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Wang D.,Shandong University | Wang D.,State Key Laboratory of Mining Disaster Prevention and Control | Wang Q.,Shandong University | Wang Q.,State Key Laboratory of Mining Disaster Prevention and Control | And 7 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

According to field investigation and deformation monitoring of roadway driving along goaf in fully mechanized top coal caving face in Zhaolou mine, failure characteristics of roadway surrounding rock have been analyzed and its deformation failure mechanism has been deeply revealed. Results indicates that low surrounding rock density, high in-situ stress, large destruction scope, unreasonable supporting structure and parameters, complex stress environment and large section size are the main reasons of surrounding rock failure and deformation. Based on control principle of intensive-yielding-coupling support and key parts reinforced support, supporting measures of roof bolt net strip cable, longitudinal strip+two sides anchor net ladder cable, longitudinal steel ladder+narrow coal pillar cable reinforcement and gunite+entity coal side drilling to relief stress are proposed. In addition, field test has been implemented. After roadway driving along next goaf stability, the effect of roadway surrounding rock is good. The maximum force of bolts and anchors are within their yield range, and set aside a sufficient margin for the recovery period. The results can provide a reference for similar complex and difficult supporting roadway. Source


Wang Q.,Shandong University | Wang Q.,State Key Laboratory of Mining Disaster Prevention and Control | Wang Q.,Yankuang Group Company Ltd | Wang D.-C.,Shandong University | And 8 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

To overcome the problem of high stress roadway support in deep mine, a new support form-U-type confined concrete (UCC) arch centering was developed. In order to definite the mechanical properties and deformation failure mechanism of UCC arch centering, various experiments were carried out by using underground engineering confined concrete arch 1:1 mechanism test system and numerical computing method. The results show that under the pressure loading conditions, the yield load of UCC29 arch is 1 230 kN and the limit load of UCC29 arch is 1 310 kN, the differences between laboratory test and numerical simulation results are only 8.86% and 12.5% respectively. The arch deformation form is “vault rises, legs restrained and global variable thin”, the maximum deformation region is the central legs to sprung arch position. The deformation failure mechanism of arch is global variable instability caused by local strength yield. The application shows the surrounding rock control effect of UCC arch centering is good, and the UCC arch centering is a new effective support for deep mine high stress roadway. ©, 2015, China Coal Society. All right reserved. Source


Wang Q.,Shandong University | Wang Q.,State Key Laboratory of Mining Disaster Prevention and Control | Wang Q.,Yankuang Group Company Ltd | Shao X.,Shandong University | And 8 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

In order to solve the problem in deep high-stress rock roadway and roadway with structural fracture zone, a new support system-square-type steel confined concrete (SQCC) was developed. And the important component of it, square-type steel confined concrete arch centering was further studied. The inner force expressions of straight wall semicircle arch was deduced with the force method, and combined with the engineering practice to calculate the inner force distribution of four section arch, which is the field application, under uniformly loads. From the inner force distribution of arch centering, that arch legs and vault is the key position of the arch centering failure is confirmed. Through the strength analysis of the SQCC component to check the key parts of the possible, get that first failure part is arch leg and the ultimate bearing capacity of SQCC arch centering is 1315 kN. The mechanics experiment of SQCC arch centering are carried out by using designed 1:1 mechanics test system of confined concrete arch centering. Meanwhile combined with the results of numerical experiments on SQCC arch centering by using ABAQUS software. Through the analysis on the error rate of ultimate bearing capacity, δFe-Ft=-7.1%, δFe-Fn=-1.1%, the key position, the inner force, deformation and stress, research the mechanical properties and faileure mechanism of SQCC arch centering, and verify the conclusion based on the theoretical arithmetic and laboratory experiment is right. ©, 2015, China Coal Society. All right reserved. Source

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