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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.


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.


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.


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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