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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. Source

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. Source

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. Source

Gao W.,Wuhan University | Stein A.,International Institute for Geo information Science and Earth Observation | Yang L.,Huawei | Hou J.,East China Mineral Exploration and Development Bureau | And 2 more authors.
Cartographic Journal | Year: 2016

A proper characterization of land-use types is critical for constructing generalization constraints to guide and control landuse data generalization. This paper focused on identification and utilization of their importance based upon land-use distributions and application themes. First, this importance was identified using a three-step method that links a diversity index, a multiple attribute decision model and a spatial association analysis. Second, with the importance, a mathematical function was designed to determine minimum area thresholds of land-use polygons as an example of generalization constraints. Third, the importance was used to assist in the selection of generalization operators and evaluation of generalization outcomes. Fourth, a land-use dataset at 1:10 000, describing the land use of a typical rural area in Hubei province of China, was generalized towards a 1:50 000 dataset to verify the effects of the presented method and function. Three additional tests were implemented to analyze the sensitivity of the importance of land-use types on setting the minimum area threshold and generalization operations. The outcome showed that the proposed methods and functions make land-use data generalization more adaptable for in-use datasets and applications. © 2016, © The British Cartographic Society 2016. Source

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. Source

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