Advanced Materials Research Vols. 1010-1012

Abstract: By core observation and logging in Block8, Jinglou oilfield, we distinguished the sedimentary structure characteristics and the logs’ features of subaqueous distributary channel, mouth bar, sheet sand and interdistributary. Then we promoted it in the whole region, and characterised the sedimentary faices of every layers. So we provide a reliable geological basis for progressive development in research area.

Abstract: Rock of Xujiahe formation in Sichuan basin is characterized by very low porosity and permeability, forecast the spatial distribution of fractured reservoir is the key of success in exploration. Combine logging and seismic data, analysis multi-attributes, optimizing post-stack seismic data processing method, we selected amplitude, average energy, chaotic reflection and amplitude weighted instantaneous frequency (AWIF) to study seismic response. The fractured reservoir have weak amplitude, low average energy, low AWIF and high chaotic reflection. Then with the aid of 3D visual technology, research data set, and recognize that some data, like amplitude and impedance etc, should emphases low value, others like chaotic reflection and auto-fault extraction(AFE) etc, should stand out high value. Base on these, form a suit of technology predicting fractured reservoir by using 3D visualization method. Take amplitude, chaotic reflection and AFE data as case, depict the spatial distribution of fractured reservoir. The results can clearly exhibit the spatial distribution of reservoir

Abstract: With the rapid development of coal mine resources, heat harm in deep mine is one of the key problems to be solved in our country. In this article, through analyzing the different heat sources of the mine,we get the calculation model of airflow temperature which is related to the different feature points of shaft , horizontal and slant roadways and extraction working areas.We also take the actual geological conditions into consideration and build simulation system in coal mine to imitate and budget the airflow temperature and air amount in roadway which is at different ventilation system conditions. And it can provide theoretical and technical basis for the optimization scheme research of mine ventilation system , the ways to choose the mine refrigeration system and installation position of air cooler.

Abstract: Focus on a-400m level stoping in a gold mine, the ANSYS numerical software was used to study the stope structural parameters in upward drift cut-and backfilling mining methods. First, according to engineering experience, the design of stope structural parameters was obtained. Then the stoping process of both the first drift and the second drift was simulated by the numerical software. The vertical maximum displacement and the vertical maximum stress were selected as evaluation indexes for analysis. The result shows that the third project, whose drift width is 4 m and layer height is 3 m, have the best effect with the less displacement and stress compared with other projects.

Abstract: For the study on the problem of rational width of entry protection coal-pillar, according to the gateway of 5103 mining face in Heshan Mine, through theoretical calculation and numerical simulation, rational width of entry protection coal-pillar was educed, which was 25 m. The roof and floor and 2-sides deformation were both 35 mm through engineering practice, and its feasibility was demonstrated, which provided some theoretical references for preserving reasonable coal-pillar for the similar coalface with large mining height.

Abstract: Based on the fluid-solid coupling theory, The fractured rock mass was described as a continuous porous medium, and consider the rock mass permeability coefficient has a relationship with the stress and strain. The dynamic change of permeability coefficient was achieved using the multi-physics coupling analysis software COMSOL, and found that the stress and strain of surrounding rocks changes a lot due to mining. The maximum stress and strain in the mudstone area reaches 2-3 times of the original one, which happened at the immediate roof of mined-out area. According to the analysis of seepage field, mining does not destroy water resistance of floor aquifer. Mining fissures do not connect limestone aquifers, and water in the limestone is less likely to flow into stop to cause damage.

Abstract: By analyzing the ventilation system’s sensitivity and studying the ventilation pipeline model, it puts forward the concept of sensitivity branch and the selection method, i.e. selecting the top 20% branches which have the biggest α value. Sensitivity branch plays an important role in managing the ventilation system efficiently, judging the abnormal wind amount and guiding the construction of new mine alleys.

Abstract: As this mining area has a shallow coal seam and a dump, therefore, the mining for the deep resources uses the method of transition from open-pit to underground without protective coal column. In this paper, the numerical simulation method is used to analysis the surface subsidence and slope stability from the two different mining schemes which are from inside to outside, and from outside to inside, in order to obtain the optimization of mining scheme. And settlement and slope stability of rock body are further analyzed from two aspects of fully exploit from the tendency and from toward, the result of an overall slip slope failure caused by underground mining is found. So that in the process of exploitation, corresponding prevention and control measures to the slope safety has been put forward, ensuring smooth production.

Abstract: Deformation of roadway driving along goaf was very serious during mining in Qidong coal Mine.This paper took the roadway as the engineering background, firstly, numerical simulation of the roadway has been made by FLAC^3D,then its surrounding rock deformation properties and stress distribution were analyzed,the reinforcement technology was proposed during mining, lastly, the deformation around roadway during mining was observed and analyzed. The practical engineering shows that : the combined supporting of bolting-shotcreting-grouting can effectively control the deformation around roadway, the supporting effect is good , and better social and economical benefit have been gotten.

Abstract: In order to monitor and forecast rockburst, and analyze the source and magnitude,a set of microseismic monitoring rockburst technology was developed,combining with the actual situation in Dongtan coal mine.The technique used SOS microseismic monitoring system to determine failure points,record rockburst moments,the size of epicenter,the epicenter pressure drop and vibration mechanism,infer coal and rock stress state and destruction,and evaluate and monitor rockburst danger degree in accordance with changes of microseismic activities,focal position and activities tendency. The optimization microseismic monitoring network was layoutted in monitoring areas.The seismic geophone picked up microseismic signals and recorded in the rockburst figure,and the rockburst occurrence regularity and development trend were studied based on statistical analysis results of microseismic datas.Then by using VB6.0,the rockburst monitoring results were compounded in the mining drawing with concentration analysis.The rockburst events were statistical processed partitionedly to obtained vibration frequency,maximum vibration energy and total shock energy.The rockburst can be monitored and predicted through the rockburst events reflected by the datas.