East China Mineral Exploration and Development Bureau

Nanjing, China

East China Mineral Exploration and Development Bureau

Nanjing, China
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Kong G.-Q.,Hohai University | Wang C.-L.,Chongqing University | Liu H.-L.,Hohai University | Liu H.-L.,Chongqing University | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2017

Energy pile is a new technology which supports the upper building load and extracts geothermal energy from its surrounding simultaneously. However, there is only little research available on the thermal-mechanical behavior of the piles subject to heating-cooling cycles and particularly repeated cycles. Model tests are carried out to examine the heat transfer performance and bearing characteristics of energy pile with embedded steel tube under working loading conditions over repeated temperature cycling, and especially the law of pile head displacement. Moreover, the displacement is also observed and analyzed under no load over one cycle of heating and cooling for comparative analysis. The results show that the heating-cooling cycles produce thermal strain in the pile shaft, heating generates compressive stress and cooling induces the tensile stress. Meanwhile, the positive and negative frictions are yielded in different parts of the pile side due to temperature. The upward displacement magnitude of pile top under no working load is 41% greater than that under working load, but the final displacement of pile top is approximately 10% of that under working load after one heating-cooling cycle. The repeated temperature cycling can lead to continuous accumulation of settlement. © 2017, Science Press. All right reserved.

Liu H.Q.,Nanjing Southeast University | Chen M.,Nanjing Southeast University | Zhao D.,Nanjing Southeast University | Cao Y.,East China Mineral Exploration and Development Bureau
Applied Mechanics and Materials | Year: 2013

Thanks to the technical innovation and new demands of modern society, great changes have taken place in the field of French architecture in the 20th century, especially after World War II. Some pioneers tried to find new ways of building to replace the classical tradition. However, the authorities who lead the opinions of the public clung to their preference of traditional architecture for a long time. Even so, some state buildings in modern style began to emerge in France in the 1950s. Many important public buildings constructed in the period from 1940 to 1960 and their building conditions were studied and the result shows that the shift of French state patronage played an important role in the modernization process. This change resulted from various factors, both internal and external. The event was vital for the French mainstream architecture to keep pace with the times. © (2013) Trans Tech Publications, Switzerland.

Wang L.,Nanjing Southeast University | Mu B.,Nanjing Southeast University | Gong W.,Nanjing Southeast University | Xia A.,East China Mineral Exploration and Development Bureau
Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 | Year: 2015

This paper introduced a new composite foundation that was made up of caisson and piles. The caisson was constructed first, and then piles were bored or jacked through the holes reserved in the concrete floor of the caisson.To study the vertical bearing behavior of composite foundation, four groups of model experiments for single caisson and composite foundation with different piles lengths were performed in sandy soil. The Q - s curves of single caisson and composite foundation in each level load were obtained. The distribution of soil pressure at the bottom of the caisson was given. The axial force and side friction of piles were analyzed. At last, the load bearing ratio of piles with different piles lengths were discussed. The results indicated that the existing of piles could bear the soil pressure, and could enhance the vertical bearing capacity of single caisson, so the vertical bearing capacity of composite foundation was better than that of single caisson. And the enhancement effect was increased with pile length increasing. In general, the caisson could bear the top load and could be used for construction platform in the construction of bridges. The piles under the caisson could control the settlement after the bridges were built. © 2015 Taylor & Francis Group, London.

Lu J.H.,Hohai University | Qin J.H.,East China Mineral Exploration and Development Bureau
Applied Mechanics and Materials | Year: 2013

Prediction problem of large catastrophic landslide is an important applied research topic of geotechnical mechanics. This paper made the detailed geology survey and analysis for the Xiapuzi landslide; based on the analysis of the rainfall data, analyzed landslide body stability under rainfall influence. Using deformation monitoring data, relationships were analyzed between rainfall infiltration time, critical rainfall and total rainfall, with the deformation of landslide, and the relationship between deformations incremental with the rainfall. Results provided a basis for choice of landslide treatment measures. The research accumulated experience for treatment of similar landslide geological disasters. © (2013) Trans Tech Publications, Switzerland.

