αδ时边坡不会倾倒或倾倒不明显;对于地质条件基本相同而坡体结构不同的两种边坡,反倾边坡形成的倾倒体无论是发育分布面积还是倾倒深度通常是大于顺倾边坡的,而且一旦形成倾倒体,二者的规模通常是深层的、大型或特大型的;倾倒体的分布面积和倾倒深度均呈现一种随坡高的增加而增加的趋势,坡高H=250m时其分布面积和倾倒深度表现为陡然增加,并且反倾边坡增加幅度大于顺倾边坡。
[Abstract]:In the previous research, the research of dumping deformation is more in the reverse slope than in the downdip slope, and there are many gaps in the formation of the toppling body of the two kinds of slope with different structure. On the basis of summing up a large number of examples of the dumping body, there are many gaps. The forming conditions and the developing scale characteristics of the toppling deformation of the layered and downdip slopes are studied in detail. The results show that the slope height H 100m and the slope angle 尾 35 掳are usually shown in the downdip slope. The dipping angle of rock is 伪 60 掳, the lithology is soft rock with thin layer or thin layer and interbedded with middle layer, and the rock with soft and hard phase; When the slope angle 尾 30 掳and rock stratum dip angle 伪 30 掳, the slope slope can be toppled. Its lithology is thin layer to medium thick layered soft rock, hard rock and hard rock with similar layered structure. The concept of "tipping critical dip angle 未" for bedded rock slope is put forward. For the downdip slope, 未 鈮，

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