板连式束筋微型抗滑桩群加固滑坡机制及计算理论研究

项目名称： 板连式束筋微型抗滑桩群加固滑坡机制及计算理论研究

项目编号： No.51278430

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 肖世国

作者单位： 西南交通大学

项目金额： 80万元

中文摘要： 板连式束筋微型抗滑桩群是指数根微型桩在顶部用钢筋混凝土板连接的轻型组合抗滑结构，微型桩为在直径110～150mm孔中用几根钢筋组成束筋作骨架再在其周围注入砂浆的长细比极大的细长桩体。具有施工灵活、安全快捷、低碳环保等优点，适于中小型滑坡及边坡治理。但其加固滑坡的力学机制和计算理论还未合理建立，极大限制了其广泛使用。本项目对此问题开展研究，旨在为类似的微小直径细长抗滑桩组合结构提供共性科学理论基础。主要内容包括：考虑单元微型桩群中各细长桩与周围岩土体接触面的力学性质，揭示二者间力学作用机制，含桩侧法向挤压和切向摩擦作用；确定单元微型桩群中桩间岩土体的空间应力传递和扩散规律，包括沿坡体走向和滑动方向；探讨同时考虑细长桩群桩效应和滑带土应变软化效应的桩侧坡体压力作用规律；确立顶板力学作用机制，建立适于不同滑坡特征的单元微型抗滑桩群合理结构型式及计算方法。本研究应用前景广泛，有重要理论与实践意义。

中文关键词： 微型抗滑桩群；应变软化；空间应力传递；坡体极限推力；结构分析

英文摘要： Combined anti-sliding micro-pile group is a light retaining structure with several micro-piles connected by a reinforced concrete plate at their top. The micro-pile is highly slender pile with 110-150mm diameter of hole in which one to three steel rods surrounded by cement grout are arranged. The structure can be constructed conveniently, quickly and safely, and be helpful to environmental protection, which is very suitable for moderate and small slope or landslide treatment. However, mechanism and analytical theory of the structure can still not be established, which restricts its extensive application to a great extent. The project aims at this question so as to establish general scientific theories for such structures that are combinations of slender anti-sliding micro-piles. The main research contents involve in interaction mechanism between every micro-pile and soil surrounding it inside a unit of the combined structure with normal and tangential mechanical characteristics of the interface considered, laws of stress transmission on the slope strike and slip direction of the soil between micro-piles inside a unit, distribution pattern of lateral pressure on every micro-piles inside a unit with slender pile group effect and strain softening effect considered simultaneously, and mechanical principle of the pla

英文关键词： Combined anti-sliding micro-pile group；Strain softening；Stress transmission in space；Net limiting force on piles；Structure analysis