检索结果-南通市图书馆

Estimation of ground deformation Caused by the Earthquake (M7.2) in Japan,2008,from the Geomorphic Image Analysis of High Resolution LiDAR DEMs

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2011年第2期8卷 239-245页

作者： MUKOYAMA Sakae Department of Research & Development of Kokusai Kogyo Co. Ltd.

In this study, a new method for quantitative and efficient measurement for the ground surface movement was developed. The feature of this technique is to identify geomorphic characteristics by image matching analysis, using the intelligent images made from high resolution DEM(Digital Elevation Model). This method is useful to extract the small ground displacement where the surface shape was not intensely deformed.

关键词： ground deformation ground surface movement Digital Elevation Model(DEM) Geomorphic image analysis Japan

A Feasible Approach for Improving Accuracy of ground deformation Measured by D-InSAR

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第2期17卷 262-266页

作者： CHANG Zhan-qiang GONG Hui-li ZHANG Jing-fa GONG Li-xia College of Resource Environment ＆ Tourism Capital Normal University Beijing 100037 China Key Lab of 3D Information Acquisition and Application Ministry of Education Beijing 100037 China Institute of Crustal Dynamics National Seismological Bureau Beijing 100085 China

D-InSAR is currently one of the most popular research tools in the field of Microwave Remote Sensing. It is unrivaled in its aspect of measuring ground deformation due to its advantages such as high resolution,continuous spa-tial-coverage and dynamics. However,there are still a few major problems to be solved urgently as a result of the intrin-sic complexity of this technique. One of the problems deals with improving the accuracy of measured ground deforma-tion. In this paper,various factors affecting the accuracy of ground deformation measured by D-InSAR are systemati-cally analyzed and investigated by means of the law of measurement error propagation. At the same time,we prove that the ground deformation error not only depends on the errors of perpendicular baselines as well as the errors of the inter-ferometric phase for topographic pair and differential pair,but also on the combination of the relationship of perpen-dicular baselines for topographic pairs and differential pairs. Furthermore,a feasible approach for improving the accu-racy of measured ground deformation is proposed,which is of positive significance in the practical application of D-InSAR.

关键词： D-InSAR ground deformation perpendicular baseline interferometric phase

Advances in space-borne SAR interferometry and its application to ground deformation monitoring

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2011年第2期17卷 163-170页

作者： LIU Zhen-guo BIAN Zheng-fu Jiangsu Key Laboratory of Resources and Environmental Information Engineering Xuzhou 221116 China School of Environment Science ＆ Spatial Informatics China University of Mining and Technology Xuzhou 221116 China

The development of Differential Synthetic Aperture Radar Interferometry （D-InSAR）, in terms of its evolution from classic to advanced forms, such as Least-Squares approach, Permanent Scatterer Interferometry, Small Baseline Subset, and Coherent Pixel Technique, is reviewed, describing concisely the main principles of each method and highlighting the difference and relationship between them. Applications of InSAR technology in China were then introduced, together with the obstacles to overcome and feasible strategies, such as integrating MERIS/MODIS data to compensate for the atmospheric effect and GPS, and multi-platform SAR data to make InSAR technique practical and operational under various conditions. The latest devel- opments were then analyzed along with high-quality SAR data, available thanks to the newly launched high-tech satellites, TerraSAR-X, and Cosmo Sky-med, and conclusions were drawn about the main limitations of the technique.

关键词： InSAR ground deformation permanent scatterer mining subsidence

Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第7期23卷 564-578页

作者： Jia-xin LIANG Xiao-wu TANG Tian-qi WANG Yu-hang YE Ying-jing LIU Research Center of Coastal and Urban Geotechnical Engineering Department of Civil EngineeringZhejiang UniversityHangzhou310058China Engineering Research Center of Urban Underground Space Development of Zhejiang Province Hangzhou310058China Zhongtian Construction Group Co. Ltd.Hangzhou310020China

