通过开展3组不同桩锚结构(普通抗滑桩、锚杆抗滑桩)加固黄土滑坡的模型试验,测得不同桩锚模型的土体抗力、桩身弯矩及锚杆的应变,对不同结构形式的锚杆抗滑桩的受力形式、内力分布及破坏模式进行对比分析。结果表明:黄土滑坡防治中,锚杆抗滑桩受力结构呈“S”曲线状,桩顶位移平顺延续,土体抗力及桩身弯矩分布更均匀;增加桩顶锚杆排数,可以增大抗滑力;普通抗滑桩的破坏模式主要为塑性单铰破坏,锚杆抗滑桩主要为塑性单铰(或双铰)破坏,锚杆主要为弯剪-滑移破坏,桩周土主要为土拱塑性破坏。研究结果可为黄土滑坡防治中锚杆抗滑桩的设计理论提供技术支撑。
Abstract
The stress form, internal force distribution and failure mode of anti-slide anchor piles of different structures are compared and analyzed by measuring the soil resistance, bending moment of piles body and the strain of anchor in three model tests of reinforcing loess landslide by different pile-anchor structures (common anti-slide pile and anti-slide anchor pile). Results show that 1) in the prevention and control of loess landslide, the stress of anti-slide anchor pile displays an "S" shape, and the displacement of pile top is smooth and continuous, and the distributions of soil resistance and bending moment of pile body are more uniform; 2) increasing the number of anchors at the top of pile could increase the anti-slide force; 3) the failure mode of common anti-slide pile is mainly plastic single hinge damage, while that of anti-slide anchor pile is mainly single hinge (or double hinges) damage; the main failure of anchor is bending-shear slip damage, and that of the soil around pile is mainly plastic failure of soil arch. The research results provide technical support for the design theory of anti-slide anchor pile in loess landslide prevention and control.
关键词
锚杆抗滑桩 /
普通抗滑桩 /
模型对比试验 /
黄土滑坡 /
破坏模式
Key words
anti-slide anchor pile /
common anti-slide pile /
comparative model test /
loess landslide /
failure mode
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基金
中国地质调查局二级项目(DD20160278);中国地质调查局工作项目(1212011220171,1212010914021)
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