Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

Abstract

In the construction of high dams, many high rock slope failures occur due to flood discharge atomized rain. Based on the steel frame lifting technique and strength reduction materials, a comprehensive method is proposed in this paper to study the stability of high bedding rock slope subjected to atomized rain. The safety factor expression of the comprehensive method and the evaluation method for deformation instability were established according to the similarity theory of geomechanical model, failure criterion, and mutation theory. Strength reduction materials were developed to simulate the strength reduction of structural planes caused by rainfall infiltration. A typical test was carried out on the high bedding rock slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding–fracturing and fracturing–sliding. The first slip block at the exposed place of the structural plane was sliding–fracturing. Other succeeding slip blocks were mainly of the fracturing–sliding type due to the blocking effect of the first slip block. The failure sequence of the slip blocks along the structural planes was graded into multiple levels. The slip blocks along the upper structural planes were formed first. Concrete plugs had effective reinforcement to improve the shear resistance of the structural planes and inhibit rock dislocation. Finite element method (FEM) simulation was also performed to simulate the whole process of slope failure. The FEM simulation results agreed well with the test results. This research provides an improved understanding of the physical behavior and the failure modes of high bedding rock slopes subjected to atomized rain.

Analysis of swallowtail mutation instability of slope with weak interlayer under blasting disturbance

“…Due to complex geological process, there are numerous joints and weak interlayers (weak planes) inside the rock slope, which is very likely to induce the displacement of the slope along the weak layer under the action of blasting disturbance and thus further threatens slope stability [3][4][5]. The limit equilibrium analysis method (safety factor method) and the swallowtail mutation theory are advantageous methods for static analysis of slopes, of which the former is relatively mature in analyzing slope stability [6][7][8][9]. However, currently there is little research on the analysis of slope stability under the action of blasting disturbance by reasonably integrating relevant key parameter equations based on the swallowtail mutation theory.…”

Sensitivity Analysis of Anchored Slopes under Water Level Fluctuations: A Case Study of Cangjiang Bridge—Yingpan Slope in China

“…The damage of high bedding rock slopes by flood discharge of atomized rain was studied based on the slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding-fracturing (the first slip block) and fracturing-sliding (other blocks) [18]. The long-term effects of rainfall recharge and the fluctuation of groundwater weaken the rock and soil, causing creep deformation and even landslides [19].…”