检索结果-内蒙古大学图书馆

Temperature-dependent diffusion process of methane through dry crushed coal

Journal of Natural Gas Science and engineering 2015年 22卷 609-617页

作者： Xu Tang Zhiqiang Li Nino Ripepi A. Kyle Louk Zhaofeng Wang Dangyu Song Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University Jiao Zuo 454000 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China Collaborative Innovation Center of Central Plains Economic Region for Coalbed/Shale Gas Henan Province China

Temperature influence or geothermal effect is pervasive in the carbon dioxide geological sequestration , GIP (gas in place) estimation, and the Coal Mine Methane (CMM) degasification process. The temperature effects on the adsorption process are not explicitly considered in previous gas diffusion tests. This study seeks to treat the adsorption–diffusion process as a unified process and then investigate the temperature influence effect on this process. Isothermal tests under different constant temperatures show that 1) Langmuir constant-a is independent of temperature, and Langmuir constant-b can be treated as a negative linear function of temperature in engineering applications. Two groups of diffusion tests were conducted: diffusion under constant temperature and diffusion with increasing temperature. The diffusion tests show that 2) for the diffusion process with increasing temperature, the equivalent diffusion coefficient (D eq ) increases with increasing temperature, and this relationship can be described by the revised Arrhenius-style equation. 3) For the diffusion process under constant temperature, the diffusion coefficient (D) is dependent on temperature and independent of adsorption equilibrium pressure . The relationship between diffusion coefficient and temperature can also be described using the revised Arrhenius-style equation. 4) Diffusion coefficients range from 8.53 × 10 −8 cm 2 /s to 1.97 × 10 −7 cm 2 /s when temperature rises from 30 °C to 90 °C.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of shear modulus's influence on coal pillar's anti-disturbance capacity

引用

Electronic Journal of Geotechnical engineering 2014年第J期19卷 2289-2302页

作者： Jian, Hao Yongkui, Shi Yuting, Hou Xiaoyuan, Zhan State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao China College of Resources and Environmental Engineering Shandong University of Science and Technology Qingdao China

In order to study pillar's dynamic disturbance rule and shear modulus's influence on mechanical response, using an explicit finite difference program FLAC3D, plastic zone's developing rule and of shear stain rate, velocity field, strain energy's distribution rule of a cylinder pillar with a ratio of 2 between height and diameter which was disturbed by dynamic wave were analyzed. Results showed that, disturbed by dynamic wave, shear failure was caused in pillar, particles 's stress variable quantity and stored energy, where was on constraint surface edge, was greatest, and they would develop to plastic zones earliest. Plastic zones would increase with shear modulus becoming greater catastrophically, that is while shear modulus becoming greater than threshold, plastic zones would increase sharply, which indicates there exists a anti-disturbance capacity to given rock mechanics parameters. Dynamic disturbance's mechanical work to pillar would transform into elastic strain energy partly, and others would transform into plastic strain energy. While shear modulus is smaller than threshold, dynamic disturbance's mechanical work to pillar would transform into elastic strain energy mainly, pillar's strain and strain energy would return back to original state after dynamic load disappeared. While shear modulus is greater than threshold, dynamic disturbance's mechanical work to pillar would partly transform into elastic strain energy, and others would transform into plastic strain energy, even if dynamic wave disappeared, pillar's strain could not return back to original state after dynamic load disappeared, and the strain energy would become greater. © 2014 ejge.

关键词： Elastic moduli

来源：评论

学校读者我要写书评

暂无评论

The prediction of damage degree of coal floor based on the Naive Bayes Classifier

引用

Electronic Journal of Geotechnical engineering 2014年第Z5期19卷 17405-17412页

作者： Yongkui, Shi Pengrui, Li Jian, Hao Jisheng, Wu Hao, Wu State Key Laboratory Brding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao China

Considering the complexity of floor damage in coal mining, based on the summary of measured data of typical damage degree of coal floor nation-wide in China, this paper figures out that damage degree of coal floor is closely linked to six major factors, including depth of coal seam, dip angle of coal seam, thickness of coal seam, dip length of coal face, anti-damage ability of the floor and fractured zone. The author applies rough set theory, Bayesian theory, and theory of Nonlinear Subjects, through Excel, Weka and UltraEdit software, to constructing prediction model based on Naive Bayes Classifier, making the prediction of damage degree of floor accurate. By training and predicting samples, the conclusion was found that prediction with high accuracy based on Naive Bayes Classifier is not only supported by reliable theory, but of relatively practical application value on the spot.

