不同截面型式抗滑桩加固边坡数值分析  

Numerical analysis of slope reinforcement with different cross-section anti-slide piles

作　　者：年廷凯[1,2] 徐海洋[1,3] 李东晨[1,4] 

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]深圳冶建院建筑技术有限公司,广东深圳518054 [4]中国电力工程顾问集团中南电力设计院,湖北武汉430071

出　　处：《大连理工大学学报》2013年第5期695-701,共7页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51179022);中央高校基本科研业务费专项资金资助项目(DUT12LK19)

摘　　要：当前国内外抗滑桩主要采用圆形和矩形两种截面型式,而不同型式抗滑桩加固边坡的效果不同,施工方法和工程造价亦不同.为此,针对T形、正方形、矩形、正五边形、正六边形、圆形等6种不同截面型式的抗滑桩,采用弹塑性有限元强度折减法,计算了边坡岩土体在强度折减系数分别为1.35和1.50时6种桩型抗滑桩的桩身内力反应,并进行了加固效果的对比分析;在此基础上,深入研究了抗滑桩-边坡体系的整体稳定性及桩间的土拱效应.结果表明,抗滑桩加固潜在滑移坡体时,在特定桩间距范围内会产生土拱;不同截面型式抗滑桩引起的土拱形状不同,桩间的土拱现象在一定程度上能够反映不同桩型抗滑桩的作用机制和加固效果.In the current practice, anti-slide piles are mainly designed in the form of circle and rectangle at home and abroad. However, the slope stabilization effects using the anti-slide piles with different forms of cross sections are completely different, and cross-section forms of stabilizing piles also affect the construction technology and the project cost. So elasto-plastic finite element method （FEM） combined with strength reduction technique is employed to investigate the reinforcing effects of different cross-sections of piles, such as T-shaped, square, rectangle, pentagon, hexagon and circular cross-sections, the stability of slope-pile systems and the internal forces of piles are also calculated when the strength reduction factor is equal to 1.35 and 1.50, respectively. Moreover, the soil arching between the adjacent two piles is further investigated. The experimental results show that when the anti-slide piles are used to stabilize a potential instability slope, soil arching phenomena will be made in certain pile spacing. Different cross sections for anti-slide piles lead to different shapes of soil arching. The soil arching can reflect the working performance of anti-slide piles and load transfer mechanism for a slope-pile system to a certain extent.

关 键 词：边坡-抗滑桩体系 桩截面 有限元强度折减法 土拱效应 

分 类 号：TV223.22[水利工程—水工结构工程]