Abstract
In order to study the fracture ability classification of rock mass under the cracking action of supercritical CO2 phase transition, based on the classification theory of rock mass in blasting engineering, an analytic hierarchy process (AHP)-entropy weight method (EWM) and the cloud model classification method for rock mass cracking under CO2 phase transformation are proposed. In this method, rock density, rock tensile strength, rock wave impedance, and rock mass integrity coefficient are used as the factors to determine the level of rock mass fracturing, and the evaluation index system of rock mass fracturing is established. Through this evaluation method, the rock mass in a reconstruction project section of Nyingchi, Tibet, is classified and evaluated. The results present that this new classification method of rock mass fracture ability uses AHP–EWM to carry out the weight distribution of the classification index. In addition, it is combined with the cloud model for the classification division, overcoming the traditional classification method fixed with appraisal pattern flaw. Therefore, it has validity and feasibility. According to the characteristics of fracture ability, the rock masses in the area to be rebuilt on the Tibet Highway are divided into grade II, grade III, and grade IV, which provides scientific guidance for the construction of the project.
Highlights
At present, blasting is still the most important means of rock crushing excavation in open pit mining and underground engineering construction
On the basis of the theory and idea of explosive classification of rock mass and considering the characteristics of rock breaking caused by CO2 phase transformation, this paper proposes a rock mass fracture ability classification evaluation method based on analytic hierarchy process (AHP)–entropy weight method (EWM) and the cloud model and evaluates the fracture ability of the rock mass of a reconstruction project in Milin County, Tibet. is method provides a reliable reference for the safe and effective construction of the project
Classification Method of AHP–EWM and the Cloud Model. is paper introduces a classification method based on the analytic hierarchy process (AHP)–entropy weight method (EWM) and cloud model, which can classify the difficulty of rock mass fracture under CO2 phase change fracture. is method first assigns subjective and objective weights to the selected rock mass fracturing grading evaluation indicators through the analytic hierarchy process and the entropy weight method and optimizes the weights through the Lagrange multiplier method to obtain the combined weight of each factor in the classification of rock mass fracturing in the whole classification process
Summary
At present, blasting is still the most important means of rock crushing excavation in open pit mining and underground engineering construction. In the research of CO2 phase change fracturing and rock breaking, in order to ensure efficient fracturing of the target rock mass, it is necessary to carry out the fracture grading evaluation for various target rock masses existing in different geological environments, which can help in the parameter design and crack scheme optimization. There is no relevant classification evaluation standard for rock mass cracking in the CO2 of phase change fracturing and rock breaking at home and abroad. On the basis of the theory and idea of explosive classification of rock mass and considering the characteristics of rock breaking caused by CO2 phase transformation, this paper proposes a rock mass fracture ability classification evaluation method based on AHP–EWM and the cloud model and evaluates the fracture ability of the rock mass of a reconstruction project in Milin County, Tibet. On the basis of the theory and idea of explosive classification of rock mass and considering the characteristics of rock breaking caused by CO2 phase transformation, this paper proposes a rock mass fracture ability classification evaluation method based on AHP–EWM and the cloud model and evaluates the fracture ability of the rock mass of a reconstruction project in Milin County, Tibet. is method provides a reliable reference for the safe and effective construction of the project
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