Han S.-L.,Central South University | Zhang S.-G.,Central South University | Ding J.,Central South University | Xu Z.-F.,East China Mineral Exploration and Development Bureau | Qin X.-L.,East China Mineral Exploration and Development Bureau
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

Taking the iron polymetallic orefield in Taliabu Island, Indonesia as an example, the application of REE geochemistry in discrimination of metallogenic system and the regularities of REE superposition and evolution in the same mineralization system were investigated. The results show that in Taliabu Island, granite, marble, metamorphic sandstone and skarn are the composition parts of the iron polymetallic metallogenic system except for diabase. Ore magma and skarn magnetite ores as well as Cu-Zn sulfide ores are originated from the same metallogenic system. In this system, ore magma type is a relatively independent subsystem, that is, a crystal fractionation system of Indosinian granites; skarn type and hydrothermal filling type belong to another subsystem, that is, a contact metasomatic metallogenic system. Two subsystems belong to a complete mineralization system from magma stage to hydrothermal stage. From ore magma type to skarn type to hydrothermal filling type, negative Eu anomaly decreases, REE fractionation degree increases, and HREE enrichment converts to LREE enrichment gradually. Therefore, REE geochemistry is an effective method in discriminating mineralization system and ore genesis.

Liu Z.,China University of Petroleum - East China | Chen X.-H.,China University of Petroleum - East China | Zhang G.,East China Mineral Exploration and Development Bureau | Wang Z.-M.,Sinopec
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2014

Based on the analysis of basic characteristics of various types of oil and gas reservoirs, some kinds of theoretical reservoir models were established considering four complex reservoirs that include anticlines, faults, pinchout and rock body piercing. Four identifying methods, i.e. trend analysis, difference cutting, wavelet analysis and cellular neural network were used to extract oil and gas gravity anomaly information. These methods were compared and then a combined extraction technology was formed based on the oil and gas reservoir model. The effectiveness of the combined extraction method was verified by processing actual data in Sebei, Three-lake region. The results show that the new method overcomes many shortcomings in popular single extraction methods, improves the reliability of the anomaly extraction, and reduces multiple solutions in the oil and gas prediction. The robustness of the combined extraction method was verified by comparing multiple techniques combining gravity and seismic joint interpretation technology, gravity anomaly regularization downward-continuation technology and apparent density imaging technology.

Wu Z.,State Oceanic Administration | Milliman J.D.,Virginia Institute of Marine Science | Zhao D.,Zhejiang University | Zhou J.,State Oceanic Administration | Yao C.,East China Mineral Exploration and Development Bureau
Global and Planetary Change | Year: 2014

Decreased fluvial water and sediment discharge, increasing land reclamation, changing climate, and rising sea level have had an ever-increasing impact on river deltas, particularly those deltas bordering Southeast Asia. Utilizing 100years of navigational and bathymetric data, together with more than 50years of fluvial discharge data, we here document the impact of human activities on the Pearl River Delta and its estuary at LingDing Bay, China, the site of recent rapid economic expansion and urbanization. Between 1906 and 1988, approximately 80km2, ~1km2/yr, of land was reclaimed from the Bay, almost entirely for agriculture. During the ensuing 20years, 1988-2008, nearly 200km2 of land was reclaimed (10km2/yr), mostly to be used for manufacturing and shipping facilities; even some of the previously reclaimed agricultural land was converted to industrial use. Most of the reclaimed land came from a corresponding loss of intertidal and shallow depths: between 1988 and 2008, the area occupied by supratidal and subtidal flats (-2 to 5m water depths) declined by ~180km2. Channel dredging to accommodate ever larger ships, in contrast, increased areas with depths greater than 10m by about 36km2. Although water volume in the northern bay has decreased by 20% since 1906, decreasing bay area has resulted an overall 15% deepening of the bay. With continued economic expansion in the Pearl River Delta, LingDing Bay should continue to shrink in both area and water volume, although the bay should continue to deepen. © 2014 Elsevier B.V.

