Papers by Keyword: Model Test

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Authors: Fei Wang, Xu Li Liang, Gang Li Hao
Abstract: We conducted the model test of unloading rock mass under compression-shear stress .Based on analysis and fitting to test data, we proposed the unloading rock mass three-dimension constitutive model.
Authors: Wen Lu Wang, Shu Jun Cui, Da Jun Zhao, Lei Wang
Abstract: How to determine the foundation bearing capacity of high-stacked culverts in highway construction becomes a problem that must be taken seriously. Combining with the stress characteristics of the foundation soil, the soil force was analyzed for finding the improved effect on the separated foundation bearing capacity of lateral fill. Establishing the calculation model and algorithm, the general formulation of separated foundation bearing capacity considering lateral fill was deduced. Then under direction of similarity theory, six model experiments were designed to simulate the silt clay foundation deformation in whole loading process. The pressure-settlement curves were drew and the foundation bearing capacity under lateral fill height of 0 m, 4 m, 6 m, 8 m, 10 m, 12 m were measured. Test results showed that with the fill height increasing the bearing capacity increased significantly, it had been reached 815 kPa when the fill height was 10 m. But the growth was nonlinear, it first increased from 18.40% to 20.37% and then reduced to 8.59%. At last the bearing capacity reached 885 kPa while fill height exceeded 12 m. Meanwhile the errors between the calculated results and measured by model test were almost less than 10% so the algorithm was feasible. The conclusion is that the lateral fill is advantageous for improve the foundation bearing capacity and reduce project cost significantly when the settlement of the culverts foundation satisfied the design request, with the lateral fill increasing, the rate of the improvement first increases and then decreases, at last it tends to 885 KPa when fill height exceeded 12 m.
Authors: Xiao Fang Liu, Dang Wei Wang, He Qing Huang
Abstract: Several optimized designs of trajectory bucket pattern for spillway tunnel outlet are compared in the experiment of Sanliping hydropower project integer physical model and the results show that energy dissipation of outflow nappe is sufficient after optimization and no scouring occur near the riverbank either at high water level or at low water level, which ensure the security of spillway structure. And these experimental results can provide a scientific foundation for the design of Sanliping project.
Authors: Ming Hui Yang, Bi Feng Ou, Shang Wu Lu
Abstract: This study presents an improved finite beam element method developed to calculate lateral displacement of pile subjected to eccentric and inclined loads. The relationships between the moment and shear to the lateral displacements of pile are derived from the mechanical deferential equation of the pile by taking into account the P-Δ effect of the pile due to geometric nonlinearity, and the stiffness of the pile element discretized into the finite beam elements is obtained, followed by solving, lateral displacement of pile is deduced by the improved finite beam element equations. By comparing to results of a model test on piles under eccentric and inclined loads, it is shown that the improved finite beam element method accurately predicts the pile’s lateral displacements.
Authors: Xiong Xia, Lin Lin Li, Yi Huang, Han Dong Xu, Sai Ying Xi
Abstract: 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.
Authors: Zhao Jian Luan, Qiang Xin, Yan Min Jia
Abstract: In this paper, the author simulates geological conditions of permafrost areas, establi-shes CFG group piles indoor model, observes the pile and frozen soil temperature field, then compares the calculated results of the group piles and frozen soil temperatures under concrete hydration heat effect by using ABAQUS with the measured temperature data, thus determines the applicability of ABAQUS for analysis of CFG group piles temperature in permafrost areas, in order to analyze temperature distribution regularities of group piles and frozen soil under concrete hydration heat effect, thermal perturbation range of CFG group piles in permafrost areas, and effects of different concrete molding temperature on model temperature field.
Authors: Hua Mao Zheng, Zhao Ran Xiao, Huai Chen
Abstract: Static pressed pile in the sand is a complex process. In this paper, strain of each point in the process of model pile sinking was measured by lab model test, the relationship of stress and strain of piles and the corresponding stress coefficient are made by semi-numerical and semi-analytical mathematical methods, the distribution of confining pressure and friction are built, and the calculation of sinking pile resistance in the process of construction is given out. The result provides the directive reference for the design of static pressure pile.
Authors: Hua Gu, Gen Hua Yan
Abstract: It is generally existed that the vibration problem of hydraulic gate structure during water conservancy project, whose vibratory magnitude is closely related to inherent feature of gate structure and spectrum signature of hydrodynamic loads. In this project, through contrastive analysis of modal test procedure of multi-support excitation and single-point response as well as finite element computational analysis, test model and finite element model of some hydraulic sector gate had been built to indicate the results of modal test were basically close with that of finite element model, the changing frequency being the same. Both of them could truly reflect the dynamic characteristics of gate, which proved it effective that the methods for researching on vibration modes of hydraulic gate adopted and provided important basis for further dynamics research and design optimization.
Authors: Rong Da Li, Hong Run Yu
Abstract: The stress distributions of the related anchorage zones are complicated under the large tonnage anchorage device. The safety and the crack resistance of the anchorage zone which exists due to the usage of are the critical part of the structural design. Do research on the general distribution regularity of stress of anchor-region by using ANSYS and gives the reason of the cracks occurred on web-plate.
Authors: Aminaton Marto, Mohsen Oghabi, Nor Zurairahetty Mohd Yunus
Abstract: Bearing capacity and settlement are two important parameters in geotechnical engineering. The bearing capacity of circular foundations on sandy soils is important to geotechnical practicing engineers. Design of foundations includes soil parameters and bearing capacity of foundation. This paper presents the results of laboratory experimental model tests of circular footings supported on sand deposit under static load. The finite element software Abaqus is used to compare the results. The effects of the relative density of the sand (30%, 50%, and 70%) and the diameter of circular footing (75 mm and 100 mm) are investigated. It can be concluded that the experimental test results fit quite well with the results of numerical method.
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