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Calculation of maximum ground movement and deformation caused by mining

中国有色金属学会会刊：英文版 2011年第S3期21卷 562-569页

作者： LI Pei-xian1, 2. TAN Zhi-xiang1, 2. DENG Ka-zhong1, 2.1. key laboratory for Land {2. and Disaster Monitoring of State Bureau of Surveying and Mapping, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 2. Jiangsu key laboratory of Resources and {2.al Information Engineering, {2. University of Mining and Technology, Xuzhou 2.1116, {2. [a] key laboratory for Land {2. and Disaster Monitoring of State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu key laboratory of Resources and {2.al Information Engineering China University of Mining and Technology Xuzhou 221116 China

In order to know the maximum mining ground deformation of arbitrary surface point, directions of the maximum surface tilt, curvature,horizontal displacement and horizontal deformation caused by multi-working faces were deduced based on probability integral method. The distribution forms of surface deformations in all direction φ∈[0, 2.] were obtained and also equations of maximum deformations were given based on calculation of mining ground deformation in direction φ. A mining subsidence analysis system was developed with VB6.0. The system implements the probability integral mining subsidence prediction with direct integration method, and it can avoid errors of arbitrary shaped working face subdivision of traditional method, and accuracy of mining subsidence prediction can be improved with the direct integral method. The system implements the contour chart and profile chart and also data analysis automation by manipulation of the SURFER kernel function and it complements the defect of existing subsidence prediction software. Calculation of maximum deformations caused by multi-working faces mining in a coal mine of Xuzhou, china was shown as application example. Engineering application indicates that maximum deformation of mining ground surface can be calculated and analyzed by the system. The research provides a theoretical basis and calculation tool for mining subsidence prediction and analysis.

关键词： mining subsidence probability integral method movement and deformation system development

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A new method for mining deformation monitoring with GPS-RTK

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中国有色金属学会会刊：英文版 2011年第S3期21卷 659-664页

作者： GAO Jing-xiang1, 2. LIU Chao2. WANG Jian1, 2. LI Zeng-ke2. MENG Xiang-chao2.1. key laboratory for Land {2. and Disaster Monitoring of State Bureau of Surveying and Mapping, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 2. School of {2. and Spatial Informatics, {2. University of Mining and Technology, Xuzhou 2.1116, {2. [a] key laboratory for Land {2. and Disaster Monitoring of State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] School of environment and Spatial Informatics China University of Mining and Technology Xuzhou 221116 China

Based on ranging intersection theory, a new method which is simple and easy to operate was proposed for data collection in the mine surface deformation monitoring with GPS-RTK centering rod measurements. It can fully eliminate the inevitable shaking error and the vertical deflection, and to some extent weaken the multipath effect on the estimates of coordinates in a relatively short period of time, using high-frequency observations. The results show that three-dimensional coordinates with a height accuracy better than 1 cm, horizontal accuracy better than 2.4 cm can be achieved through only 15-30 s continuous observation by 2. Hz high-frequency and effectively improve the measurement accuracy and efficiency of RTK, fully satisfying the high-speed and high-precision data acquisition in mine surface subsidence deformation monitoring.

关键词： GPS rover pole multipath delay deformation monitoring

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Statistical analysis and model of spread F occurrence in china

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Science china(Technological Sciences) 2010年第6期53卷 1725-1731页

作者： XU Tong1,WU ZhenSen2.HU YanLi1,WU Jian1,SUO YuCheng1 & FENG Jian1 1 national key {2. of {2. environment,china Research Institute of Radiowave Propagation,qingdao 2.6107,china 2.School of Science,Xidian University,Xi’an 710071,china 1. national key {2. of {2. environment China Research Institute of Radiowave Propagation Qingdao 266107 China2. School of Science Xidian University Xi’an 710071 China

The spread F data obtained over Lanzhou (36.1°N,103.9°E),Chongqing (2..5°N,106.4°E) and Haikou (2..0°N,110.3°E) of china during the period from 1978 to 1997 are used to analyze the occurrence *** statistical results show that the post midnight spread F occurrence is maximum during the summer solstice months of the lower solar activity period,while post sunset spread F is dominant in equinoxes of higher solar activity period over Haikou *** Chongqing and Lanzhou stations,spread F mostly occurs at post midnight and relates negatively with solar *** regression method and Fourier expansion,the preliminary single-station model of spread F occurrence is established and the accuracy of the model is evaluated.

