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Pu J.,Qingdao Geotechnical Investigation and Surveying Research Institute | Xu J.,Ocean University of China | Li G.,Key Laboratory of Submarine science and Exploration Technology
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2013

This paper presents an experimental study on the coupled process between pipe vibration and liquefied silt seabed. The results show that once the disturbing force exceeds a certain threshold, the soil rapidly loses its strength and yields a severe deformation. Liquefied soil has obvious dynamic damping effect on pipeline vibration, and the damping effect is related to pipeline burial depth and load amplitude. The natural frequency of the spanning system changed due to soil liquefactions. Meanwhile, this study also indicates that the traditional supporting method may be deficient in preventing pipeline deformation in liquefied seabed. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE).


Hao H.D.,Zhoushan Institute of Calibration and Testing for Qualitative and Technical Supervision | Bai T.Y.,QingDao Geotechnical Investigation and Surveying Research Institute | Liu G.L.,Shandong University of Science and Technology
Advanced Materials Research | Year: 2013

Phase Unwrapping (PU) is the key step in the image processing for Interferometric Synthetic Aperture Radar (InSAR). In the Extended Kalman Filter (EKF) model of PU, due to the state space model is not taken into account the terrain factors, it is often resulted in unwrapping error delivery as the pixel to the next when the state changes rapidly in steep terrain. The observation equation is nonlinear and usually applied in PU through linear processing, requiring the system model and noise statistics known. But in fact the mathematical model or statistical noise is completely or partially unknown; the results have been inevitably lead to the declining of valuation accuracy and filter divergence. If directly applied in phase unwrapping, it is made impossible to retrieve surface deformation. In order to solve this problem and fully consider the terrain effect and model error, an adaptive EKF PU algorithm (AEKFPU) for InSAR is presented. On the one hand, it is achieved local adaptive estimation of image fringe frequency through 2D FFT and Chirp-Z Transform (CZT) joint method, by considering the impact of terrain factors on unwrapping results; On the one hand, the fading factor is calculated by innovation covariance and adaptively adjusted with the error covariance so as to suppress the memory length of the filter, compensating the effect of incomplete information on unwrapping. The experimental results are proved the proposed method is effective, it can be dealt with phase unwrapping and filtering simultaneously, and can be adaptively considered terrain factors in state space model and compensated for model error in observation equation model, ultimately improving the accuracy of phase unwrapping. © (2013) Trans Tech Publications, Switzerland.


Yang J.-J.,CAS Qingdao Institute of Oceanology | Yang J.-J.,Ocean University of China | Sun T.,CAS Qingdao Institute of Oceanology | Sun T.,Ocean University of China | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The cement stabilized soil in natural condition, as well as stabilization in corrosive site, will be influenced by environmental pollution such as acid rain, seawater invasion or industrial pollution, which will lead to deterioration of the structure. Especially in the corrosive site, the strength of soil stabilized by cement will increase, but at the same time, it will decrease due to the deterioration at the beginning of stabilization. The experimental work is performed to study the strength of soil stabilized by cement in the corrosive site which is represented by sea water. Laboratory tests are carried out to measure the strength distribution by means of the micro cone penetration tests. Also, the element analysis tests using the ion chromatography to measure the distribution of Ca 2+ within the specimen are conducted. The effect of seawater pressure on the strength of cement stabilized marine clay is analyzed. Two conditions are prepared. In the first condition, two meters of seawater pressure are applied to the specimen by using vertical pipe filled by seawater, and the other specimen has no pressure applied. It is indicated that the deterioration extends quickly under seawater environment and the deteriorated depth becomes deeper with the increase of pressure. The element analysis shows that the concentration of calcium ions in deteriorated portion is lower than that in non deteriorated portion.


Zhuo H.,Purdue University | Zhou S.,Qingdao Geotechnical Investigation and Surveying Research Institute | Benes B.,Purdue University | Whittinghill D.,Purdue University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

We take advantage of human intuition by encoding facades into a procedural representation. Our user-assisted inverse procedural modeling approach allows users to exploit repetitions and symmetries of facades to create a split grammar representation of the input. Terminal symbols correspond to repeating elements such as windows, window panes, and doors and their distributions are encoded as the production rules. Our participants achieved a compression factor that averaged 57% (min=12%, max=99%) while taking on average 7min (min=1, max=25) to compress an image. The compressed facades do not suffer from occlusion problems present in the input, such as trees or cars. Our second contribution is a novel rendering algorithm that directly displays the compressed facades in their procedural form by interpreting the procedural rules during texture lookup. This algorithm provides considerable memory savings while achieving comparable rendering performance. © Springer International Publishing Switzerland 2015.


Miao S.-J.,University of Science and Technology Beijing | Cai M.-F.,University of Science and Technology Beijing | Ji D.,Qingdao Geotechnical Investigation and Surveying Research Institute | Guo Q.-F.,University of Science and Technology Beijing
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

Uniaxial compression tests, triaxial compression tests and splitting tests were conducted on the granite specimens after the erosion of chemical solutions with different pH values and different flow rates. The responses of strength damage, deformation behavior and mechanical parameters of granite in water and different acidic solutions were compared and analyzed. It shows that uniaxial and triaxial compressive strength, tensile strength, Young's modulus, and cohesion of granite decrease with the reduction of pH value or the increase of flow rate of acidic solutions, while Poisson's ratio is quite in reverse. The internal friction angle of granite after soaking in acidic solutions is smaller than granite in natural dry state, but there is no obvious change in comparison to granite soaking in water. Also, the compressive deformation of granite transforms from brittleness to ductility after soaking in acidic solutions. In conclusion, the pH value and flow rate of natural hydro-chemical environment are two factors that significantly change the strength damage, deformation behavior and mechanical parameters of rock. However, the pH value of acidic solution has a greater impact than the flow rate. © 2016, China Coal Society. All right reserved.


