High-strength anchoring and injection-integrated pressure relief and roadway retention method for deep wells and extremely soft rock roadways

Abstract

This invention discloses a high-strength anchoring-injection integrated pressure relief method for deep-well extremely soft rock roadways, belonging to the field of deep-well coal mining technology. The method includes the following steps: before roadway excavation, determining whether the surrounding rock is engineering soft rock and establishing a mechanical analysis model for the deep-well extremely soft rock roadway; designing high-strength anchoring and determining the high-strength anchoring parameters for the roof and floor; during the roadway excavation stage, testing the high-strength anchoring construction effect, evaluating the effect of the high-strength anchoring on the surrounding rock, and optimizing the high-strength anchoring design; using the lithology of the surrounding rock after high-strength anchoring obtained from the tests to optimize the mechanical analysis model of the deep-well extremely soft rock roadway; and before the working face is mined, conducting an integrated pressure relief design for the roadway surrounding rock. This method can solve the problem of high difficulty in controlling the surrounding rock in deep-well extremely soft rock formations without coal pillars. It controls the deformation of the surrounding rock through high-strength anchoring and optimizes the stress on the roadway surrounding rock through dense drilling and high-pressure gas directional fracturing pressure relief technology, thereby achieving roadway surrounding rock control.

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