关键词： spread F solar cycle variation seasonal variation empirical model

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Super-orthogonal space-time code design based on the trellis diagram integrated operation

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Science china(Information Sciences) 2011年第7期54卷 1481-1490页

作者： AO Jun 1,2.MA ChunBo 1,AO FaLiang 1 & LIAO GuiSheng 3 1 College of Information and Communication,Guilin University of Electronic and Technology,Guilin 541004,china 2.national key laboratory of electromagnetic environment,{2.,2.6107,china 3 national Lab of Radar Signal Processing,Xidian University,Xi’an 710071,china 1. College of Information and Communication Guilin University of Electronic and Technology Guilin 541004 China2. National Key Laboratory of Electromagnetic Environment QingDao 266107 China3. National Lab of Radar Signal Processing Xidian University Xi’an 710071 China

By studying the super-orthogonal space-time coding designs for 2.transmit antennas and superquasi orthogonal space-time coding designs for 4 transmit antennas,a novel super-orthogonal space-time coding design for 4 transmit antennas is *** exploiting the inherent structure association between OSTBC and QOSTBC,the proposed schemes can obtain the full-rate and good performance while keeping the coding complexity as super-orthogonal space-time coding schemes for 2.transmit *** results demonstrate that the proposed schemes outperforms the existing super-quasi orthogonal space-time coding schemes by almost 2.dB.

关键词： STBC TCM SOSTTC SQOSTTC

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GPS short-delay multipath estimation and mitigation based on least square method

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Journal of Systems Engineering and Electronics 2009年第5期20卷 954-961页

作者： Zhang Shengkang~(1,2.,Wang Hongbo~(1,2.,Yang Jun~(1,2. & He Leiming~(1,2. 1.Beijing Inst.of Radio Metrology and Measurement,Beijing 100854,P.R.china 2.national {2. {2. of Metrology and Calibration Technology,Beijing 100854,P.R.china Beijing Inst. of Radio Metrology and Measurement Beijing 100854 P. R. China National Key Laboratory of Metrology and Calibration Technology Beijing 100854 P. R. China

The GPS multipath signal model is presented, which indicates that the coherent DLL outputs in multipath environment are the convolution between the ideal DLL outputs and the channel responses. So the channel responses can be estimated by a least square method using the observed curve of the DLL discriminator. In terms of the estimated multipath channels, two multipath mitigation methods are discussed, which are equalization filtering and multipath subtracting, respectively. It is shown, by computer simulation, that the least square method has a good performance in channels estimation and the multipath errors can be mitigated almost completely by either of the methods. However, the multipath subtracting method has relative small remnant errors than equalization filtering.

关键词： global positioning system short-delay least square method multipath mitigation.

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Genesis of ^(2.0)Th excess in basalts from mid-ocean ridges and ocean islands:Constraints from the global U-series isotope database and major and rare earth element geochemistry

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Science china Earth Sciences 2010年第10期53卷 1486-1494页

作者： ZHANG GuoLiang1,2.& ZENG ZhiGang1 1 key laboratory of Marine Geology and {2.,Institute of Oceanology,Chinese Academy of Sciences,{2. 2.6071,china 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,china 1. key laboratory of Marine Geology and {2. Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

