Water-rich loose and broken coal and rock mass grouting solidification experimental device and effect evaluation method

Abstract

The invention provides a water-rich loose and broken coal and rock mass grouting solidification experimental device and an effect evaluation method. The water-rich loose and broken coal and rock massgrouting solidification experimental device comprises an experimental cavity formed in a steel structure kettle body, a circulating water pressure loading system communicating with a confining pressure loading system, a grouting system communicating with the confining pressure loading system, an ultrasonic testing system and an electrical resistivity tomography system, wherein the ultrasonic testing system and the electrical resistivity tomography system are connected to the experimental cavity; and the water pressure and chemical grout are input into the experimental cavity of a stratum model, thus the coal measure stratum wave speed, dynamic mechanical parameters and electrical resistivity information in the experimental cavity in the grouting process are monitored in real time through the ultrasonic testing system and the electrical resistivity tomography system, and the water-rich loose and broken coal and rock mass grouting reinforcing effect is evaluated. Multi-field physical evolution law simulation tests in the chemical grouting process in water-rich loose and broken coal and rock mass and the grouting effect are quantitatively evaluated, and the scientific basis is provided for loose and broken coal and rock mass grouting reinforcing parameter determination and effect test evaluation of underground engineering.

Description

technical field [0001] The invention relates to an experimental device for grouting consolidation of water-rich loose and broken coal and rock mass in a coal mine and an effect evaluation method, which can better simulate the grouting consolidation process and effect evaluation of underground water-rich loose and broken coal and rock mass in a coal mine. It belongs to the field of mine disaster prevention and control. Background technique [0002] The hydrogeological conditions of my country's coal mines are complex. During the construction and mining of western coal mines, unfavorable (harmful) coal-measure strata such as water-rich sandstone aquifers, Ordovician limestone layers, faults, quicksand layers, and even collapse columns are often encountered. Roof collapse, slabs, and roof fall occur, and the excavation construction conditions deteriorate and become more difficult. At the same time, the joints, mining cracks, and unfavorable geological structures in the coal and ...

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Problems solved by technology

However, due to the limited exploration data of general coal measure strata and the complexity of engineering geological structure, the grouting reinforcement construction technology mostly relies on traditional experience; the grouting reinforcement treatment of underground water gushing sand is mostly hidden projects, and there are certain limitations in the detection and evaluation of grouting effects. difficulty

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