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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H>100m,边坡坡角β>35°,岩层倾角α>60°,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β>30°及岩层倾角α>30°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α>δ时边坡将可能产生倾倒破坏,当α<δ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α>δ时边坡才可能演化成明显倾倒变形,当α<δ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。
In previous studies, the study of dumping deformation is more in the anti-dumping slope and few in the slope along the slope, there are more gaps in the similarities and differences of the pouring bodies of the two different structures. On the basis of summarizing a large number of examples of pouring bodies, the forming conditions and scale characteristics of stratified anti-dumping and progressive slope dumping were studied in detail. The results show that if the inclined slope is dumped, the slope height H> 100m, slope angle β> 35 ° and dip angle α> 60 °, and the lithology is thin or soft between the thin layer and the middle layer Rock and soft and hard rock. The anti-dip slope may dip when the slope angle β> 30 ° and the dip angle α> 30 °. The lithology is thin-medium-thick layered soft rock, hard rock, The hard rock like stratigraphic structure can be proposed. The concept of layered rock slope “critical dumping angle δ” is proposed. For a straight slope, δ≈60 °, the slope may be dumped when α> δ When α <δ, the landslide normally produces “slip-bend” or “slip-crack” damage along the bedding plane. The anti-dip slope δ≈30 °, when α> δ, Slope can evolve into obvious overturning deformation. When α <δ, the slope does not fall or dump is not obvious. For two kinds of slopes with basically same geological conditions and different slope structures, The area of development distribution or dumping depth is usually larger than that of downhill slope, and once the body is poured, the size of both is usually deep, large or extra-large; the distribution area and pouring depth of the body are both presented The trend of increasing with the increase of slope height shows that the distribution area and pouring depth increase sharply when the height of slope is H = 250m, and the increase of reverse slope is larger than that of forward slope.