Zhang Q.,Dalian University of Technology |
Zhang J.-F.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Wang W.-Y.,Dalian University of Technology |
Song X.-Q.,Dalian University of Technology |
Guo Z.-J.,Dalian University of Technology
Dalian Haishi Daxue Xuebao/Journal of Dalian Maritime University | Year: 2017
In order to solve the problem of insufficient consideration of process mechanism and temporal dynamic in the study of port ecological carrying capacity, a comprehensive evaluation method of ecological carrying capacity was proposed, and the dynamic evaluation and prediction of evolutionary trend on port ecological capacity was realized. Firstly, a system dynamics model for port ecological carrying capacity was built from the aspects of social economy, resources and environment by using the theory of system dynamics. Secondly, the comprehensive evaluation index system of port ecological carrying capacity was proposed by introducing the comprehensive evaluation method of ecological carrying capacity, and a multiple evaluation model for port ecological carrying capacity was set up. On this basis, taking a port in northern China as an example, the status analysis and parameter sensitivity analysis of ecological carrying states were conducted to identify the key impacting factors by using the multiple evaluation model. Then, the natural development plan and the comprehensive control plan were set up to simulate and evaluate dynamically the evolution trend of port ecological carrying states from 2015 to 2030. Results indicate that the comprehensive control plan can effectively solve the ecological overload problem in the port area and improve significantly the level of port ecological carrying states. The result can provide a theoretical basis for ecological port construction and restoration. © 2017, Editorial Office of Journal of Dalian Maritime University. All right reserved.
Zong Z.-H.,Nanjing Southeast University |
Yang Z.-G.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Xia Y.-F.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Yuan W.-W.,Jiangsu Provincial Communications Planning and Design Institute Co.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2016
To analyze vehicle load for bridge under congested running status, vehicle load model for Xinyihe River Bridge under the congested running status was conducted, in which the correlation between gross vehicle weight (GVW) and wheelbase parameter was considered based on the data measured by weigh-in-motion system. Based on expectation maximization (EM) algorithm, the marginal distribution of GVW and weight intensity was fitted firstly. Copula theory was used to select model, and the random traffic flow under congested running status was constructed using the random number generation method. Furthermore, based on the equilibrium renewal process theory and the bridge influence line, the maximum value distribution functions of vehicle load effects at different estimation reference periods were derived, and the vehicle load effects of Xinyihe River Bridge under congested running status were analyzed. The results show that considering the vehicle parameter correlation, the vehicle load models under congested running status are 10% larger than those without considering the correlation of vehicle parameter. For Xinyihe River Bridge, congested running status is one of the dangerous conditions, in which the load rating on the left lane reaches 1.8 times of the highway level I loading, and the load rating on the right lane reaches 2.1 times of the highway level I loading. The study can provide a reference for bridge maintenance management and congestion emergency treatment. © 2016, Editorial Department of China Journal of Highway and Transport. All right reserved.
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.
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.
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.
Fan F.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Fan F.,Ocean University of China |
Zhu Z.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Liang B.,Ocean University of China
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015
The assessment method of wave energy resources was studied based on the wave climate of Shandong peninsula. Firstly, 16 year wave climate of Shandong peninsula was simulated by SWAN model, and then the buoy data were used to compare with the model, and the result show that the model fits well with the buoy data. The wave energy resources of Shandong peninsula were computed with two methods. Lastly, two sections and ten points were chosen to study the wave energy with those methods. The results show that the wave energy calculated by Kim's simplified method and general simplified method are larger than the exact data which was calculated by SWAN model. As the water depth increases, the deviation and the correlation to exact solution enlarge. In general, the general simplified method is better than Kim's simplified method. ©, 2015, Science Press. All right reserved.
Shen L.-W.,Nanjing University of Technology |
Zhuang H.-Y.,Nanjing University of Technology |
Chen L.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Li H.,Jiangsu Provincial Communications Planning and Design Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2014
A cumulative deformation forecast model can predict long-term settlement of sand under the train-induced vibration load and has a great practical value in engineering practice. Based on cyclic triaxial experiment on the remolded samples of Nanjing fine sand using GDS (geotechnical digital systems) dynamic hollow cylinder torsional apparatus, the article analyzes sand characteristics of accumuted deformation, summarizes current studies on a cumulative deformation model formula at home and abroad, and compares the different formulae results with the experiment data; finally finds the most suitable model formula for Nanjing fine sand. Through comparison and analysis, the formula of logarithm model, of which the parameters are determined, has been found having a good application effect on a cumulated deformation prediction of Nanjing fine sand. ©, 2014, Academia Sinica. All right reserved.
Jian Z.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Jian Z.,Aquatic Transportation Center |
Zhai J.-F.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Zhai J.-F.,Aquatic Transportation Center |
And 2 more authors.
Applied Mechanics and Materials | Year: 2014
Bamboo pile-mattress is a system that combines both bamboo piles and bamboo mattress for reinforcement embankment on soft clay. This system utilizes bamboo piles to act as friction piles and bamboo mattress to distribute embankment load uniformly, to alter critical failure surface, and to provide upward buoyancy pressure. The system has been utilized in several projects for coastal embankment on soft clay in Indonesia and has been proven reliable and durable.f. To investigate the performance of the system, instrumented full scale test was conducted at near shore area at Tambak Oso, Surabaya. At the area, very soft to medium clay layer was found until 30 m below ground surface. Stability analysis and settlement prediction was performed using analytical and numerical methods. The numerical method analysis was conducted using finite element method utilizing a commercial program package. Trial embankment was performed in several fill stages followed by observation of embankment stability and ground settlement. Field observation indicated that embankment using bamboo pile-mattress system showed adequate stability against slope failure and bearing capacity failure and actual settlement was also close to predicted settlement. Hence, bamboo pile-mattress system is proven to be reliable as ground reinforcement and to distribute settlement more uniformly and the calculation method was fit with actual condition. © (2014) Trans Tech Publications, Switzerland.
Chen J.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Zhang J.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Zhou Y.-P.,Jiangsu Provincial Communications Planning and Design Institute Co. |
Xu L.-Y.,Jiangsu Provincial Communications Planning and Design Institute Co.
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016
As a new revetment technique, ecological revetment has become a trend of waterway regulation. On the basis of ecological revetment classification, the schemes of LianShen waterway regulation project are analyzed according to local natural conditions, and then used for ecological revetment. It may serve as a reference for other waterway regulation projects. © 2016 Taylor & Francis Group, London.
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.