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Wang H.,Dalian University of Technology | Qin S.,Dalian University | Tan Y.,Dalian University of Technology | Zhang Z.,Dalian University of Technology | Du G.,Jiangsu Provincial Communications Planning and Design Institute Co.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2010

The self-anchored cable-stayed suspension bridge is a new type bridge structure. In order to check the design of structure and study on the structure characteristics, a model of Dalian Gulf Bridge is made, which similarity scale is 1/100. The results of the experiments are consistent with those of theoretical analysis. The static force performance of self-anchored cable-stayed suspension bridge can be analyzed by finite displacement theory. The conclusions can offer the helpful basis for research and design on self-anchored cable-stayed suspension. Source

Liu H.-L.,Hohai University | Jin H.,Hohai University | Ding X.-M.,Hohai University | Li J.,Jiangsu Provincial Communications Planning and Design Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

Squeezing effects of different piles are hot issues and important problems in engineering design and constructions. Based on the Fourth Yangtze River Bridge s north-line soft soil treatment engineering at Nanjing, the squeezing effects of X-section cast-in-place concrete pile (referred to as XCC pile) were studied. The influence of pile construction on pore water pressure changes, earth pressure and lateral displacement are observed by pre-laying piezometers, earth pressure cells and inclinometers, respectively. Instruments are embedded at different directions and different depths. Through analyzing the data from field tests, the squeezing effects of XCC pile are obtained. The results show that the maximum horizontal displacement occurs at the top of the piles; and these displacements can be neglected when the distance exceeds five times of equivalent pile diameter. It is also shown that crowded soil pressure and pore-water pressure decreased with the increasing of center distance; besides, pressure of sharp corner is larger than that of concavity. The data from field tests provide other engineers with reliable evidences. Source

Ding G.-Q.,Jiangsu Provincial Communications Planning and Design Institute Co. | Jiang L.-H.,Hohai University | Zhang J.-Y.,Changsha Municipal Office for Bulk Cement
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2012

The influences of variety and content of bentonite on the properties of cement pastes was studied. The results show that the compressive strength of sodium-based bentonite was higher than that of calcium-based bentonite. The compressive strength and the Ca(OH) 2 content of the hardened cement pastes reduce with the increasing of the content of bentonite. The variety and content of bentonite also have influence on the pore distribution and SEM figure of the hardened cement pastes. Source

Li J.,Jiangsu Provincial Communications Planning and Design Institute Co.
Applied Mechanics and Materials | Year: 2012

In geotechnical engineering, assessment of the depth location of stratigraphic interfaces and the depth and thickness of thin layers can be critical in the design process. For example, stratigraphic interfaces can promote anisotropic soil strength response and potentially provide preferential slip planes that create slope instability. Similarly, the presence of thin, high permeability layers can alter groundwater flow regimes and rates of consolidation, which can hinder or accelerate methods of ground improvement. The piezocone penetration test (PCPT or CPTU) is an extension of the cone penetration test (CPT) and is able to measure cone tip resistance, sleeve friction and generated pore-water pressures simultaneously. The piezocone's functionality is through the measured excess pore pressure profile, which reflects changes in the drainage conditions, and therefore soil conditions. In this paper the relationship between CPTU parameters and soil types and strata is analyzed, and the structure of a general regression neural network (GRNN) is designed, and the application program is programmed with MATLAB language. The results, identifying soil strata by CPTU, have confirmed that GRNN can be used to carry out the automatically identifying soil strata. © (2012) Trans Tech Publications, Switzerland. Source

He L.-D.,Hohai University | Jiang Y.,Jiangsu Provincial Communications Planning and Design Institute Co. | Yin Z.-J.,Jiangsu Provincial Communications Planning and Design Institute Co. | Zhou B.,Hohai University | Tang H.,Hohai University
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2012

In order to study the characteristics of inland ship flow, the correlation among breaking distance, ship length and speed was analyzed, the empirical equation of breaking distance was given based on ship breaking mechanism. The impact of operator experience on actual breaking distance was considered, and the following distance model of inland ship was established. Combined with instance analysis including single motorship, pushing fleet and towing fleet in Jiangsu, the parameters of following distance model were determined by analyzing the empirical value of major axis for inland ship domain and the computing value of piecewise linear model of 100 t single motorship. Analysis result shows that the breaking distances of 3 ship categories are related to the lengths of single ship, fleet and the longest barge, and the calculated length coefficients are 5.98, 2.73 and 17.41 respectively. The breaking distances of single motorship and pushing fleet are in direct proportion to the square of ship speed, the breaking distance of towing fleet is in direct proportion to the 0.85th power of ship speed. The breaking operation coefficient and index of ship operator are determined as 0.78 and 2.5 respectively. Source

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