Entity

Time filter

Source Type


Huanhuan L.,Captial Norrmal University | Youquan Z.,Captial Norrmal University | Rong W.,Beijing Institute of Hydrogeology and Engineering Geology
3rd International Workshop on Earth Observation and Remote Sensing Applications, EORSA 2014 - Proceedings | Year: 2014

Beijing-Tianjin high-speed railway is China's first high-speed passenger rail lines. Its high-speed has strict requirements of rail deformation. The Beijing-Tianjin high-speed rail across the Chaoyang and Tongzhou where affect land subsidence. It mainly affects the track ride and security due to performance of the regional uneven settlement. The research has shown that: the large pumping of groundwater is the main reason of causing land subsidence along Beijing-Tianjin high-speed railway. At the same time, it is also affected by tectonic environment, sedimentary environments and secondary consolidation of the soil etc. Therefore, it need limiting the groundwater pumping near the Beijing-Tianjin high-speed railway. In addition, optimizing the groundwater extraction program and strengthen groundwater monitoring is also necessary. Groundwater recharge is need if there is severely land subsidence. © 2014 IEEE. Source


Chen B.-B.,Capital Normal University | Gong H.-L.,Capital Normal University | Li X.-J.,Capital Normal University | Lei K.-C.,Capital Normal University | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

The excessive mining for underground water is the main reason inducing the land subsidence in Beijing, while, increasing of load brought by the urban construction aggravate the local land subsidence in a certain degree. As an international metropolis, the problems of land subsidence that caused by urban construction are becoming increasingly highlights, so revealing the relationship between regional load increase and the response of land subsidence also becomes one of the key problems in the land subsidence research field. In order to analyze the relationship between the load changes in construction and the land subsidence quantitatively, the present study selected the TM remote sensing image covering Beijing plain and used Erdas Modeler tool to invert the index based on building site (IBI), acquired the spatial and temporal change information in research area further; Based on results monitored by PS-InSAR (permanent scatterer interferometry) and IBI index method, and combined with the GIS spatial analysis method in the view of pixels in different scales, this paper analyzes the correlation between typical area load change and land subsidence, The conclusions show that there is a positive correlation between the density of load and the homogeneity of subsidence, especially in area which has a high sedimentation rate. Owing to such characteristics as the complexity and hysteretic nature of soil and geological structure, it is not obvious that the land subsidence caused by the increase of load in a short period. But with the increasing of local land load made by high density buildings and additional settlement of each monomer building superposed with each other, regional land subsidence is still a question that cannot be ignored and needs long-term systematic research and discussion. Source


Wu Q.,China University of Mining and Technology | Liu Y.,China University of Mining and Technology | Liu Y.,Beijing Institute of Hydrogeology and Engineering Geology | Liu D.,China University of Mining and Technology | And 2 more authors.
Rock Mechanics and Rock Engineering | Year: 2011

Floor water inrush represents a geohazard that can pose significant threat to safe operations for instance in coal mines in China and elsewhere. Its occurrence is controlled by many factors, and the processes are often not amenable to mathematical expressions. To evaluate the water inrush risk, the paper proposes the vulnerability index approach by coupling the analytic hierarchy process (AHP) and geographic information system (GIS). The detailed procedures of using this innovative approach are shown in a case study in China (Donghuantuo Coal Mine). The powerful spatial data analysis functions of GIS was used to establish the thematic layer of each of the six factors that control the water inrush, and the contribution weights of each factor was determined with the AHP method. The established AHP evaluation model was used to determine the threshold value for each risk level with a histogram of the water inrush vulnerability index. As a result, the mine area was divided into five regions with different vulnerability levels which served as general guidelines for the mine operations. The prediction results were further corroborated with the actual mining data, and the evaluation result is satisfactory. © Springer-Verlag 2011. Source


Chen B.,Capital Normal University | Gong H.,Capital Normal University | Li X.,Capital Normal University | Lei K.,Capital Normal University | And 3 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2013

Increasing of load brought by the urban construction aggravate the local land subsidence. As an international metropolis, land subsidence that caused by urban construction are becoming highlight increasingly in Beijing, China, so revealing the relationship between regional load increase and land subsidence also becomes a key problem. TM remote sensing image covering Beijing plain were selected and Erdas Modeler tool was used to calculate the index basing on building site (IBI), acquiring spatial and temporal change information of build-up area. Basing on deformation information monitored by PS-InSAR (permanent scatterer interferometry) technology and IBI index, combining with GIS spatial analysis method in the three different sampling ranges, the correlation between InSAR annual subsidence rate and IBI index was analyzed. The conclusions show that there is positive correlation between load density and uneven settlement, the higher settlement rate, the higher spearman rank correlation coefficient. Compared to the static load, the impact of combined dynamic and static load to land subsidence is more obvious. It is not obvious for the influence to land subsidence caused by the increase of load in a short period. Source


Zhang Y.,Capital Normal University | Gong H.,Capital Normal University | Gu Z.,Capital Normal University | Wang R.,Beijing Institute of Hydrogeology and Engineering Geology | And 2 more authors.
Hydrogeology Journal | Year: 2014

The plain of Beijing city in China suffers severe land subsidence owing to groundwater overdraft. The maximum subsidence rate could reach 6 cm/year through the 2000s. An integrated subsidence-monitoring program was designed, including levelling survey, borehole extensometers and multilayer monitoring of groundwater level, with the aim to understand both hydrological and mechanical processes and to characterize the land subsidence. From multilayer compaction monitoring, the major compression layers were identified. The major strata contributing to compression deformation are the second (64.5-82.3 m) and third (102-117 m) aquitards, which contributed around 39 % of the total subsidence. Meanwhile, irrecoverable deformations were also observed in the second (82.3-102 m) and third (117-148 m) confined aquifers; they exhibit elasto-plastic mechanical behavior, which is attributed to the thin beds of silt or silty clay. Stress-strain analysis and oedometer tests were conducted to study the aquifer-system response to pumping and to estimate the specific storage of the major hydrogeologic units. The results reveal the creep behavior and elasto-plastic, visco-elasto-plastic mechanical behavior of the aquitards at different depths. The compressibility of the aquitards in the inelastic range is about one order of magnitude larger than for the elastic range. © 2013 Springer-Verlag Berlin Heidelberg. Source

Discover hidden collaborations