Abstract
Blasting excavation of a bedding rock slope is a common problem in highway construction in mountainous areas. Accurate simulation of damage area caused by blasting excavation is of great significance for the subsequent maintenance of slopes. Based on a highway construction project in Guangdong province of China, a tensile and compressive damage model was used to simulate the whole process of blasting excavation of a typical bedding rock slope. The analysis results show that damage first appears just around the blasting hole and then develops to the both sides and the bottom of the blasting hole, and finally a large range of damage appears in the lower part of the blasting hole, and the damage depth on the right-side slope is around 2 m, which is in consistent with the scene. Besides, damage also occurs in the middle of the bedding rock mass of the slope. At the same time, the history analysis of vibration velocity also indicates that tensile failure appears on the right-side slope under the blasting hole. Therefore, the stability of the slope can be assessed by analyzing the distribution of damage factors and the vibration velocity characteristics synthetically. In addition, parameter analysis was also carried out to optimize the blasting design by controlling the blasting load so as to obtain the ideal blasting excavation effect and ensure the stability of the slope under blasting load.
Highlights
During the construction of highways, it is inevitable to encounter various complicated geological conditions, such as the excavation of rocky high slopes
Results and Discussion e distribution and development law of damage factors in rock mass under blasting load was analyzed, as well as the diffusion characteristics of rock mass vibration velocity. e blasting mechanism of the rock mass slope and the influence of blasting excavation on the stability of the rock mass slope were analyzed and discussed in combination with the practical project corresponding to the numerical model
The whole process of a typical rock slope blasting excavation is simulated by using a plastic model of tensile and compressive damage, and the slope stability is assessed by analyzing the damage factors and vibration
Summary
During the construction of highways, it is inevitable to encounter various complicated geological conditions, such as the excavation of rocky high slopes. Li et al [13] used numerical analysis methods to study the blasting load, rock damage characteristics, and peak particle velocity (PPV) attenuation law and obtained a simple method based on the safety threshold of rock vibration velocity to limit the damage depth of rock mass during blasting excavation. Is model is a continuous, plasticbased rock damage model It assumes that the rock mass material is mainly destroyed by tensile cracking and compression fracture, and the evolution of the yield or failure surface is controlled by two hardening variables (εpt l and εpcl), which represent the tensile and compressive equivalent plastic strain, respectively. Variable d is considered as a damage factor of the material, which is used to assess the dynamic damage characteristics of a typical bedding rock slope under blasting load in the numerical analysis of this paper
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