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High precision slope deformation monitoring model based on the GPS/Pseudolites technology in open-pit mine

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mining Science and technology 2010年第1期20卷 126-131,137页

作者： WANG Jianpeng, GAO Jingxiang, LIU Chao, WANG Jian school of environment and {2. informatics, china university of mining & technology, xuzhou 2.1008, china school of environment and {2. informatics China University of Mining & Technology Xuzhou 221008 China

As the number and geometric intensity of visual satellites are susceptible to large slopes in open-pit mines, we propose integration of GPS/Pseudolites (PLs) positioning technology which can increase the number of visible satellites, strengthen the geometric intensity of satellites and provide a precision solution for slope deformation monitoring. However, the un-modeled systematic errors are still the main limiting factors for high precision baseline solution. In order to eliminate the un-modeled systematic error, the Empirical Mode Decomposition (EMD) theory is employed. The multi-scale decomposition and reconstruction architecture are defined here on the basis of the EMD theory and the systematic error mitigation model is demonstrated as well. A standard of the scale selection for the systematic error elimination is given in terms of the mean of the accumulated standardized modes. Thereafter, the scheme of the GPS/PLs baseline solution based on the EMD is suggested. The simulation and experiment results show that the precision factors (DOP) are reduced greatly when PLs is located suitably. The proposed scheme dramatically improves the reliability of ambiguity resolution and the precision of baseline vector after systematic error being eliminated, and provides an effective model for high precision slope deformation monitoring in open-pit mine.

关键词： open-pit mine slope deformation PLs EMD

Precise point positioning and its application in mining deformation monitoring

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中国有色金属学会会刊：英文版 2011年第S3期21卷 499-505页

作者： XU Chang-hui1, 2. WANG Jin-ling2. GAO Jing-xiang1, WANG Jian1, HU Hong1 1. school of environment and {2. Information, china university of mining and technology, xuzhou 2.116, china 2. school of Surveying and {2. Information Systems, university of New South Wales, Sydney 2.52. Australia school of environment and {2. Information China University of Mining and Technology Xuzhou 22116 China school of Surveying and spatial Information Systems University of New South Wales Sydney 2052 Australia

Precise point positioning (PPP)-based deformation monitoring scheme is presented for the use in mining deformation monitoring. Within the solutions of daily observation, outliers are detected and removed to avoid any potential misinterpretation of the results and then the deformation can be extracted by the coordinate differences between the two consecutive solutions. Meanwhile, because of the special location of a rover station in mining areas, the satellite geometry may be insufficient for a reasonable PPP solution, and the multipath impact an also be significant. Therefore, it is necessary to predict the satellite geometry before any daily observation. To evaluate the ability of extracting the deformation using the PPP-based method, various quality measures were introduced. The results of three datasets of the same station show that the precision of deformation monitored by PPP can reach up to cm level and even mm level.

关键词： precise point positioning deformation monitoring outlier identification geometry multipath

Chromium leaching mechanism of coal mine water—a modeling study based on xuzhou-Datun coal mine district

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mining Science and technology 2010年第1期20卷 97-102页

作者： SHAN Yao QIN Yong, WANG Wenfeng school of Resource and Earth Science, china {2. of mining & technology, xuzhou 221116, china school of Resource and Earth Science China University of Mining & Technology Xuzhou 221116 China

In order to investigate chromium contamination of coal mine water, to analyze chromium leaching mechanism and to evaluate environment pollution potential of coal mine water, we perform site investigations, physical and computer modeling in the xuzhou-Datun coal mine district. The result of our test samples shows that chromium concentration was 9 μg/L in roof leachate and 3 μg/L in coal leachate. The host rock has a higher pollution potential than that of coal seams. Leaching experiments and XRD test results indicate that chromium is released from the process of transforming illite to kaolinite. The pH, pe and temperature of coal mine water affect the chromium leaching behavior. Modeling results suggest that the adsorption of adsorbents controls chromium concentration in coal mine water. The chromium adsorption ratio is quite low in both an acid and in an alkaline environment. Therefore, coal mine water has a high pollution potential. Under other conditions, chromium adsorption is stronger in a neutral water environment, so that chromium concentrations may be very low.

