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RISS 인기검색어
- 검색키워드
- 저자 : Dingwen Zhang (검색결과 3 건)
- 무료
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- 유료
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Influence of Vehicle Load Mode on the Response of an Asymmetrically-Loaded Deep Excavation
Bo Liu,Dingwen Zhang,Peisheng Xi 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
At present, the research on the influence of vehicle load mode on response of asymmetrically-loaded deep excavation is limited. Based on a deep excavation which is adjacent to the expressway and is subjected to the asymmetric load induced by the weight of embankment and the vehicle load together, this paper presented several vehicle load conversion methods firstly. Then a numerical modelling was performed to simulate the response of deep excavation considering the above methods. Next, a field monitoring of response of deep excavation was performed to verify the simulation results. By comparing the simulated and monitored results, the optimum vehicle load mode was recommended. The results indicate that the vehicle load has a considerable influence on the response of deep excavation. For this study, the equivalent thickness of soil layer method and the improved equivalent thickness of soil layer method are recommended to treat the vehicle load. This paper also analysed the influence factor of the improved equivalent thickness of soil layer method and found the improvement effect of this method rapidly decreases with the increase of retaining wall height. For a very high retaining wall, the improvement effect of this method is limited.
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Jingping Liao,Jianfu Zhang,Pingfa Feng,Dingwen Yu,Zhijun Wu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
Bolted joints have significant influence on the dynamic characteristic of the machine tool assembly. This study proposes a new modeling method using virtual gradient material. On the basis of Hertz contact theory and fractal geometry theory, the relationship between contact stiffness and normal contact load is deduced. The contact pressure distribution at the interface is obtained through finite element contact analysis. An orthogonal material model is introduced to describe the properties of virtual material. The virtual material is divided into several layers, and the elastic modulus and shear modulus in each sub-layer are derived based on Hooke’s Law. Both experimental and theoretical results for a bolted lap structure are obtained. The experimental results are compared with theoretical ones in terms of qualitative comparison of similar mode shapes and quantitative comparison of corresponding natural frequencies. The comparison shows that the theoretical first three-order vibration mode shapes are in good line with the experimental ones. The relative errors of corresponding natural frequencies between the virtual gradient material model and the experiment are less than 9%, which are smaller than those between the traditional virtual uniform material model and the experiment. The proposed virtual gradient material method would be useful to accurately model the bolted joint in CNC machine tools.
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Yuxiao Wang,Guangyin Du,Songyu Liu,Dingwen Zhang 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.10
The resonance probe compaction (RPC) method is an effective technique for particular soils, which mainly includes sandy and loess. However, the application of RPC on contaioning clay interlayer area has never been seen. In this study, a successful case of using the RPB method to treat the clay interlayer foundation is presented in detail. The test results of Huaiyan high-speed railway construction project are introduced. The test is divided into the laboratory test and the field test, mainly including standard penetration test (SPT), cone penetration test (CPT) and seismic wave cone penetration test (SCPT). The test results indicated that the cone resistance of silt and silty sand layers increased to an average of 2.13 times compared with an average of 4.39 MPa before treatment, and the sleeve friction whose initial average is 54.17 kPaincreased to an average of 1.74 times. The existence of the clay interlayer does not affect the consolidation and drainage of the silt layer and the silt sand layer, and after the construction, the excess pore water pressure around the vibration point can be dissipated by more than 90% within 15 minutes. After reinforcement, the standard penetration number of subsoil, increased by about 15% − 95% compared with an average of 19 blows before treatment and the clay particle content of some clay interlayers are reduced to less than 10%. The shear wave velocity of the subsoil in the treatment depth increased by about 15% − 48% compared with 140 m/s before treatment. The RPC method was successful for the coastal phase liquefaction foundations.
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