Method for monitoring dynamic height of overlying strata damage in underground coal seam mining

Abstract

The invention discloses a method for monitoring the dynamic height of overlying strata damage in underground coal seam mining, which specifically comprises the following steps of S1, selecting and customizing a mining overlying strata deformation monitoring sensing optical fiber, and calibrating the performance indexes of the sensing optical fiber; S2, analyzing the coupling effect and the deformation coordination of the optical fiber and a rock-soil body, and correspondingly optimizing the installation process of a drilling backfill material and the sensing optical fiber; and S3, establishinga coal seam mining overlying strata deformation damage distributed optical fiber monitoring system to monitor the dynamic height of overlying strata damage in underground coal seam mining. A coal mining overlying strata deformation damage dynamic monitoring method based on the distributed optical fiber sensing technology is established, a new method and a new technology are provided for coal development geological disaster prevention and control, an optical fiber- rock-soil body interface mechanical transmission model is constructed by analyzing sensing optical fiber-surrounding rock deformation consistency, a monitoring error range and a correction method are provided, and the problem of accurate monitoring of large deformation and discontinuity of a rock-soil body is solved.

Description

technical field [0001] The invention relates to the field of detection of overlying rock deformation during mining, in particular to a method for monitoring the dynamic height of overlying rock damage during underground coal seam mining. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of the primary energy structure. The coal industry is an important basic industry related to the country's economic lifeline and energy security. The vast majority of coal resources in my country are buried deep underground, and various major roof disasters are often induced during the mining process, such as surface subsidence and subsidence, underground water inrush, soil erosion, etc., and these disasters are often driven by the pressure of the mine. The result of rock formation deformation and destruction is closely related to the engineering environment such as rock structure, geological structure, rock mass stress field, groundwater seep...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies mentioned in the above-mentioned background technology, the purpose of the present invention is to provide a monitoring method for the dynamic height of overlying rock damage in underground coal seam mining, based on distributed optical fiber sensing technology, to establish a set of monitoring methods based on distributed optical fiber sensing technology The dynamic monitoring method of overlying rock deformation and failure in coal seam mining provides new methods and new technologies for the prevention and control of geological disasters in coal development. By analyzing the consistency of sensing optical fiber-surrounding rock deformation, a mechanical transfer model of optical fiber-rock-soil interface is constructed, and the monitoring error is proposed. Scope and correction method to overcome the problem of accurate monitoring of large deformation and discontinuity of rock and soil mass

Images