Li W.-T.,Shandong University |
Wang Q.,Shandong University |
Wang Q.,Yankuang Group Company Ltd |
Li S.-C.,Shandong University |
And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014
Surrounding rock of deep roadway with intercalated coal seam in roof always generates serious roof deformation and failure, and is difficult to control. Unique 2-partition fracture mode of surrounding rock is found by site detection, that there are two relatively independent serve fractured zones in surrounding rock, which are "roadway peripheral loose fracture zone" and "roof separation fracture zone beside intercalated coal seam interface" respectively. The calculation model was proposed, based on which the laws of roadway key points displacement, plastic zone, and asymmetric deformation influenced by the thickness and location of intercalated coal seam and middle wall width of bifurcation roadway was researched, and the deformation and failure mechanism was analyzed. The results show that the existence and development of "roof separation fracture zone beside intercalated coal seam interface" in the deep roof, leads to the failure of the self-bearing structure and the loss of self-bearing capacity of surrounding rock, fracture zone exceed the range of support system, and finally the overall failure of surrounding rock and support. The "inner repair + outer control" asymmetric controlling measure with mainly grout was proposed based on research results, which was carried out in field test, and achieved good results. Source
Wang Q.,Shandong University |
Wang Q.,Anhui University of Science and Technology |
Li W.,Shandong University |
Li W.,Shandong University of Science and Technology |
And 8 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015
In order to solve the problem in deep rock roadway and roadway with structural fracture zone, a new support form, i.e. U-type confined concrete (UCC) arch centering, was developed.The bearing and deformation characteristics of the arch centering were researched experimentally, and the key position of the arch centering failure was confirmed. Finally, the action principle of the support system was analyzed. The results show that UCC short columns have better ductility and post-bearing capacity, and the ultimate beating capacity is increased by 127%-196% compared with that of U-steel short columns, which shows that the ultimate beating capacity of UCC short columns is 2.16 times that of U-steel arch. UCC arch centering is a three-dimensional support system, the surrounding rock control effect is significant, and the maximum deformation of roadway surrounding rock is 53 mm under UCC arch centering, only 20.6% of that of U type steel arch frame. UCC arch centering can provide high support, guaranteeing the safety of supporting system effectively. ©, 2015, Central South University of Technology. All right reserved. Source