Zhang M.,Xinwen Mining Group Co. |
Ning J.,Shandong University of Science and Technology
Advanced Materials Research | Year: 2012
Under the background of the hydrogeology conditions of the first working face of 11 coal seam in LuXin coal mine, theoretical formula prediction and numerical simulation were used to research the influence of mining height on the growth altitude of water flowing fractured zone. According to the requirement of the minimum thickness of waterproof coal pillars, the reasonable mining height was confirmed to be 3m. It was proved by similar material simulation that the maximum height of water flowing fractured zone was about 39.5m when the mining height is 3m, which was consistent with results of numerical simulation, and the thickness of protective layer was 23.5m, which ensured the safety of mining. © (2012) Trans Tech Publications.
Tian Q.T.,Xinwen Mining Group Co.
Advanced Materials Research | Year: 2014
This paper compares and analyzes the common recognition method and technology of irregular graphics and image, and its application to specific graphics recognition. In this paper, the application system realizes the image histogram processing, threshold value processing and edge processing, realizes the binary image, and then compared with database information, recognizing the need of graphic information, but also the graphic information such as encryption and decryption. The system is practical, the application scope is very broad, and has good popularization value. © (2014) Trans Tech Publications, Switzerland.
Cheng Y.-H.,Anhui University of Science and Technology |
Jiang F.-X.,University of Science and Technology Beijing |
Pang J.-L.,Xinwen Mining Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012
By using the online intrinsic-safe mining pressure monitoring system, two observations regarding the lateral pressure were made to one solid coal side of goaf at the working face 3801 (where the fully-mechanized top-caving method FMTC was used) at Shuiliandong Mine, with the results are as follows: (1) The characteristics of movement of the overlying rock, force borne by the supports, and the lateral supporting pressure in the tunnel were obtained, the fact that pace of the periodical lateral pressure equals to that of the periodical strike pressure was revealed, and a model for the lateral overlying rock structure was established based on the stabilized roofing, the upper roof's structure (16-24 m above the coal seams) and the rock-beam structure for the main roof in the tunnel of goaf. (2) The conclusion was drawn that the property of the separating wall of the tunnel can suit the movement of the overlying rock resulted from the calculation by establishing the model of force-bearing of the separating wall of the tunnels in goaf in combination with the stress-strain relation. (3) The dominance of the overlying rock movement on pressure was determined on the basis of the features of the force bearing of the advanced support due to the lateral periodical pressure and the lateral supporting pressure, which will be used to study the theory by which the rock formation's movement controls the mine's pressure. The result was applied to optimize the width of the coal pillar between 3802 transport level and 3801 working face to 8 m, reduced by 22 m compared with the previous one so that the former meets the expectation after construction.
Yang X.-P.,China University of Petroleum - East China |
Lu S.-J.,China University of Petroleum - East China |
Lu S.-J.,Shengli Engineering and Consulting Company Ltd |
Gao Z.-F.,Xinwen Mining Group Co. |
And 2 more authors.
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2010
The amine solution is characterized by quick absorption, large absorption capacity and simple regeneration. The potentiometry method and pH method were used to study carbon dioxide absorption characteristics in MEA, DEA and TEA solution. The relations among electric potential, pH, absorption rate, absorption capacity were studied. The new measurement methods about amine solution concentration and carbon dioxide concentration were presented. The results show that MEA and DEA are good amine solutions.Also after drawing the relation curve between absorption rate and potentiometry or absorption rate and pH, the potentiometry method (or pH method) can be used to analyze the absorption extent of CO2 in amine solutions.
Yue Z.-W.,China University of Mining and Technology |
Yang R.-S.,China University of Mining and Technology |
Sun Z.-H.,China University of Mining and Technology |
Sun Z.-H.,Xinwen Mining Group Co. |
And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010
In order to simulate fracture behavior of rock under different angles between pre-crack and loading direction, the fracture experiments of the three-point bend beam containing unilateral incision subjected to impact load were carried out by transmission-type caustics test system. Experimental results show that inclined edge crack specimen is subjected to normal stress and shear stress. The growth cracks are mixed code cracks and the focal speckles at the tips of crack are also mixed. The dynamic stress intensity factor, crack propagation time and the crack propagation velocity are associated with the angle changes between pre-crack and the loading direction. As the angles between pre-crack and the loading direction increase, the maximum of crack propagation speed increases, and the oscillation of the crack propagation velocity also increases. When the loading direction is the same as the pre-crack direction, the crack initiates the fastest, and the crack is the I-type crack. As the angles between loading direction and pre-crack direction increase, the crack takes on mixed characteristic, the dynamic stress intensity factor K II d represents more obviously and its value increases.