Informatics Publishing Limited

Gang Liu ¹, Fukun Xiao ²

Affiliations
1 Heilongjiang Ground Pressure & Gas Control in Deep Mining Key Lab, Heilongjiang University of Science and Technology, Harbin-150022, CN
2 College of Mining Engineering of Hust, Heilongjiang University of Science and Technology, Harbin-150022, CN

Abstract

Experiments on gas drainage drilling and whole of coal sample were carried out by the electrohydraulic servo of rock triaxial test systems and the acoustic emission (AE) system. The test results indicate that coal sample including gas drainage borehole is first the borehole unstability which leads to the whole instability, complete coal sample suddenly destroys multiple blocks. Gas drainage borehole coal sample damage duration shorter, but it appears many times. Complete coal sample happens to some serious damage that duration will reach to maximum. Complete coal sample appear AE count blank area early than gas drainage borehole coal sample. Coal sample including gas drainage borehole releases more energy than complete coal sample. Complete coal sample takes place low frequency when stresses do not change, at other times, whatever stress rising or falling peak frequency hold on around 300 KHz. coal sample including gas drainage borehole first falls existing loading blank area and damage which happens before low frequency gap area.

Keywords

Acustic Emission, Mechanical Properties, Gas Drainage Hole, Damage.

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Shanjun Tian ¹, Chonglong Wu ¹, Gang Liu ¹, Xiang Que ¹, Qiyu Chen ¹

Affiliations
1 School of Computer Science, China University of Geosciences, Wuhan, CN

Abstract

The establishment of spatiotemporal mine information system will help to analyze the changes of mine information, and it plays a helpful role in evaluating mine status and formulating mine production plan. With the development of information technology, there is a growing demand for both space and temporal data processing. Spatiotemporal data model is the mainstream method to deal with temporal geological data. Multiple spatiotemporal data models were studied; and find that the management of 3D geological solid models doesn't earn enough attention. Coal digging is a typical spatiotemporal process. It provides a good research area of the dynamic management of 3D solid model data by simulating the digging process. Then the simulation of coal digging process was selected as the research content, and present the spatiotemporal data model for coal digging simulation through digging out the management methods of 3D geological solid models in spatiotemporal mine information system. By referring the existing spatiotemporal data model theories, and put forward three main technologies including the management of 3D geological solid models by geological spatiotemporal objects and versions, the observation data accesses with OPC technology, and the response of geological spatiotemporal objects to geological spatiotemporal events. In the experiment, 3D geological solid models were developed using actual coal mine survey data, the collection, standardization, access of observation data, the establishment and configuration of OPC Client and OPC Server, the programming of response methods. The results are quite good and verify the feasibility of theory and technology in this paper. On expectation the frame can be used for other solid mine or unexpected areas. Hope that the research work can promote the study of spatiotemporal data solid model and geological information system.

Keywords

Spatiotemporal Data Model, Digging Simulation, Geological Spatiotemporal Object, 3D Geological Solid Model, Spatiotemporal Process.

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