Study On Stability Analysis And Control Technplogy Of Surrounding Rock In Deep-seated Soft Rock Roadway

Stability analysis and control subject in deep-seated soft rock roadway is always one of the puzzles in underground engineering field at home and abroad. Since the new century, With reducing of shallow mineral resources, exploit depth increasing year by year. Deep-seated exploit faces relatively complicated geological environment. Burst casualty and heavy accidents are more frequent happened by some uncertainty, work environment is more formidable, additionally cost of production is rising rapidly, which challenge the supporting engineering in the deep-seated resoure exploit. Therefore, combining theoretical innovation and engineering practice to form the new deep soft rock supporting system theory is very important. It is very important and meaningful to study proper supporting technique in deep-seated soft rock roadway.This paper mainly studied the existed Problem in chamber, intersection, pump room, and returnaircourse of supporting structure in Zhaolou mine, which is deeper than one thousand meters and through mineral component analysis and physical property test, ground stress test, loose cricle text, numerical simulation analysis and so on to design proper supporting structure and parameters. With grouting-bolting as the kernel, pre-stressed anchor rope and anchor as the auxiliary structure, the three-bolting combined supporting system combining pressure-relief technology of roof control and laneway floor heave control technology solved the supporting stability problem in deep-seated soft rock roadway. After supporting pressure monitoring data proved the stability control technology of success. This paper summarizes the mechanics characteristic of deep-seated soft rock, analysis the failure form and failure mechanism of surrounding rock. Propose the bearing mechanism of grouting-bolting supporting structure, pre-stressed anchor rope and anchor, show laneway floor heave control technology. According to elastic-plastic properties of the complex surrounding rock structure, using large loose circle theory combined bolting system reveals development regularity of surrounding rock plastic zone, propose a new expoit method of soft rock roadway.This paper used th efinite-difference program FLAC3D combining the Finite element program ANSYS to simulates upporting methods in the 4# Intersection, Evaluated the various plans, including the rheologic change after exeavation of 4# Intersection, the stress cases of supporting rock after plans, the changes of elastic-plastic areas and so on, especially selection of the best supporting period of time. Based on four kinds of supporting plan effect, Verify the effects of three-bolting combined supporting system combining pressure-relief technology of roof control and laneway floor heave control technology in stability comprehensive control of deep-seated soft roadway.