关键词： chromium coal mine water leaching

Cycle-slip Detection in PPP based on Empirical Mode Decomposition

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Cycle-slip Detection in PPP based on Empirical Mode Decompos...

Microcosmic analysis of ductile shearing zones of coal seams of brittle deformation domain in superficial lithosphere

2.11 3rd IEEE International Conference on Information Management and Engineering(ICIME 2.11)

作者： HU Hong school of environment Science and {2. informatics china university of mining and technology xuzhou, china, 221116 KANG Rui-hong and GAO Jing-xiang school of environment Science and {2. informatics china university of mining and technology xuzhou, china, 221116

Cycle-slip detection is very important in Global Positioning System （GPS） data processing, especially in precise point positioning （PPP）. A new method for detecting cycle slips of the carrier phase measurements based on empirical mode decomposition （EMD） is proposed. The non-differential test volume was detected based on EMD and wavelet. The experiments show that we can obtain good result using EMD method if the cycle slip is within 10. The author also gives some experiments which data were downloaded in IGS. Moreover, comparing with the wavelet method, EMD do not need to select specific parameters, which can avoid the shortcoming caused by selecting not appropriate wavelet base.

关键词： empirical mode decomposition (EMD) precise point positioning (PPP) wavelet Global Positioning System (GPS) carrier phase, cycle slip

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Science china Earth Sciences 2004年第5期47卷 393-404页

作者： JU Yiwen1,2. WANG Guiliang2. JIANG Bo2.& HOU Quanlin1 1. Graduate school, Chinese Academy of Sciences, Beijing 100039, china 2. College of Mineral Resources and Geosciences, china university of mining & technology, xuzhou 2.1008, china Graduate school Chinese Academy of Sciences Beijing 100039 China College of Mineral Resources/Geosci. China University of Mining/Technol. Xuzhou 221008 China

The ductile shearing zones of coal seams in a brittle deformation domain in super-ficial lithosphere are put forward based on the study on bedding shearing and ductile rheology of coal seams. The macrocosmic and microcosmic characteristics include wrinkle fold, mymonitized zones and ductile planar structure of coal seams, etc., while the microcosmic characteristics may also include different optic-axis fabrics and the anisotropy of vitrinite reflectance as well as the change of chemical structure and organic geochemistry components. The forming mechanism is analyzed and the strain environment of ductile shearing zones of coal seams discussed. The result indicates that, in the superficial brittle deformation domain, the coal seams are easy to be deformed, resulting in not only brittle deformation but also ductile shearing deformation under the action of force. Because of simple shearing stress, the interlayer gliding or ductile rheology may take place between coal seams and wall rocks. Therefore, many ductile shearing zones come into being in superficial lithosphere (<5 km). The research on ductile shearing zone of brittle de-formation domain in superficial lithosphere is significant not only theoretically for the study of ductile shearing and ductile rheology of the lithosphere but also practically for the structural movement of coal seams, the formation and accumulation of coal-bed methane, and the preven-tion and harness of gas burst in coal mine.

关键词： brittle deformation domain, interlayer gliding, ductile rheology, ductile shearing zones of coal seams, coal mymonite, vitrinite reflectance anisotropy.

Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

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Science china(Technological Sciences) 2009年第1期52卷 204-209页

作者： DU GaoXiang1,3, ZHENG ShuiLin2.& DING Hao1 1 school of Materials Science and technology,{2. university of Geosciences (Beijing), Beijing, 100083,{2. 2.school of Chemical and environment Engineering, china university of mining and technology (Beijing), Beijing 100083,{2. 3 Hebei Qinghe Refractory Group Co. Ltd., Xingtai 054804,{2. school of Materials Science and technology China University of Geosciences (Beijing) Beijing China Hebei Qinghe Refractory Group Co. Ltd. Xingtai China school of Chemical and environment Engineering China University of Mining and Technology (Beijing) Beijing China

Silica is the major component of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. Compared to the high temperature reaction method, this process is environmental friendly and low cost. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 2..4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the leaching ratio of SiO2.is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. Under the optimum conditions, the leaching ratio of the SiO2.is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major components of the alkali leaching residue are serpentine, talc, quartz and some albite.

