锚索格构梁受力分布的现场模型试验研究

In-situ model test on force distribution of anchor rope lattice beam

通过开展锚索格构与碎石土滑坡相互作用的现场模型试验,研究了格构梁在滑坡推力作用下的受力分布规律。得到以下结论:在锚索约束力的作用下,格构梁的横梁、竖梁受力特征基本相似,节点处受力最大,靠近梁中部受力逐渐减小;在滑坡推力作用下,格构横梁最上排的变形最剧烈,受力最大,中间的一排次之,最下排受力最小,格构横梁从上往下的荷载分担比为70%~85%;在同一滑坡推力作用下,格构横梁和竖梁弯矩分布特征基本相同,节点处正弯矩最大,格构梁中部负弯矩最大,最大正弯矩是最大负弯矩的1.6~2.0倍。另外,还讨论了试验中土压力测试值误差较大的原因。

We carried out the in - situ model tests on the interaction between anchor rope lattice and the landslide of gravel soil, and by the test results we analyzed the force distribution of lattice beams under the landslide thrust. The results showed that the transverse beams and vertical beams reveal the same mechanical characteristics, namely the force is the largest at the nodes and the smallest at central part of the beams due to reinforcement of cable ropes; under the thrust of landslide, the top transverse beams displacement and force are the maximum, the middle beams are smaller and the bottom beams are the smallest, the loading sharing ratio is 70% - 85% from top to bottom of transverse beam; under the same sliding loading, the transverse beam and vertical beam have the same moment distribution that the sagging moment reaches the maximum at the nodes and the hogging moment reaches the maximum at the central part of beams, and the maximum sagging moment is 1.6 - 2.0 times of the maximum hogging moment. Finally, the cause for relatively large error of measured soil pressure is discussed.