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Xia X.,Changzhou University | Wang Y.-B.,Changzhou University | Xu H.-D.,Jiangsu Din Da Construction and New Technology Corporation | Xi S.-Y.,Changzhou City Planning and Design Institute | Huang Y.,Changzhou University
Advanced Materials Research | Year: 2014

In recent years, building density in the city is increasing as the promoting of urban modernization. Deep foundation pit excavation and bracing is a topic in geotechnical engineering, including strength and stabilization of soil mechanics, and transmutation and sedimentation of deep foundation, and common effect between soil and shoring structure. The paper based on the design and fabrication of indoor model test device. This paper respectively explored the destroy mechanism of cantilever and anchored sheet pile support structure on the soil pressure under the different loads, and comprehensively carried through cantilever and anchored sheet pile support test under four-grades excavation depth and four-grades load combination, and specially researched the transformation of soil pressure. At the same time, the piles spacing changed among 3cm, 4cm and 5cm. Theoretical results showed that the active earth pressure increased with the increase of load and excavation depth. Model test results showed that the earth pressure behind the piles increased with the increase of excavation depth and the load. The biggest earth pressure was 19.38kPa when loading 40kPa. The changing curves of soil pressure were similar when piles spacing was 3cm and 4cm. Earth pressure after the piles was negative when piles spacing exceeded 4cm, which illustrated that active earth pressure had changed into passive soil pressure. © (2014) Trans Tech Publications, Switzerland. Source


Jiang G.,Nanjing University of Technology | Sun J.,Nanjing University of Technology | Sun J.,Changzhou City Planning and Design Institute | Wang X.-D.,Nanjing University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

When the composite piled foundation reaches the general ultimate bearing capacity status, an increment of the ultimate bearing capacity for natural foundation is induced by "barrier effect" of piles. The analysis of the problem can be simplified for both the sum of the vertical ultimate bearing capacity of foundation and the increment of the ultimate bearing capacity of foundation soil horizontally sliding around piles. Based on the finite element plastic lower bound limit method, the numerical solutions for the vertical ultimate bearing capacity of foundation and the horizontal resistance sliding around piles varying with soil depth are obtained, and the sliding resistance formula is also established. The sliding resistance coefficient ks reduces with the increase of pile spacing. The increment of the ultimate bearing capacity Δfu decreases with the increase of pile spacing. The results indicate that the resistance sliding around piles in the composite piled foundation is being and can not be ignored, and that the ultimate bearing capacity of the composite piled foundation has certain increment, which can be regarded as the security reserve of foundation. Source


Xia X.,Changzhou University | Li L.-L.,Changzhou University | Huang Y.,Changzhou University | Xi S.-Y.,Changzhou City Planning and Design Institute | Xu H.-D.,Jiangsu Ding da and New Technology Corporation
Advanced Materials Research | Year: 2014

Horizontal earthquake acceleration is used for slope risk analysis, and the relationship between the dynamical safety factors and corresponding static safety factors is obtained. The reliability of anchored slope is expressed with the safety factor. The synthesized risk evaluation index, which included the dynamical, statically mechanics and reliability analysis, is established. The main procedure of calculation is provided by a practical project in this paper, and the computed example has shown it is worthy to study the method further. © (2014) Trans Tech Publications, Switzerland. Source


Xia X.,Changzhou University | Li L.-L.,Changzhou University | Huang Y.,Changzhou University | Xu H.-D.,Jiangsu Ding da and New Technology Corporation | Xi S.-Y.,Changzhou City Planning and Design Institute
Advanced Materials Research | Year: 2014

With the development of urban construction, lots of deep foundation pits have come forth continuously. As a new support structure for foundation pit, sheet piles is used in-situ due to its rigidity of pile body, but the mechanism of pile-soil interaction of sheet piles is still unclear. In order to study the bending moment behavior of sheet piles under different excavation situations and surcharge loading, the special device was designed and a series of model tests were conducted to investigate the effects of sheet piles retaining structure. The result indicates that sheet piles bending moment increases with excavations and loadings, but decreases after reaching 30 cm. bending moments are different in different positions, the deformation and moment in middle pile is the largest. Pile bending moment increases when piles spacing increases, for attenuating the pile group effect, pile-soil interaction of sheet piles can be used effectively when piles spacing is 5cm, and the supporting effect is ensured. © (2014) Trans Tech Publications, Switzerland. Source


Zhu L.,Nanjing University of Technology | Kawasaki H.,Obermeyer Planen Beraten | Jiang X.,Changzhou City Planning and Design Institute
Proceedings of the Institution of Civil Engineers: Municipal Engineer | Year: 2015

Rapid urban development and increased car ownership and use in China bring many social and environmental problems. Many Chinese cities are promoting numerous large-scale transport infrastructures and development projects. How to shift the car-oriented development paradigm in the planning and construction of these projects is a challenge for planners and engineers. In the planning of the new town of Changzhou high-speed rail station, the car-free development concept was introduced to create a pedestrian-friendly urban space with easy transportation accessibility, safety and vitality. The planning team studied the car-free development concept and practices, and proposed an adaptive integrated solution for the HSR station project. It consists of four components: mixed-use development, maximum accessibility by public transportation, seamless transport transfer and continuous pedestrian network, which were integrated in the urban design by interfacing with land use, landscape and architecture. The result of the urban design is acknowledged and used as a guiding and control instrument by the city planning bureau for planning and management, serving as a basis for the regulatory planning and further spatial design. © 2015, Thomas Telford Services Ltd. All rights reserved. Source

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