Support technology of large section and compound roof open-off cut in soft roof and soft floor and soft coal and deep buried seam
SUN Hailiang
Abstract：In order to meet the needs of transportation and installation of high-power equipment in fully-mechanized mining face,the traditional support methods can not meet the support problems of large section and large span open-off cut.The theoretical analysis and onsite monitoring methods are used to study the large section and large span open-off cut support technology under the conditions of deep soft roof in soft roof and soft floor and soft coal and deep buried seam.The width of open-off cut is 10 m,the height is 4.3 m,the cross-sectional area is 43 m2,and test the support effect.The results show that the use of high-strength anchor bolt and anchor + long-short cable anchor trusses supporting technology to reinforce the surrounding rock to form a super-strong,super-thick,stable,superimposed on the reinforcement arch,composite beams,the maximum roof sinking amount of 188 mm,the maximum displacement of two wall 376 mm,the technology can effectively control the open-off cut rock failure and deformation,to meet the requirements of the face of the transport installation.
Keywords：large section and large span open-off cutsoft roof and soft floor and soft coal seamcompaound roofcombined support with bolt-mesh-cable and joist
Publication Date：2017-01-01