摘要
When gob-side entry retaining is implemented in deep coal seams threatened by rockburst, the cementbased supporting body beside roadway will bear greater roof pressure and strong impact load. Then the supporting body may easily deform and fail because of its low strength in the early stage. This paper established the roadside support mechanical model of gob-side entry retaining. Based on this model,we proposed and used the soft–strong supporting body as roadside support in the gob-side entry retaining. In the early stage of roof movement, the soft–strong supporting body has a better compressibility, which can not only relieve roof pressure and strong impact load, but also reduce the supporting resistance and prevent the supporting body from being crushed. In the later stage, with the increase of the strength of the supporting body, it can better support the overlying roof. The numerical simulation results and industrial test show that the soft–strong supporting body as roadside support can be better applied into the gob-side entry retaining in deep coal seams threatened by rockburst.
When gob-side entry retaining is implemented in deep coal seams threatened by rockburst, the cement- based supporting body beside roadway will bear greater roof pressure and strong impact load. Then the supporting body may easily deform and fail because of its low strength in the early stage. This paper established the roadside support mechanical model of gob-side entry retaining. Based on this model, we proposed and used the soft-strong supporting body as roadside support in the gob-side entry retaining. In the early stage of roof movement, the soft-strong supporting body has a better compress- ibility, which can not only relieve roof pressure and strong impact load, but also reduce the supporting resistance and prevent the supporting body from being crushed. In the later stage, with the increase of the strength of the supporting body, it can better support the overlying roof. The numerical simulation results and industrial test show that the soft-strong supporting body as roadside support can be better applied into the gob-side entry retaining in deep coal seams threatened by rockburst.
基金
supported by the National Basic Research Program of China (No. 2010CB226805)
the Taishan Scholar Construction Project of Shandong Province, China
the National Natural Science Foundation of China (No. 51344009)
the Research Award Fund for Outstanding Young Scientists of Shandong Province (No. BS2012NJ007)
the Ground Pressure and Strata Control Innovative Team Fund of SDUST (No. 2010KYTD105)
the Natural Science Foundation of Shandong Province (No. ZR2012EEZ002)
