双排抗滑桩滑坡推力分配影响因素分析

以作用形式较为简单的双排悬臂抗滑桩(未带连梁)为模型并基于结构力学位移法得出的双排桩滑坡推力传递分配计算公式为基础,结合推力较大的红石包滑坡作为工程实例,分别分析了双排桩静排距,前后排桩的截面尺寸和桩间土弹性模量对推力传递分配的影响,得出了以下结论:(1)当增大后排桩的刚度或减小前排桩的刚度时,桩土相互挤压作用越小, A2/A1随之减小,反之A2/A1增大。(2)增大排距b时,A1减小,A2在b=3~10m时逐渐减小,但是变化幅度不大; 在b=10~21m时,不断增大。(3)当增大桩间土弹性模量时,A2增大。(4)随着前排桩截面高度的增大,A1、A2逐渐增大; 随着后排桩截面高度的增大,A1、A2逐渐减小。

ANALYSIS OF FACTORS AFFECTING DISTRIBUTION OF LANDSLIDE THRUST FORCE FOR DOUBLE-ROW ANTI-SLIDE PILES

This paper takes the basic form of double-row cantilever beam anti-slide piles without joist as the model.Based on structural analysis theory,it presents the equations for calculating the transferring push force and the distribution between the double-row piles..It further uses the Hongshibao landslide as a case study for analyzing the double-row pile static row spacing,the section size of back and front piles,and the soil elasticity modulus between piles.It examines their influences to the thrust force distribution.Conclusions from the examination are obtained as follows: (1)When either the rigidity of the back pile increases or the rigidity of the front piles decreases,the extrusion interacting force between the soil and the two-row piles decreases,A2/A1 decreases along with it.Otherwise A2/A1 increases.(2)When the row distance b increases,A1 decreases,A2 decreases gradually when b=3 to 10m; A2 increases when b=10 to 21m. (3)When increases the elasticity coefficient between piles,A2 increases.(4)Along with the increases of the section high of the front piles,both A1 and A2 increases gradually; along with the increases of the section high of the back piles,both A1and A2 decreases gradually.