关键词： asbestos tailing acid leaching residue sodium hydroxide process optimization

Strategic Thinking for Sustainable Development of mining-Based Cities in china

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Chinese Journal of Population,Resources and environment 2004年第3期2卷 60-63页

作者： Xie Shouxiang, Dai Xichao & Wang Yafen school of Management, china {2. of mining & technology, xuzhou 2.1008, china school of Management China University of Mining and Technology Xuzhou 221008 China

Cities based on mining are distinctive from other cities in china. Their heavy dependence on minerals, a relatively undiversified industrial structure, seriously damaged ecological {2. and the rather low degree of openness have all reduced their competitiveness, and severely constrained and hindered their sustainable development. In this paper the authors will study mining-based cities from the perspective of sustainable development, first by having a critical review of their features, and then by researching into strategic options to support their sustainable development.

关键词： mining-based cities growth strategy utilization of resources

Conceptual design,data model and key techniques of“3D Assistant”

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中国有色金属学会会刊：英文版 2011年第S3期21卷 692-698页

作者： LI Qing-yuan1, ZHANG Xuan2. JIN Yang2. ZHOU Hui3, WANG Qian-jin3,WEI Zhan-yin1 1. Key Laboratory of Geo-informatics, Chinese Academy of Surveying and Mapping, Beijing 100830, china 2. {2. of Geo-Science and Surveying Engineering, china university of mining and technology, Beijing 100083, china 3. {2. of Geomatics, Liaoning Technical university, Fuxin 12.000, china Key Laboratory of Geo-informatics Chinese Academy of Surveying and Mapping Beijing 100830 China school of Geo-Science and Surveying Engineering China University of Mining and Technology Beijing 100083 China school of Geomatics Liaoning Technical University Fuxin 123000 China

Conceptual design, data model and key techniques of "Geo-engineer 3D assistant", an underground 3D GIS oriented to geology and mine application, were discussed. In particular, the importance of high-order smoothing triangular pieces to surface's fine expression in geological modeling was emphasized. The contour mode is the most favorite mode of the three modes about surface expression: DEM, TIN and contour. Topology in underground 3D modeling with CAGD was compared. From the view of boundary and coboundary, which is soul of IS 19107 (Geographic information spatial schema), 3D underground topology was re-examined.

关键词： 3D assistant true 3D GIS fine expression of surface contour mode 3D topology

Indeterminate direction relation model based on fuzzy description framework

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Science china(Technological Sciences) 2008年第S1期51卷 72-80页

作者： LIU YaoLin1,HE JianHua1,YU Yan2.& TANG XinMing3 1 school of Resource and environment Science,Wuhan {2.,Wuhan 430079,china 2.school of Resource and environment Engineer,Wuhan {2. of technology,Wuhan 430070,china 3 Chinese Academy of Surveying and Mapping,Beijing 10083,china school of Resource and environment Science Wuhan University Wuhan China school of Resource and environment Engineer Wuhan University of Technology Wuhan China Chinese Academy of Surveying and Mapping Beijing China

The indetermination of direction relation is a hot topic for fuzzy GIS researchers. The existing models only study the effects of indetermination of spatial objects,but ignore the uncertainty of direction reference framework. In this paper,first a for-malized representation model of indeterminate spatial objects is designed based on quadruple (x,y,A,μ),then a fuzzy direction reference framework is constructed by revising the cone method,in which the partitions of direction tiles are smooth and continuous,and two neighboring sections are overlapped in the transitional zones with fuzzy method. Grounded on these,a fuzzy description model for indeterminate direction relation is proposed in which the uncertainty of all three parts (source object,reference object and reference frame) is taken into account simultaneously. In the end,case studies are implemented to test the rationality and validity of the model.

关键词： direction relation fuzzy description framework fuzzy representation model uncertainty