摘要
本书比较系统地反映了长江三峡库区地质灾害成因与评价研究3个空间尺度进展。一是大尺度范围,即整个三峡库区涉及的19个县（区）行政管辖范围内的地质灾害调查评价,重点是区域地质灾害评价预警的＂发育度＂、潜势度、＂危险度＂和＂危害度＂递进分析方法与应用。二是中尺度范围,即长江三峡江段复杂斜坡（滑坡）的成因研究.
Bearing behaviour of the pile in the beaded karst cave is very complex. It is of great significant to study the response characteristics coupling the load transfer of the pile and the stability of karst cave. Calculation on the bearing characteristics of the pile and the stability of beaded karst cave is made with the Plaxis 2D and Abaqus 3D. The numerical results show that the punching failure happens in the top rock when the ratio of the top rock thickness vs the cave span is small, while punching shear failure happens at larger ratio. There are multiple maxima of the side resistance around the pile because of the existence of the beaded karst carve. The number of the points is related to the top rock thickness, number of the karst carves and the floor rock thickness. The side resistance will fall down quickly around the free face of the top rock. The area size is related to the thickness of the surrounding rock and its displacement. The difference will become small under larger load. The maximum of the side resistancearound the middle rock layer locates at the middle, and the maximum value declines with the increase of the middle rock layer thickness. Besides, the side resistance distributes as the isosceles triangle with the thin middle rock layer, while it distributes as ladder shape with thick middle rock layer. The thicker the middle rock layer, the greater the ladder span, and the more uniform distribution of the side resistance. However, the side resistance distribution around the middle rock layer is not related to the length of the pile. Only the side resistance around the floor rock layer is related to the length of the pile and the load value. The curve of load vs displacement of the middle rock layer is parabolic shape, and there is an obvious inflection point in the load-displacement curve. The vertical displacement of the middle rock layer grows with the increase of the length of the pile and the decrease of the thickness of middle rock layer. The greater the diameter of the pile, the greater the
出处
《工程地质学报》
CSCD
北大核心
2017年第6期1565-1565,共1页
Journal of Engineering Geology
