大直径锚盘变形的荷载传递分析法

根据锚锭板、钢绞线与水泥土的相互作用机理,以弹性力学为基础,建立了拉拔荷载下三者的受力平衡方程。锚锭板受力采用弹性半空间的Boussinesq解,钢绞线握裹力采用忽略水泥土体的无旋应变下的变形协调平衡方程,并以三者的协调变形为前提,利用传递矩阵方法,计算了土层中大直径锚杆内各锚锭板所受荷载和位移的关系。通过理论计算可知,靠近张拉荷载的锚锭板最先达到塑性,而后是距离较远的发挥其承载力,如果进一步考虑钢绞线握裹力的影响,当近张拉端锚锭板达到塑性时,较远处锚锭板构件承载力的发挥程度将进一步减小。

Load Transfer Analysis Method for Deformation of Large Diameter Bolt

Based on elastic mechanics, the interaction equation for anchorage plates, steel strand and cement-treated soil under drawing load was deduced. With Boussinesq solution of elastic half space and deformation compatibility equations of irrotational strain, both anchorage plates and steel strand have their own stress analytical solution. Then the analytical solution of force and deformation for anchorage plates, which can be derived from the transfer matrix method, can be solved through those solutions and the coordinate deformation condition. According to the force-deformation solution, the anchorage plate, which is next to the drawing load, will reach its elastic-plastic state first. If taken steel strand into account, the other anchorage plates have even less pressure when the nearest one reaches its plastic state.