【摘 要】
：
This paper presents the structure models founded in shallow seam, the roof asymmetry arch with three articulations in roof first weighting and the step voussoir beam in roof periodic weighting. These structure models are differ from classic theory, it est
【机 构】
：
Dept. of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054,China
论文部分内容阅读
This paper presents the structure models founded in shallow seam, the roof asymmetry arch with three articulations in roof first weighting and the step voussoir beam in roof periodic weighting. These structure models are differ from classic theory, it establishes the new roof control theory of instability structure roof, especially in shallow seam. Based on the new roof structure theory, the support working state of “given sliding load” is put forward, and the factor of load transmitting is introduced to determine the load on roof structure. Therefore, the proper and accurate calculating methods of support resistance are established. Based on this, the dynamic structure theory in shallow seam could be predicted.
其他文献
The feasibility of the nozzle of self-excited oscillation pulsed jet (SEOPJ) as the breaker and loosing device for the air-lift pump was researched.The dynamic characteristics of the SEOPJ to crush the hard clay and loose the layer of ore deposit were exp
Based on the nowadays\'condition.it is urgent that the gas detection cable communication system must be replaced by the wireless communication systems.The wireless sensors distributed in the environment can achieve the intelligent gas monitoring system.
The new type of risk management is process management.First,the hazard sources are identified before coal mine accidents occur,and then the pre-control measure and information monitoring method based on classifying the hidden hazard sources are given.Last
Coal fires have a very long history in China; the oldest coal fires have being burning for many million years. Up to now more than 56 coal fires spots were distinguished. They mainly locate in West-North of China, North of China and East-North of China. A
The coal resource has an important role in the energy development strategy in China. Because the coal resources are a kind of non-renewable resources, a kind of exhausting resource, which is limited in quantity, and the exploitation of the recourses are n
According to the gas observational data, the gas spatiotemporal distributionswere analyzed in full-mechanized top coal caving in thick, hard and high-gas seams. Thefactors influencing gas effusion were researched and the rules of gas effusion under thespe
The monitoring system for slope deformation which bases on Leica (TCA series)was researched and developed. This system consists of electronic total stations, high precision thermometer, digital barometer, photoelectric frequency adjustor and other related
Based on fuzzy integrated evaluation theory, the safety of coal industry was analyzed, the factors affecting the safety of coal industry was considered, and its fuzzy integrated estimating theory and results were given. Finally this paper proposed a new m
The uniaxial compression tests of cylinder standard specimens and different dimension cube specimens of No.13 coal seam of Jianxin Colliery were carried out using MTS, and the basic mechanics parameters of Jianxin Colliery 13 coal were studied. The dimens
Constitutive relationship of coal under triaxial compression must be determined during solving the theoretical calculation and numerical simulation about coal body failure.This paper carried out conventional triaxial compression test on No.3 coal of Baodi