Miao S.-J.,University of Science and Technology Beijing | Cai M.-F.,University of Science and Technology Beijing | Ji D.,Qingdao Geotechnical Investigation and Surveying Research Institute | Guo Q.-F.,University of Science and Technology Beijing | Bai Y.-B.,University of Science and Technology Beijing
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

In the study on granite, the transformation of macroscopic appearances, microscopic structures, defect morphology, elements composition and porosity induced by acidic chemical corrosion are observed with SEM and electron spectrum. The aging features of interaction between granite and chemical solutions are analyzed based on the testing data at different soaking times of mass, elastic wave velocity of specimens and pH value of solutions, and ion chromatography detection results of solutions' chemical constituents and concentration after soaking. According to the testing results of X-ray diffraction for mineral composition and X-ray fluorescence for chemical elements and compound of granite, the chemical reactions between granite and acidic solutions and rock chemical damage process during rock-chemical solutions interaction are discussed combined with chemical kinetics theory. The damage mechanism of chemical corrosion on rock is related to the coupling impacts between properties, components of chemical solution and mineral composition, structures such as particles, pores and cracks of rock, which finally changes the micro ingredients and structure of rock. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.


Ju C.Y.,Ocean University of China | Jia Y.G.,Ocean University of China | Shan H.X.,Ocean University of China | Tang C.W.,Qingdao Geotechnical Investigation and Surveying Research Institute | Ma W.J.,Ocean University of China
Natural Hazards and Earth System Science | Year: 2012

With increasing urbanization, particularly in the coastal regions of developing countries, the development of disaster management schemes is needed as the losses from a single event can destroy decades of development and threaten local populations, buildings and infrastructure. Geo-environmental suitability is often evaluated systematically in order to assess the nature of hazards and their potential damage to human life, land, buildings and other property. A suitability assessment will indicate the priorities for geological and environmental hazard management. This paper presents a geological environment suitability assessment that aims to identify grading in a current seaside urban development and develop practices to aid in the identification of hidden geological and environmental hazards. The Laoshan area in the city of Qingdao was used as a case study because it constitutes a good example of a developing city with geological and environmental threats. Also, urban plans have been drawn up here with insufficient or absent information on losses from potential natural hazards. © Author(s) 2012.


Zhou S.,Qingdao Geotechnical Investigation and Surveying Research Institute | Ma C.,Ocean University of China | Chen G.,Ocean University of China
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2015

A novel procedural modeling and hybrid level-of-detail rendering method is introduced for visually lossless urban scenes visualization. Our user-assisted inverse procedural modeling approach allows the user to exploit repetitions and symmetries of facades to create a split grammar representation of the input, which achieved a 70% compression factor averagely. We extract lines and points from the input models and provide their simplifications encoded in a data structure that allows for a quick and automatic LOD selection. Projected area is used as a LOD selector to combine points, lines, and polygon models that contain procedural textures. Our implementation shows a 10 times speed-up as compared to the ground truth rendered as full geometry, and is about 5 times faster compared to the geometric LOD. The quality of the results is indistinguishable from the original that was confirmed by a user study conducted with 72 subjects and an automated dynamic range independent metric. ©, 2014, Institute of Computing Technology. All right reserved.


Jiang D.,Qingdao Geotechnical Investigation and Surveying Research Institute | Bian L.,Qingdao Geotechnical Investigation and Surveying Research Institute
Advanced Materials Research | Year: 2012

The attrition rate of a TBM cutter connects with the economic benefits of the TBM application and digging efficiency. The main influence factor of the attrition rate of the TBM cutter is rock abrastivity. The rock abrastivity is in contact with the physical and mechanical indexes of rock and rock attributes. The relationship between the rock abrastivity and the physical and mechanical indexes of rock is studied by experiments and mathematical statistics. The experimental samples are collected in the Qingdao subway tunnel and done rock mechanics room experimentation and rock abrastivity experimentation separately in the lab Based on calculation and analyses of the test data. We obtain a mathematic model describing the relationship between rock abrastivity and physical and mechanical indexes of rock and summarize and interpret the correlativity between them. © (2012) Trans Tech Publications.


Liu H.,Ocean University of China | Wang Y.,Ocean University of China | Jiang D.,Qingdao Geotechnical Investigation and Surveying Research Institute | Zheng J.,Ocean University of China
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Many special supporting structures have arisen in deep foundation pits corresponding to different excavation methods, depths and geological conditions. In strata of soil-rock dualistic structure, design and construction experiences are far from adequate in double-row end-suspended piles. The supporting system of Kaiyue deep foundation pit in Qingdao is taken as an engineering case to simulate the excavation process with the finite element software Plaxis. And then, comparative analyses are carried out between analytical results and in-situ monitoring data. The results show that such double-row end-suspended piles has more stiffness and can effectively control the deformation of foundation pit and the displacement of the pile, which mainly concentrates in the depth range of soil strata. The conclusions can serve as a theoretical reference for the optimal design of similar support structures.

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