悬臂栈道嵌固端破坏机理分析及工程实践

Analysis on Failure Mechanism of Embedded End of Cantilevered Trestle and Engineering Practice

根据不同的悬臂栈道梁端嵌固约束方式,利用Midas GTS有限元软件建立了4种模型工况,并采用有限元软件提供的强度折减法进行分析计算,得出了不同梁端嵌固约束方式下悬臂栈道的破坏模式、安全系数以及正常使用条件下梁的竖向位移。通过对4种模型工况下计算结果的分析对比,得出了梁端的合理嵌固方式,提出了锚杆设置长度与斜撑设置的原则,并将研究成果应用于工程实践中。通过工程案例的实施,论证了研究结论的合理性。鉴于现行规范无针对悬臂栈道的专门规定,提出了工程设计中依据《建筑边坡工程设计规范》的相关安全系数进行设计的建议。

Based on the different embedded constraint methods at the beam end of the cantilevered trestle,four model operating conditions are established by using Midas GTS finite element software,and are analyzed and calculated by the strength reduction method provided by the finite element software,which can give the failure modes and safety factors of cantilevered trestle under the different embedded constraint methods at the beam end,and the vertical displacement of the beam under the normal use conditions.Through the analysis and comparison of the calculation results under four operating conditions,the reasonable embedding mode of the beam end is obtained,and the principles of anchor bolt setting length and diagonal brace setting are proposed.And the research results are applied to engineering practice.The rationality of the research conclusion is demonstrated through the implementation of the project case.In view of the fact that there is no special provision for cantilevered trestle in the current code,some suggestions for engineering design are put forward according to the relevant safety factors in Code for Design of Building Slope Engineering.