A loading method of shotcrete support sprayed layer in large-scale simulated roadway

Abstract

The invention discloses a large-size simulated roadway shotcrete supporting shotcrete layer loading method to realize uniform roadway stress. A composite structure is adopted, uniform roadway stress is realized by volume expansion of expansive materials, and a retardant, a cementing reinforcing agent and an expansion reinforcing agent are added into the materials. The retardant realizes control of hydration reaction time of the materials; the cementing reinforcing agent makes the materials a complete elastomer to realize uniform roadway stress; the expansion reinforcing agent is capable of increasing material volume expansion pressure to guarantee experiment required pressure. By the method, uniform roadway stress can be realized, and real conditions of the underground roadway stress can be simulated precisely to provide accurate bases for researches on roadway deformation and destruction and roadway supporting.

Description

technical field [0001] The application relates to a large-scale simulated roadway sprayed concrete support and sprayed layer loading method using expansive materials. Background technique [0002] Roadway surrounding rock deformation and failure is a phenomenon of coal and rock mass stress in underground engineering such as coal mining, and it is also one of the main factors affecting the safety of mine structures. The frequency and hazards of surrounding rock deformation and failure are becoming more and more serious. The research on its deformation and stress failure characteristics and roadway support generally adopts numerical simulation and similar material simulation at home and abroad. Compared with similar material simulation experiments, numerical simulation is not as intuitive and abstract as experiments, and it is difficult to determine the parameters of numerical simulation, and the accuracy is difficult to guarantee. The traditional similar material simulation ...

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Problems solved by technology

Compared with similar material simulation experiments, the intuitiveness of numerical simulation is not as good as that of experiments, it is more abstract, and it is difficult to determine the parameters of numerical simulation, and the accuracy is difficult to guarantee

The traditional similar material simulation experiment simulates the loading of the roadway, which is generally realized by adding a hydraulic jack system to the periphery of the roadway. However, the hydraulic system is used to pressurize the roadway, and the load on the roadway cannot be uniform, resulting in damage to the force. Large errors in characteristic studies, also for shotcrete roadways

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