微型抗滑桩双排单桩与组合桩抗滑特性研究

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Abstract The anti-sliding characteristics of single double-row and composite anti-slide micropiles are studied through three model experiments. The monitoring results of slope displacement indicate that：(1) micropiles can provide relatively bigger sliding resistance and decrease deformation rates；and it has obvious slope reinforcement effect. (2) Comparing with single double-row micropiles，composite micropiles have better reinforcement effect and the sliding resistance increases by 6.8%. There are three failure models namely bending failure of the pile body，disengaging between pile and soil and the fracture failure of piles. The crack angle of single double-row piles，with bending-tensile failure，is bigger value of 65.7°，while the value of composite piles is 33.9°， with bending-shearing failure. And the backward piles? cracks are more obvious than the forward piles. The soil pressure acting on the free section of single double-row pile body is “S” shaped distribution. The backward piles bear bigger soil pressure owing to directly contacting loads；meanwhile，the ratios of the maximum of soil pressure between the forward piles and backward piles are 0.53∶1–0.50∶1. As a result of the empty area between the pile and soil，the maximum of soil pressure distributes in 10% of the length of the pile above the sliding surface. The sliding resistance below sliding surface is inverted with triangular distribution under small pushing force and presents rectangular distribution under big pushing force. Due to the effect of coupling beam，the positive bending moment produced at the top of the forward piles is bigger；and the maximum negative moment appears around the sliding surface. The ratio of maximum negative bending moments between the backward piles and the forward piles is 0.67∶1–0.80∶1.

Key words： slope engineering model experiment micropiles composite structure micropiles failure model soil pressure

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/I7/1499

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