通过开展2种距径比下微型组合抗滑桩加固碎石土滑坡室内物理模型试验，分析微型组合抗滑桩的受力变形特点，研究距径比对微型组合抗滑桩整体抗滑性能的影响。试验结果表明①微型组合抗滑桩结构受力变形可分为3个阶段(无变形阶段—阶段—性破坏阶段);②桩顶位移超过总桩长的3.6%，微型组合抗滑桩就进入塑性破坏阶段;③桩顶连系梁有效约束了桩体位移，使得微型组合抗滑桩各排桩在位于滑面以上约l₂/8处(l₂为自由段长度)出现反弯点，且滑面以上l₂/5、以下l₁/10(l₁为嵌固段长度)范围内的桩身弯矩较大，且最大弯矩位于滑面以上l₂/20处;④距径比较小(即7.5)时，微型组合抗滑桩对桩间土体的“楔紧”作用较强，抗滑桩能承受更大的滑坡推力作用。

Physical model test of landslide body containing gravel and soil reinforced by the micro-pile composite structure was carried out under two ratios of spacing to diameter. Deformation of the structure was analyzed for acquiring the influence of ratio of spacing to diameter on the anti-slide performance. The test results show that deformation of the structure can be divided into three stages no deformation stage , elastic anti-slide stage, and the elastic-plastic failure stage; then, when displacement at top of the pile exceeds 3.6% of the length of the pile, the structure enters the phase of plastic failure; subsequently, beams at the top of the pile effectively constrain displacement of the pile, so that inflection point occurred at the height of l₂/8 measured upward from slip surface, where l₂ is the freedom length of the pile; moreover, the bending moment of pile was larger when the location is at the height of l₂/5 above slip surface and l₁/10 below the slip surface, where l₁ is the embedded length of the pile, and the maximum bending moment is located at the height of l₂/20 above slip surface; finally, as ratio of spacing to diameter is less than 7.5, wedging effect of soil on micro-pile composite structure is stronger and the pile can withstand greater landslide thrust.