Du P.,Nanjing University | Du P.,China University of Mining and Technology | Yuan L.,East China Mineral Exploration and Development Bureau | Xia J.,China University of Mining and Technology | He J.,China University of Mining and Technology
Chinese Geographical Science | Year: 2011

In order to promote the application of Beijing-1 small satellite (BJ-1) remote sensing data, the multispectral and panchromatic images captured by BJ-1 were used for land cover classification in Pangzhuang Coal Mining. An improved Intensity-Hue-Saturation (IHS) fusion algorithm is proposed to fuse panchromatic and multispectral images, in which intensity component and panchromatic image are combined using the weights determined by edge pixels in the panchromatic image identified by grey absolute correlation degree. This improved IHS fusion algorithm outperforms traditional IHS fusion method to a certain extent, evidenced by its ability in preserving spectral information and enhancing spatial details. Dempster-Shafer (D-S) evidence theory was adopted to combine the outputs of three member classifiers to generate the final classification map with higher accuracy than that by any individual classifier. Based on this study, we conclude that Beijing-1 small satellite remote sensing images are useful to monitor and analyze land cover change and ecological environment degradation in mining areas, and the proposed fusion algorithms at data and decision levels can integrate the advantages of multi-resolution images and multiple classifiers, improve the overall accuracy and produce a more reliable land cover map. © 2011 Science Press, Northeast Institute of Geography and Agroecology, CAS and Springer-Verlag Berlin Heidelberg.

Song Z.,Nanjing University | Chen J.,East China Mineral Exploration and Development Bureau | Feng Y.,East China Mineral Exploration and Development Bureau
Applied Mechanics and Materials | Year: 2013

With the development of computer, networking and automation technology, mining information technology becomes more intelligent and more integrated. This paper establishes a smart mine system in one mining enterprise of East China Mineral Exploration and Development Bureau. By adopting service-oriented architecture, smart mine system reuses the existing function modules and integrates the data through Web service to form a comprehensive service system to solve information island problems, which helps to facilitate production, operation and management of mining enterprises. © (2013) Trans Tech Publications, Switzerland.

Wang X.,Nanjing University | Wan Y.,Nanjing University | Hu W.,Nanjing University | Chou I.-M.,Chinese Academy of Sciences | And 3 more authors.
Geochimica et Cosmochimica Acta | Year: 2016

Liquid-liquid immiscibility is gaining recognition as an important process in hydrothermal fluid activity. However, studies of this complex process are relatively limited. We examined liquid-liquid immiscibility in aqueous ZnSO4 solutions at temperatures above ~266.5 °C and at vapor-saturation pressures. The homogeneous aqueous ZnSO4 solution separated into ZnSO4-rich (L1) and ZnSO4-poor (L2) liquid phases coexisting with the vapor phase. The L1-L2 phase separation temperature decreased with increasing ZnSO4 concentration up to 1.0 mol/kg, and then increased at greater ZnSO4 concentrations, showing a typical lower critical solution temperature (LCST) of ~266.5 °C. Gunningite (ZnSO4·H2O) precipitated in 2.0 mol/kg ZnSO4 solution at 360 °C. The L1-L2 phase separation resulted mainly from the strong Zn2+-SO4 2- association at high temperatures. The major results of this study are: (1) the discovery of the LCST in these systems, a macroscale property associated with polymeric mixtures; (2) analyses of the peak area ratios of the v1(SO4 2-) and OH stretching bands, which suggest that the sulfate concentration increases with increasing temperature in L1, especially above 375 °C; (3) a new Raman v1(SO4 2-) mode at ~1005 cm-1 observed only in the L1 phase, whose fraction increases with increasing temperature; and (4) the shape of the OH Raman stretching band, which indicates that water molecules and solute interact much more strongly in L1 than in the coexisting L2 phase, suggesting that water molecules fit into the framework formed by various Zn2+-SO4 2- pairs and chain structures in L1. These results have potential implications for understanding transport and reduction of seawater-derived sulfate in submarine hydrothermal systems. The formation of an immiscible sulfate-rich liquid phase can favor the circulation of sulfate within mid-ocean ridge basalt because the sulfate-rich liquid density is higher than that of the coexisting fluid. The reduction of sulfate could also be accelerated because sulfate is locally concentrated and strong Zn2+-SO4 2- association increases the reactivity of sulfate. © 2016 Elsevier Ltd.

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