基于均布条形荷载附加应力理论的抗滑桩桩间土拱效应研究  

Soil Arch Effect Between Anti-sliding Piles Based on the Theory of Uniform Strip Load Additional Stress

作　　者：屈林河 屈俊童 谢清荣 QU Linhe;QU Juntong;XIE Qingrong(Yunnan Institute of Urban and Rural Planning and Design,Kunming,Yunnan 650228,China;School of Architecture and Planning,Yunnan University,Kunming,Yunnan 650504,China)

机构地区：[1]云南省城乡规划设计研究院,云南昆明650228 [2]云南大学建筑与规划学院,云南昆明650504

出　　处：《水利与建筑工程学报》2020年第5期175-179,共5页Journal of Water Resources and Architectural Engineering

摘　　要：抗滑桩桩间距确定是滑坡治理设计中的重要参数,其决定着桩间土拱效应的强弱变化。而土拱效应是保证桩间土体不从桩间滑出或绕桩滑动的关键因素,是确保抗滑桩安全有效的重要原因。将抗滑桩对滑坡的反力视为均布条形荷载,利用半无限空间范围内条形荷载附加应力理论,求解土体中任一点M在x方向的附加应力,结合对应的模型试验,从而确定了抗滑桩桩间土拱效应的拱高约为0.3~0.4倍桩间距。且通过附加应力随桩间距的变化可以发现,抗滑桩桩间距为4倍以内桩截面宽度时土拱受力较为有利,既采用3~4倍桩截面宽度作为设计桩间距较为经济、合理。The determination of anti-slide pile spacing is an important parameter in landslide control design,which determines the change of soil arch effect between piles.The soil arching effect is the key factor to ensure the soil between the piles does not slide out from the piles or slide around the piles,and it is the most important reason to ensure the safety and effectiveness of anti-slide piles.Focusing on the reaction of anti-slide pile to landslide as uniform strip load,and the theory of subsidiary stress of strip load in semi-infinite space was adopted to solve the additional stress of M at any point in the soil in the x direction and combined with corresponding model tests.The results showed that the arch height of soil arch effect between anti-slide piles is about 0.3~0.4 times of pile spacing.And the soil arch bears the most favorable force when the spacing of anti-slide piles is within 4 times of the width of pile section through the change of additional stress with pile spacing.In other words,it is more economical and reasonable to use 3~4 times of pile section width as design pile spacing.

关 键 词：抗滑桩桩间距 土拱效应 条形荷载 附加应力 

分 类 号：TU473.1[建筑科学—结构工程]