拼装式锚杆(索)框架结构力学特征数值模拟与试验研究

Numerical Simulation and Experimental Study on Mechanical Features of Assembled Anchor (Cable) Frame Structure

为快速治理灾后边坡病害,研发了2种新型拼装式锚杆(索)框架结构。通过数值模拟进行比选,可知横梁为单向变截面矩形梁时,拼装式锚杆(索)框架在应力分布、变形协调及施工难度上优于横梁为单向变截面倒T形梁时。对优选框架在全风化砂岩边坡的力学分布特征进行数值模拟,结果显示,框架在节点处弯矩和剪力最大,锚固点下部土体在集中力作用下发生较大沉陷变形,跨中部位出现挤压变形。现场试验表明,框架在节点处出现破坏。由数值模拟和现场试验结果可知,框架结构可以满足一般锚固工程对反力构件承载能力的要求。

Two newtypes of assembled anchor( cable) frame structure were developed for the rapid treatment of slope disease after natural disaster.Through the numerical simulation, it can be seen that the mode of unidirectional variable cross-section rectangular beamof cross beamis better than inverted T-shaped beamof cross beamin stress distribution,deformation compatibility and construction difficulty. Mechanical distribution features of preferred frame were simulated in completely weathered slope.Fromsuch an analysis,t he maximumbending moment and shear force of assembled anchor( cable) frame appear on the junctions. Soil under anchoring point has larger subsidence deformation under the action of concentrated force.The extrusion deformation occurs on the middle span of soil.The field tests showthat the destruction of assembled anchor( cable) frame occurs on the junctions.Numerical simulation and field tests showthat assembled anchor( cable) frame could meet the requirement of bearing capacity of the reaction components in common anchor( cable) engineering.