Based on 2.0Th-2.8U disequilibrium and major element data from mid-ocean ridge basalts(MORBs) and ocean island basalts(OIBs),this study calculates mantle melting parameters,and thereby investigates the origin of 2.0Th excess.(2.0Th/2.8U) in global MORBs shows a positive correlation with Fe8,Po,Na8,and Fmelt(Fe8 and Na8 are FeO and Na2. contents respectively after correction for crustal fractionation relative to MgO = 8 wt%,Po=pressure of initial melting and Fmelt=degree of melt),while 2.0Th excess in OIBs has no obvious correlation with either initial mantle melting depth or the average degree of mantle ***,compared with the MORBs,higher(2.0Th/2.8U) in OIBs actually corresponds to a lower melting *** suggests that the 2.0Th excess in MORBs is controlled by mantle melting conditions,while the 2.0Th excess in OIBs is more likely related to the deep garnet *** vast majority of calculated initial melting pressures of MORBs with excess 2.0Th are between 1.0 and 2.5 GPa,which is consistent with the conclusion from experiments in recent years that DU>DTh for Al-clinopyroxene at pressures of >1.0 *** initial melting pressure of OIBs is 2.2.3.5 GPa(around the spinel-garnet transition zone),with their low excess 2.6Ra compared to MORBs also suggesting a deeper mantle ***,excess 2.0Th in MORBs and OIBs may be formed respectively in the spinel and garnet stability *** addition,there is no obvious correlation of K2./TiO2.with(2.0Th/2.8U) and initial melting pressure(Po) of MORBs,so it is proposed that the melting depth producing excess 2.0Th does not tap the spinel-garnet transition *** and MORBs in both(2.0Th/2.8U) vs.K2./TiO2.and(2.0Th/2.8U) *** plots fall in two distinct areas,indicating that the mineral phases which dominate their excess 2.0Th are ***/Yb-Ce curves of fast and slow ridge MORBs are similar,while,in comparison,the Ce/Yb-Ce curve for OIBs shows more influence from *** mechanism

关键词： excess 2.0Th clinopyroxene garnet spinel-lherzolite mid-ocean ridge ocean island

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Subsidence control and farmland conservation by solid backfilling mining technology

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中国有色金属学会会刊：英文版 2011年第S3期21卷 665-669页

作者： GUO Guang-li1, 2. FENG Wen-kai3, ZHA Jian-feng1, 2. 3, LIU Yuan-xu1, 2. WANG Qiang1, 2.1. key laboratory for Land {2. and Disaster Monitoring of the State Bureau of Surveying and Mapping, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 2. Jiangsu key laboratory of Resources and {2.al Information Engineering, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 3. State key laboratory of Geohazard Prevention and Geo{2. Protection, Chengdu University of Technology, Chengdu 610059, {2. [a] key laboratory for Land {2. and Disaster Monitoring of the State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu key laboratory of Resources and {2.al Information Engineering China University of Mining and Technology Xuzhou 221116 China [c] State key laboratory of Geohazard Prevention and Geo{2. Protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining technology, which decreases the height of fissure zone and caving zone, and alleviates the subsidence, is a new technology for farmland conservation. Based on the situation analysis of farmland destruction in mining area, three ways for farmland protection were proposed. In order to improve the feasibility of this technology, the limited filling materials should be used to increase resources recovery ratio, and then the surplus materials could be backfilled into goaf. An index, namely farmland conservation ability, was put forward to optimize the ways for farmland conservation. At last, the Wanbei coal mine was taken as a case for farmland conservation. It was shown that 32.0 t dull coal was substituted and 52.hm2.farmland was conserved by solid backfilling mining in this coal mine.

关键词： solid backfilling farmland conservation mining subsidence equivalent mining height

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Sediment transport capacity of hyperconcentrated flow

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Science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 961-975页

作者： SHU AnPing1,2.& FEI XiangJun2.1 School of environment & key {2. of Water and Sediment Sciences,Ministry of Education,Beijing Normal University,Beijing 100875,{2. 2.State key {2. of Hydroscience and Engineering,Tsinghua University,Beijing 100084,{2. School of environment & key {2. of Water and Sediment Sciences Ministry of Education Beijing Normal University Beijing 100875 China State key laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