When tunnels are constructed in coastal cities,they will inevitably undercross a *** the influence of rivers on tunnelling-induced deformation in costal soft soil is of great significance for controlling excessive settlement and protecting surrounding *** paper presents a case study of twin tunnels undercrossing a river in soft soil in Hangzhou,*** soft soil of Hangzhou refers to cohesive soil in a soft plastic or fluid plastic state with high natural water content,high compressibility,low bearing capacity,and low shear *** the influence of the river,the research region was divided into two parts,inside and outside the river-affected area,based on monitoring data of the Zizhi *** development law of surface settlement is divided into three *** the first and second stages,the surface settlement within and outside the river-affected area showed a similar trend:the settlement increased and the growth rate of settlement in the second stage was smaller within the river-affected *** the third stage,the surface settlement continued to increase within the river-affected area,while it converged outside the river-affected *** the river-affected area,there was an asynchronization of the sinking rate and stability of vault settlements and surface settlements.A numerical model was established by simulating different reinforcements of the *** numerical model revealed that the ground movement is influenced by the distribution and amount of the excess pore water *** excess pore pressure was concentrated mostly in the range of 1.0H_(t)-3.0H_(t)(H_(t) is the tunnel height)before the tunnel face,especially within the river-affected *** the river-affected area,the dissipation of excess pore water pressure needs more time,leading to slow stabilization of surface *** undercrossing a river,a cofferdam is necessary to reduce excessive ground deformation by dispersing the distribution o

关键词： Tunnelling ground deformation Numerical analysis Reinforcement

Estimation of ground deformation in Landslide Prone Areas Using GPS: A Case Study of Bududa, Uganda

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2021年第3期12卷 213-232页

作者： Brian Makabayi Moses Musinguzi John Richard Otukei Department of Geomatics and Land Management Makerere University Kampala Uganda

Landslides are a frequent phenomenon on mountain Elgon, particularly in Bududa district on the SW side of this extinct shield volcano. Landslides have led to the destruction of property and loss of life we, therefore, need to monitor them. Monitoring how landslides build-up makes it possible to timely evacuate people and build barriers to protect property against damage by landslides. Residents in Bududa have reported cracks developing in the ground and houses. These cracks continue to grow, suggesting a future catastrophic event. Such an event may resemble the 2010 landslide in Bududa, which killed approximately 450 people and destroyed much property. In order to mitigate the consequences of a new landslide as much as possible, we monitored ground motion in Bududa in eleven stations from June 2018 to June 2019. Six-hour session GPS observations were made, and deformation was determined over the observation period, June to September 2018, September to November 2018, November 2018 to February 2019 and February to June 2019. A congruency test was performed to determine how significant the deformation was. It appeared that the ground deformation differed largely at various monitored stations, ranging from 0.004 to 0.076 m, 0.001 to 0.067 m and 0 to 0.078 m in the East, North and vertical directions respectively. The values indicate that most slopes in the district are unstable, particularly in the wet seasons, which implies that future landslides pose a high risk for society.

关键词： Bududa GPS ground deformation Natural Hazards

Computational implementation of a GIS developed tool for prediction of dynamic ground movement and deformation due to underground extraction sequence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2016年第4期3卷 379-398页

作者： Yue Cai Yujing Jiang Baoguo Liu Ibrahim Djamaluddin School of Civil Engineering Beijing Jiaotong University No.3 Shangyuan Village Haidian Diatrict Beijing 100044China 3raduate School of Engineering Nagasaki University 1-143 unkyo-machi Nagasaki 8528521 Japan State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology Shandong University of Scienceand Technology Qingdao 166510 China Faculty of Engineering Hasanuddin University Jalan Poros Malino KM 6 Bontomarannu Gowa South Sulawesi 92171Indonesia

In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational methods have been supported in civil engineering, subsidence engineering and mining engineering practice. However, ground movement problem due to mining extraction sequence is effectively four dimensional （4D）. A rational prediction is getting more and more important for long-term underground mining planning. Hence, computer-based analytical methods that realistically simulate spatially distributed time-dependent ground movement process are needed for the reliable long-term underground mining planning to minimize the surface environmental damages. In this research, a new computational system is developed to simulate four-dimensional （4D） ground movement by combining a stochastic medium theory, Knothe time-delay model and geographic information system （GIS） technology. All the calculations are implemented by a computational program, in which the components of GIS are used to fulfill the spatial-temporal analysis model. In this paper a tight coupling strategy based on component object model of GIS technology is used to overcome the problems of complex three-dimensional extraction model and spatial data integration. Moreover, the implementation of computational of the interfaces of the developed tool is described. The GIS based developed tool is validated by two study cases. The developed computational tool and models are achieved within the GIS system so the effective and efficient calculation methodology can be obtained, so the simulation problems of 4D ground movement due to underground mining extraction sequence can be solved by implementation of the developed tool in GIS.

