软岩高边坡多级框架锚杆设计计算方法

针对加固软岩高边坡多级锚杆框架现有设计计算方法的不足，基于多级框架锚杆加固边坡机理，确定不同的边坡破坏模式.在此基础上，在给定的设计安全系数下，通过分析边坡稳定性确定锚杆设计拉力；进而考虑锚杆与框架梁以及框架梁与坡体之间的相互作用，根据静力平衡和变形协调关系并采用Winkler地基模型计算梁的设计内力；由此建立了多级框架锚杆的一种新的设计计算方法，并通过室内模型试验验证了所提方法的合理性.研究结果表明，作用于各级坡框架梁的坡体压力，整体上具有“中间大，两端小”的抛物线型分布特点. 

Design Method for Multi-frame Beams with Anchor Bolts Used to Stabilize High Soft-Rock Slope

In order to avoid the disadvantages of the existing design methods for multi-frame beams with anchor bolts used to stabilize high soft-rock slopes, a novel design method was proposed on the basis of interaction mechanism between a structure and a slope. With the proposed method, tensile forces of anchor bolts are determined by analyzing slope stability in terms of design safety factor and failure mode of a slope, and then internal forces of frame beams are calculated from static equilibrium and deformation compatibility conditions between anchor bolts and frame beams and the Winkler foundation model used to interpret interaction between frame beams and a slope. The method was verified by a laboratory model test. The research results show that the distribution mode of slope pressure on every frame beam is a parabola in the direction of the longitudinal axis.