As one of the most important components of river mechanics,sediment transport capacity of sediment-laden flows has attracted much attention from many researchers working on river mechanics and hydraulic engineering. Based on the time-averaged equation for a turbulent energy equilibrium in solid and liquid two-phase flow,an expression for the efficiency coefficient of suspended load movement was derived for the two-dimensional,steady,uniform,fully-developed turbulent flow. A new structural expression of sediment transport capacity was achieved. Using 115 runs of flume experimental data,which were obtained through two kinds of sediment transport experiments in the state of equilibrium,in combination with the basic rheological and sediment transporting characteristics of hyperconcentrated flow,the main parameters in the structural expression of sediment transport capacity were calibrated,and a new formula of sediment transport capacity for hyperconcentrated flow was developed. A large amount of field data from the Yellow River,Wuding River,and Yangtze River,etc. were adopted to verify the new formula and good agreement was obtained. These results above contribute to an improved theoretical system of river mechanics and a reliable tool for management of rivers carrying high concentration of sediments.

关键词： hyperconcentrated flow turbulent energy equilibrium efficiency coefficient sediment transport capacity

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Analysis of the contribution of acid phosphatase to P efficiency in Brassica napus under low phosphorus conditions

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Science china(Life Sciences) 2010年第6期53卷 709-717页

作者： ZHANG HaiWei1,2.HUANG Yu2.YE XiangSheng2.& XU FangSen1,2.1 national key {2. of Crop Genetic Improvement,Huazhong Agricultural University,Wuhan 430070,{2. 2.key {2. of Subtropical Agriculture and environment,Ministry of Agriculture,Huazhong Agricultural University,Wuhan 430070,{2. 1. national key {2. of Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 China2. Key Laboratory of Subtropical Agriculture and Environment Ministry of Agriculture Huazhong Agricultural University Wuhan 430070 China

To understand whether genotypic variation in acid phosphatase (APase) activity in rapeseed (Brassica napus L.) induced by phosphorus (P) deficiency has impact on P efficiency,soil APase activity in the rhizosphere for rapeseed P-efficient genotype 102.and P-inefficient genotype 105 was measured against organic and inorganic P sources in the pot experiment,and the activities of root-secreted APase and leaf intracellular APase were investigated in different P-starvation periods in the nutrient *** activity of root-secreted APase in *** was induced under low P ***,P nutrition and P uptake efficiency of the plants supplied with organic P were not directly related to the activity of root-secreted APase due to several confounding factors affecting APase *** higher activity of leaf APase improved P remobilization in plants and played important roles in enhancing P use efficiency,shown by the significant correlation between leaf APase activity and P use efficiency in a rapeseed recombinant inbred population of 135 lines.

关键词： Brassica napus APase activity P remobilization P efficiency low-P stress

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Mining subsidence control by solid backfilling under buildings

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中国有色金属学会会刊：英文版 2011年第S3期21卷 670-674页

作者： ZHA Jian-feng1, 2. 3, GUO Guang-li1, 2. FENG Wen-kai3, WANG Qiang1, 2.1. key laboratory for Land {2. and Disaster Monitoring of the State Bureau of Surveying and Mapping, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 2. Jiangsu key laboratory of Resources and {2.al Information Engineering, {2. University of Mining and Technology, Xuzhou 2.1116, {2. 3. State key laboratory of Geohazard Prevention and Geo{2. Protection, Chengdu University of Technology, Chengdu 610059, {2. [a] key laboratory for Land {2. and Disaster Monitoring of the State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu key laboratory of Resources and {2.al Information Engineering China University of Mining and Technology Xuzhou 221116 China [c] State key laboratory of Geohazard Prevention and Geo{2. Protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining can reduce the buildings' damage caused by mining greatly. The reduction of subsidence value, the slow advancing speed and the subsidence caused by backfilling body compaction are the main reasons that solid backfilling mining velocity decreases significantly. Based on the research of mechanism, some principles on subsidence control of solid backfilling mining under buildings were proposed. The equivalent mining height was designed according to the fortification criteria of buildings and their attachment structures, which enables the ground movement and deformation caused by mining to be less than the corresponding fortification criteria.

关键词： solid backfilling mining subsidence control mining under buildings

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