关键词： Computational model Geographical information system - Component object model - Complex mining geometry ground deformation Surface subsidence

Monitoring and mechanisms of ground deformation and ground fissures induced by cut-and-fill mining in the Jinchuan Mine 2,China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monitoring and mechanisms of ground deformation and ground f...

Construction strategies for a NATM tunnel in Sao Paulo, Brazil, in residual soil

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Haijun Zhao Fengshan Ma Yamin Zhang Jie Guo Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences

As an advanced mining technology,cut-and-fill mining was successfully applied in the Jinchuan Nickel Mine over 18 years until the end of 1999 when ground fissures occurred above the ore *** the first field investigation of the ground fissures in 2000 and the establishment of GPS monitoring network in 2001,ground deformation and damage has been continuously monitored and researched for the last 10 *** the end of 2010,the maximum vertical displacement reached 1,720 mm and accompanied by the rapid development of ground *** study considers the effects of large-scale stress adjustment and redistribution, hysteretic backfill,low strength of filling body,unfilled void space,as well as repeated mining activities concurrently caused ground deformation and ground ***,the hysteretic mechanisms of ground response relative to the mining operations and the mechanisms of displacement variations are discussed from different *** results provide invaluable information on designing and building mines with the cut-and-fill method.

关键词： Cut-and-fill mining ground deformation ground fissure Mechanism

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Underground Space 2022年第1期7卷 1-18页

作者： Osvaldo P.M.Vitali Tarcisio B.Celestino Antonio Bobet Lyles School of Civil Engineering Purdue UniversityWest LafayetteIN 47907USA Sao Carlos School of Engineering University of Sao PauloSao CarlosSP 13566Brazil

Due to the fast growth of urban areas worldwide,the demand for tunnels in developed areas is *** design and construc-tion of those tunnels are complex because of their shallow depths and their interaction with existing aboveground and buried structures,which results in rather limited allowable ground deformations induced by the tunnel excavation and *** tropical regions,residual porous soils near the surface are *** soils are highly deformable;thus,tunneling may induce large ground deformations that may damage nearby *** new Austrian tunneling method(NATM)and the sprayed concrete lining(SCL)technique are being widely employed in several big cities in tropical regions,but little research has been conducted to assess the induced ground deformations in residual soils,common in tropical *** paper provides insight into this issue.A well-documented metro tunnel in Sa˜o Paulo,Brazil,in a residual red porous clay,was analyzed using 3D finite element method(FEM).The behavior of the residual red porous clay was approximated by an advanced constitutive soil model calibrated with triaxial tests on intact samples extracted at the *** of the tunnel deformations during construction matched the field *** calibrated model was then used to explore the tunnel per-formance under different construction *** influence of partial face excavation,unsupported span length,support stiffness and pipe roof umbrella were *** numerical results showed that partial face excavation was effective to reduce ground deformations ahead of the face of the tunnel and to improve face stability;however,the settlements behind the face increased because of the delay in closing the primary *** installation of a stiffer liner closer to the face reduced the ground deformations *** pipe roof umbrella was the most effective technique to reduce the ground deformations around the tunnel;however,the numerical results

关键词： Tunnel NATM Residual soil FEM 3D face effects ground deformation Face stability

Factors that affect coseismic folds in an overburden layer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2018年第1期12卷 17-23页

作者： Shaogang ZENG Yongen CAI Department of Geophysics Peking University Beijing 100871 China Deep Water Exploration Group Research Institute CNOOC Nanhai East Petroleum Bureau Guangzhou 510200 China

Coseismic folds induced by blind thrust faults have been observed in many earthquake zones, and they have received widespread attention from geologists and geophysicists. Numerous studies have been conducted regarding fold kinematics; however, few have studied fold dynamics quantitatively. In this paper, we establish a conceptual model with a thrust fault zone and tectonic stress load to study the factors that affect coseismic folds and their formation mechanisms using the finite element method. The numerical results show that the fault dip angle is a key factor that controls folding. The greater the dip angle is, the steeper the fold slope. The second most important factor is the overburden thickness. The thicker the overburden is, the more gradual the fold. In this case, folds are difficult to identify in field surveys. Therefore, ifa fold can be easily identified with the naked eye, the overburden is likely shallow. The least important factors are the mechanical parameters of the overburden. The larger the Young＇s modulus of the overburden is, the smaller the displacement of the fold and the fold slope. Strong horizontal compression and vertical extension in the overburden near the fault zone are the main mechanisms that form coseismic folds.

关键词： ground deformation coseismic fold blindthrust fault finite element method