关键词： Floors

来源：评论

学校读者我要写书评

暂无评论

Semi-analytical and numerical investigation of hydraulic fracturing and geological barrier integrity based on a case study

引用

Environmental Earth Sciences 2015年第10期73卷 5825-5842页

作者： Feng, Wentao Hou, Zhengmeng Zhou, Lei Li, Mengting Were, Patrick Sino-German Energy Research Center Sichuan University Chengdu China Energy Research Center of lower Saxony Clausthal University of Technology Goslar Germany Institute of Petroleum Engineering Clausthal University of Technology Clausthal-Zellerfeld Germany State key laboratory of coal mine disaster dynamics and control Chongqing University Chongqing China

In this paper, numerical and semi-analytical investigations were conducted to understand the hydraulic fracturing operation in the tight gas reservoir only identified by the code A7 in the North German Basin. Two simulators, FLAC3Dplus (numerical, full 3D model) and MFrac (semi-analytical, modified model based on the conventional pseudo-3D model), were used to model the fracturing operations including fracture propagation, proppant transport and settling. A comparison of the two simulators was carried out through simulations. Meanwhile, the function of the geological barrier integrity in A7 was also studied and confirmed. The simulations were based on the history matching of the in situ measured well head pressure. At the end of the simulation, a long fracture (length ≫ height) was modeled by both simulators. Although the results express some differences in the modeled fracture length and width (average), their results for fracture pressure, fluid leak off and proppant distribution are comparable. That means they would provide similar productivity in the later production. Investigation of the geological barrier integrity confirms that the cap rock, formed from rock salt and anhydrite, normally has higher minimum horizontal stress and lower permeability providing enough resistance to prevent the fracture from propagating in the vertical direction of the cap rocks. The case study reveals that, even when the injection volume was increased 10 times the initial volume, the integrity of the cap rocks could not be broken. Despite the presence of interbedded shale formations, in the reservoir as those of the cap rock an impediment function, if their thicknesses are too small to prevent their breakage and the injection volume too large for them to resist fracturing.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analysis of anchoring mechanism of fully grouted prestressed anchor

引用

Journal of engineering Science and Technology Review 2014年第1期7卷 15-20页

作者： Wen, Zhi-Jie Zhu, Zhu-Wu Lian-jun, Chen Jin-hao, Wen State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao Shandong 266590 China Shandong Provincal Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao Shandong 266590 China Research Center of Geotechnical and Structural Engineering Shandong University Jinan Shandong China Department of Civil and Environmental Engineering Aalto University ESPOO 00076 Finland

Some researchers have been carried out on analysis of the influence of the full grouted prestressed anchor shape of borehole wall on its carrying capacity. Based on the self-affine fractal feature of anchor borehole wall structural plane, the relation equation among structural plane shear strength, liquid injection pressure, tensile load and structural plane fractal dimension D was built, the instability judgment criterion of anchoring bearing strata and rock structural plane was determined, the solving equations of disintegrated rock support density were derived. Based on the experimental results, the theoretical basis of support design under the disintegrated rock condition was offered. © 2014 Kavala Institute of Technology.

关键词： Fractal dimension

来源：评论

学校读者我要写书评

暂无评论

Numerical study on hydraulic fracturing in different types of georeservoirs with consideration of H 2 M-coupled leak-off effects

引用

Environmental Earth Sciences 2015年第10期73卷 6019-6034页

作者： Yang Gou Lei Zhou Xing Zhao Zhengmeng Hou Patrick Were Sino-German Energy Research Center Sichuan University Chengdu China Energy Research Center of Lower Saxony Goslar Germany State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing China College of Petroleum and Gas Engineering Southwest Petroleum University Chengdu China Institute of Petroleum Engineering Clausthal University of Technology Clausthal-Zellerfeld Germany

With the increase in the world’s energy consumption and the change in climate, unconventional energy resources become more and more popular. Since geological formations of low or ultra-low permeability are usually involved, hydraulic fracturing is one of the most important tools for their exploitation. The objective of this paper is to investigate hydraulic fracturing and its hydro-mechanical influences on different types of georeservoirs, including tight gas, oil, and geothermal reservoirs. Based on the previous work of hydraulic fracturing simulation with FLAC3Dplus, the multi-phase multi-component flow simulator TOUGH2MP is coupled for the numerical study. A new coupling approach is designed with special consideration of the H2M-coupled process in different types of georeservoirs. For the simulation, a generic 3D ¼ model (200 × 300 × 200 m, consisting of 50 m caprock, 100 m reservoir formation, and 50 m base rock) is adopted. The simulations are run under comparable reservoir and operative conditions. The results show that fracture propagation and proppant concentration are comparable with a short period of slurry injection (80 min × 6 m3/min). The fracturing fluid does not penetrate deep into the formation. Due to the high compressibility of gas, the induced pore pressure is much lower than that in oil and geothermal reservoirs, although the final leak-off ratio is comparable. The hydraulic fracturing causes stress reorientation in georeservoirs. According to the criterion of 5° stress reorientation, the minimum fracture spacing for a multiple fracture system in the assumed geothermal reservoir is 73 m, while that in an oil and gas reservoir is 66 and 60 m, respectively. This work expands on the numerical simulator as well as the understanding of hydraulic fracturing in unconventional georeservoirs. The results of this study can be used further to optimize the fracture spacing in a multiple hydraulic fracture system in different reservoir types.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The algorithm on displacement differences calculation and the error of surface displacement measuring device

