Reinforcement mechanism analysis of lattice beam and prestressed anchor rod system for loess slope

Abstract

Lattice beam and prestressed anchor rod are used to enhance stability and prevent failure of soil or rock slopes. In this study, a model of Lattice beam and prestressed anchor rod (LBPAR) system was designed with reinforcement mechanisms and a model test was constructed with a circular slip surface of a loess slope. First, interaction between the loess slope and the LBPAR system was investigated by an LBPAR system analysis model. Stability of sliding mass from the sliding bed with an arc-shaped sliding surface was then studied by an experimental model designed. Finally, internal force distribution of lattice beams in the LBPAR system was investigated by using a large-scale physical model test. The results were compared to those calculated using the reverse beam method, indicating that the LBPAR system strengthened the sliding mass in space and improved the overall stability of the loess slope. With vertical loading, the axial tensile stress of the main anchor rod increases continuously. The bending area of the anchor rod was concentrated within 2 m of the sliding surface. And the maximum bending moment reaches 70 N·m. The sliding mass was subject to vertical load pressure, lattice beams’ pressure, and dead weight in the meantime and the maximum earth pressure value is near the node of the lattice beams. It is proved that such a method excels in the engineering design of loess landslides, which has promising applications in the future.

A new improved particle swarm algorithm for optimization of anchor lattice beam support structures

“…The results of the finite element analysis, the preliminary model test [21], and the optimized displacement at the top and foot of the slope are presented in Fig. 10.…”

“…In the figure, the horizontal coordinate represents the loading value in N/mm 2 . For the specific loading scheme in the existing literature [21], vertical coordinates with displacement values greater than 0 at the top of the slope depict the numerical finite element result, the model test result, and the optimization outcome of working condition 3 calculated using the improved particle swarm optimization algorithm. Displacement values smaller than 0 at the foot of the slope are also displayed in mm.…”

“…Then the IPSO is used to solve it. After introducing the penalty function, the expression of the optimization problem for the design of anchor lattice beam is as follows: (21) When solving the constrained optimization problem mentioned in Eq. ( 19), if the classical numerical method is used, the result may not meet the expectations if the calculation formula is complex and the calculation of the gradient is cumbersome.…”

Examination of Damage Evolution in Slurry Masonry Schist Subjected to Biaxial Compressive Stresses

“…Current research on slurry masonry schist slope protection has focused on the overall stability of slopes [1,2], and several scholars have established slope models through numerical simulation software to study the effects of freeze-thaw cycles, herbaceous root systems, and other factors on slope stability [3][4][5][6]. Several scholars have achieved good results by designing lattice beams and anchor cables to improve the overall stability of slopes [7][8][9][10]. Slurry masonry schist, a combination of schist and mortar, is different from ordinary concrete.…”

Influence of slope angle on deposit morphology and propagation of laboratory landslides

“…Landslides can be very destructive, especially when they runout over large distances due to high mobility 1 – 7 . Apart from field investigations, one can study their flowing behaviour via building physical models of simplified landslide geometries and carrying out laboratory experiments on them 8 – 12 .…”