Abstract
In order to explore the monitoring and control method of rock slope, indoor physical model testing of collapse control and monitoring were carried out with the example of a rock slope collapse area project in Jietai Temple in Beijing, China, as the prototype. Based on the similarity theory, in this study, a new structural support with Negative Poisson’s Ratio bolt and flexible anchored net was utilized to reinforce the rock slope. Following a graded loading sequence, the collapse failure characteristics and the overall control effect of energy absorption reinforcement measures were explored. The experimental results demonstrated that the entire process of slope collapse presented four distinct stages of failure: fracture generation, fracture propagation, partial collapse, and overall collapse. The full-field displacement nephogram and the displacement monitoring point of the collapse area indicated that the large deformation and failure of the collapsed surrounding rock were effectively controlled, while the Negative Poisson’s Ratio bolt and the flexible anchored net had good reinforcement effects. The experimental stress record presented that the change of pressure curve was an apparent regularity in the entire process of slope collapse, which reflects the change state of internal force of surrounding rock; it includes the function of monitoring of slope collapse. It was indicated that the Negative Poisson’s Ratio bolt along with the large-deformation flexible anchored net had good reinforcement monitoring effect on the rock slope collapse disaster.
Highlights
Under the effects of rainfall, earthquake, and weathering, the strength of rock mass becomes weak, causing the engineering collapse [1,2,3,4], which was extremely destructive and with high potential for dangers of tunnel, roadway, and slope [5,6,7,8,9]. e failure of rock slope with multijoints was a kind of prominent geological hazards; its failure mode is complicated, and the treatment is difficult [10,11,12]
Physical model tests and pressure sensor and displacement nephogram analyses were carried out to investigate the effects of NPR bolt system, characteristics of collapse, and monitoring of rock slope
(2) e displacement nephogram of the slope and the displacement change trend of the monitoring points show that the displacement increases the most in the fracture propagation stage, but the surrounding rock did not collapse in an instant. en, the displacement increased slowly until the whole slope collapsed
Summary
Under the effects of rainfall, earthquake, and weathering, the strength of rock mass becomes weak, causing the engineering collapse [1,2,3,4], which was extremely destructive and with high potential for dangers of tunnel, roadway, and slope [5,6,7,8,9]. e failure of rock slope with multijoints was a kind of prominent geological hazards; its failure mode is complicated, and the treatment is difficult [10,11,12]. E treatment method of slope collapse was mainly based on bolt and bolt-shotcrete support; its materials are all common rebar It has the low deformation characteristics which are difficult to meet the safety requirements of slope treatment. On the basis of field application, we carried out the physical model test, the deformation characteristics were studied under the condition of the new support system, and the improved supporting measures and monitoring methods were put forward, which provided a theoretical reference for the comprehensive prevention and control of the multijoint slope. E construction and design of the model test can better simulate the structural characteristics of the surrounding rock of the slope and greatly enhance the authenticity of the physical model test, which is of representative significance for the study of the slope collapse support in the Jietai Temple area Is geological section reflects the typical characteristics of the surrounding rock of the slope in the area around Jietai Temple. e surrounding rock has obvious joint fissures, and the slope is in an unstable state with potential danger of collapse. e construction and design of the model test can better simulate the structural characteristics of the surrounding rock of the slope and greatly enhance the authenticity of the physical model test, which is of representative significance for the study of the slope collapse support in the Jietai Temple area
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