引用

Sensors and Transducers 2014年第1期162卷 167-172页

作者： Gan, Ping Hu, Guowen Li, Zhenzhen Chen, Zhuo Cheng, Xiao Huang, He Zhang, Xiaosong State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing China College of Communication Engineering Chongqing University Chongqing China Chongqing Communications Research and Design Institute Chongqing China

Angle sensor is the core component in the surface displacement measuring device, whose manufacturing process, fixing position and internal device performance can affect the testing accuracy in many aspects. This paper would present a new displacement calculation based on coordinating transformation and employ particle swarm method to calibrate the data. Experimental results show that the amended data through this method is quite close to standard test bench data, indicating that the proposed displacement differences calculation and error correction algorithm can effectively eliminate the fixed bias of surface displacement measuring. © 2014 IFSA Publishing, S. L.

关键词： Error correction

来源：评论

学校读者我要写书评

暂无评论

Classification of the stability of surrounding rock in mining roadway based on support vector machine

引用

Electronic Journal of Geotechnical engineering 2014年第Z5期19卷 17341-17351页

作者： Yongkui, Shi Jingyu, Zhang Jian, Hao Wenying, Li State Key Laboratory Breeding Base Mine Disaster Prevention and Control in Shandong Province Shandong University of Science and Technology Qingdao China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao China

This article presents the theory of classification and prediction for the stability of surrounding rock in mining roadway based on SVM (Support Vector Machine) which by support vector classification and uses WEKA, MATLAB softwares and the rough set theory to analyze and verify the influences of the intensity index of surrounding rock, the integrity of surrounding rock, mining depth and other nonlinear factors on the stability of mining roadway. The training and prediction of the stability of surrounding rock in mining roadway based on LIBSVM is triumphantly realized;the SVM multi-classification model of the stability of surrounding rock in mining roadway also is established and the accuracy of prediction is greatly improved. The results have shown that it is feasible to classify the stability of surrounding rock in mining roadway by SVM. © 2015 ejge.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Fault analysis and solution on bucket dropping accident in hoisting system

引用

Sensors and Transducers 2014年第1期163卷 204-209页

作者： Liu, Chunhui Xue, Lin State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology China College of Information and Electrical Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China

Overwinding was the main accident in lifting systems of coal mine and bucket dropping accident was the most serious overwinding accident. According to the cause and mechanism of the bucket dropping accident in main shaft hoisting systems, the conclusion that overloading promotion was the main cause of bucket crash accident was obtained with the fault tree analysis method. One theoretical analysis model was established in order to prevent the occurrence of overloaded bucket dropping accident. The model provided scientific basis and steps in theory for qualitative and quantitative analysis on the cause of falling bucket accident and for the study on accident prediction and prevention. This article proposed several feasible technical measures to prevent the bucket crash accident, which had important guiding significance in practical application. © 2014 IFSA Publishing, S. L.

关键词： Fault tree analysis

来源：评论

学校读者我要写书评

暂无评论

Filling mining's assessment method based on ground pressure monitoring: A case study

引用

Electronic Journal of Geotechnical engineering 2014年 19 O卷 3669-3680页

作者： Yongkui, Shi Jian, Hao Yuting, Hou Jingyu, Zhang State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266590 China College of Resources and Environmental Engineering Shandong University of Science and Technology Qingdao 266590 China

Filling mining, which can control strata movement, has been developing increasingly. Filling mining's strata movement and stress transferring rule are different with traditional long wall mining, and the assessment method of filling mining is few. In this paper, difference of overlying stratum's movement rule and supporting pressure distribution's characteristics between traditional long wall mining and filling mining was illustrated, based on which, filling effect's assessment method based on ground pressure monitoring was put forward. Surrounding rock strata dynamic monitoring system, whose key are GYY15Z drilling stress sensor, GUD650 displacement sensor and GYD60 stress sensor, was developed. A case study was described, using assessment method, in Caozhuang Coal Mine 81006 working face, whose surrounding rock strata dynamic monitoring was done and filling effect was evaluated based on monitoring results. Results show that assessment method proposed in this paper is effective, and monitoring index was scientific and rational. © 2014 ejge.

关键词： Filling

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：