四川大学学报：工程科学版2012，Vol.44Issue(2)：1-8,8.
微型桩群加固边坡受力特性离心模型试验研究
Centrifugal Model Test Research on Mechanical Characteristics Micropile Groups Reinforcing Slope
摘要
Abstract
With clay as the slope medium and soil pressure cell,displacement meter,strain foil as the integrated test facility,a series of model tests of micropiles and slopes were carried out.The control mechanism,soil pressure and bending moment of the micropiles for slope reinforcement were studied.The test results showed that the horizontal displacement of slopes with micropiles reinforced is smaller than that of the bare slope,and the smaller the pile spacing,the smaller the horizontal displacement of slope.In the slope model with micropiles reinforced,pile lateral earth pressure on the leading row micropiles gradually decreases with time,the whole earth pressure increases along the depth direction,pile lateral earth pressure-time curve on the rear row micropiles and the leading row has some similarities.At the beginning of test,the slope earth pressure generated by the rear row of micropiles to bear a large proportion in the leading row of micropiles,with the trial,the leading row micropiles will gradually increase the proportion of soil pressure bearing,at the end of test,the ratio of soil pressure acting on the micropiles,in the model with pile spacing of 2.0 cm,between the leading row and rear row is 1∶0.8,and the ratio is 1∶0.6 in the model with pile spacing of 3.0 cm,the greater the pile spacing,the earth pressure on the leading row micropiles assumed greater.The bending moment on the pile is complicated nonlinear relationship with time,the bending moment value decreases monotonically from positive to negative,the changes in the gradient moment decreases with time;the max positive bending moment on the leading row micropiles is 9.5 cm of piles,the maximum negative moment occurs at the bottom of 12.5 cm position,the max positive bending moment and maximum negative moment on the rear row micropiles occurs at the 7.5 cm,5.0 cm.The bending moment range 5.0~10.0 cm depth creates a rapid change within the soil as the slope of the sliding band.关键词
边坡/微型桩群/离心模型试验Key words
slope/micropiles/centrifugal model test分类
建筑与水利引用本文复制引用
朱宝龙,陈强,巫锡勇..微型桩群加固边坡受力特性离心模型试验研究[J].四川大学学报：工程科学版,2012,44(2):1-8,8.基金项目
国家自然科学基金资助项目（40772174 （）
41172261） （）
四川省科技支撑计划资助项目 （）
