含刚性抗滑桩的土质边坡三维稳定性分析  

3D Stability Analysis of Soil Slope with Rigid Anti-slide Pile

作　　者：仇宇霞 秦忠国[1] 张峰 丁灵龙 QIU Yu-xia;QIN Zhong-guo;ZHANG Feng;DING Ling-long(College of Mechanics and Materials, Hohai University, Nanjing 211100, China)

机构地区：[1]河海大学力学与材料学院,南京211100

出　　处：《科学技术与工程》2020年第16期6593-6598,共6页Science Technology and Engineering

摘　　要：抗滑桩是常用的边坡加固方法,但由于桩-土相互作用的复杂性,难以用经典方法计算边坡稳定性和桩位、桩长、桩距。采用强度折减法,对抗滑桩加固的三维非均质边坡进行弹塑性分析和破坏过程模拟,得出边坡的稳定安全系数和潜在滑动面,在此基础上进一步研究了桩位和桩长、桩距对边坡稳定的影响。研究表明:在潜在滑动面进行布桩时,抗滑桩与坡脚间水平距离为未加固边坡潜在滑动面水平距离的2倍时,稳定安全系数达到最大;抗滑桩嵌入稳定深层的长度宜为2/3倍桩长;三维稳定性分析能有效观察到排桩间的土拱效应,当桩间距为4倍桩径时,桩间土拱起到了较好的阻滑作用。Anti-slide pile is a commonly used method for slope reinforcement.It is difficult to calculate slope stability,pile location,pile length and pile spacing by classical method because of the complexity of pile-soil interaction.The strength reduction method was used to analyze the elastic-plastic behavior of the 3D heterogeneous slope strengthened by anti-slide piles and simulate the failure process.The stability safety factor and potential sliding surface of the slope were obtained.On this basis,the influence of pile position,pile length and pile spacing on the stability of the slope was further studied.The research results show that the stability safety factor reaches the maximum when the piles are inserted in where the horizontal distance between anti-sliding pile and foot of slope is twice the horizontal distance of potential unreinforced sliding surface’s depth when laying piles on the potential sliding surface.The optimum stabilizing depth for the pile in heterogeneous soils can be chosen to be 2/3 pile length.The 3D stability analysis can effectively observe the soil arching effect between rows of piles.The soil arching plays a better role in preventing sliding when the pile spacing is 4 times the diameter of piles.

关 键 词：强度折减法 抗滑桩 稳定安全系数 非均质土 

分 类 号：TU473.1[建筑科学—结构工程]