Papers by Author: Xiu Guang Song

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Authors: Xiu Yuan Ma, Yong Bai, Xiu Guang Song
Abstract: The earth dam type is widely used in the dam engineering. According to the investigation, the earth dam would suffer problems after running 100 to 200 years in good filling quality. However, in China, for many reasons, it would only need 30 to 40 years when problems occur. This essay study the problems about weak stress of earth dam by the site investigations, theoretic analysis and finite element analysis and put forward the theory of earth dam aging induced by stress weakening.
Authors: Xiao Ming Yi, Song Gen Wang, Xiu Guang Song, Hong Bo Zhang
Abstract: The water content in the subgrade changes easily as the variation of the environment water, which causes the strength attenuation of the subgrade. It is harmful to the stability of subgrade slope. Strength decay pattern of silt soil in yellow river alluvial plain is studied through the laboratory test. And then the finite element software GEO-SLOPE is used to calculate coefficient of stability under different conditions. Results show strength indexes of silt soil are maximum in the optimal water content, and the change of the water content would cause strength attenuation. The stability of subgrade slope decreases as the strength degradation, while the evolution is different, which is semi-parabolic in the lower subgrade but rectilinear in the higher subgrade. Seismic load leads to stress concentrate at the slope, combined with the strength attenuation the landslide is easily to take place.
Authors: Xiu Guang Song, Kai Yao, Zhi Gang Dou, Yang Yang
Abstract: In order to understand the dynamic stress diffusion rule of the waste iron slag (sand soil) during dynamic consolidation, we conducted a large field test. The propagation and attenuation of dynamic stress in each ramming strike was recorded through the resistance strain gauge. It was shown that the dynamic stress caused by dynamic consolidation is pretty obvious. The dynamic stress dissipates extremely fast during the dynamic consolidation, the time is only 0.5s after plus the aftermath. The soil dynamic stress has heart-shaped distribution during the compaction. The dynamic stress value increases with the tamping hit number, but it keeps stable after about the third hits.
Authors: Si Feng Zhang, Yan Mei Li, Xiu Guang Song, Jian Zhou, Jian Cui
Abstract: Based on the theory of particle flow code, the micro-numerical analysis model is established to study the anchorage performance of geotechnical prestressed anchorage structures. According to the numerical model tests, the development regularity of stress and displacement of surrounding soil around bar body under the effect of uplift loading is analyzed, and the interaction characters between anchor bolt and surrounding soil are also deeply studied. Conclusions can be drawn as follows: with the function of tensile load, two area of stress concentration form within the interior bond section of prestressed anchorage structure, and the soil porosity also changes accordingly. The interface shear stress peak point shift inward gradually with the increase of time-stepping, furthmore, the peak stress also enlarges gradually. According to the deformation mode, the surrounding soil can be divided into three zones. The radial displacement of soil between anchors is weakened because of the effects of group anchors, but the axial displacement is strengthened, which nominally is similar to the “single anchor character”. The research findings have a certain reference value for the study of anchorage mechanism.
Authors: Zhi Dong Zhou, Hong Bo Zhang, Xiu Guang Song, Hong Ya Yue
Abstract: For analyzing and evaluating the deformation features of channel goaf foundation and its effect on superstructure, according to the foundation reinforcement engineering of Ji-Liang Channel Check Gate, the comparative analysis on the differential settlement between the unfavorable foundation and natural foundation was performed by numerical simulation with FLAC3D. The computer results showed that the present foundation had obvious effect on the stability and security of the superstructure, so the engineering treatment are needed. Based on technical-economic comprehensive analysis among three treatment methods for strengthening the channel golf foundation with different kinds of filling, the reasonable method is put forward in this paper. By comparing mechanical characteristic of flashboard in channel goaf before and after strengthening, we confirmed the foundation stability of channel goaf and the security of the ground building which can satisfy the long term usage requirements.
Authors: Si Feng Zhang, Xue Feng Chen, Lin Li, Xiu Guang Song
Abstract: Based on the summary of research methods and research results of durability of corroded steel bar and its structure, the factors that affect durability of corroded steel bar were summarized and the corrosion morphology and regularity of steel bar was analyzed as well as the impact on the mechanical properties and fatigue life of steel bar. The weakening of fatigue life of steel bar because of corrosion was illustrated through the typical corroded steel bar fatigue S-N curve. Finally, the study direction on durability of corroded steel bar under fatigue load was proposed according to the research progress and the insufficiency at present.
Authors: Xiu Guang Song, Yang Yang, Qing Dong Wu, Zhi Dong Zhou
Abstract: The effective reinforcement depth is one of the most important parameters of dynamic compaction method design and construction, so far it is still lack of in-depth theoretical study. In this paper, combined with the field test, FLAC3D was used to do the numerical simulation of dynamic compaction reinforcement to cohesionless soil. By the simulation, this paper analyzed the factors which may influence the effective reinforcement depth, such as the hammers weight, drop distance, base area, and the soil parameters. The orthogonal design method was used to analyze the soil parameters sensitivity to the effective reinforcement depth. Combined with the results of numerical analysis and the traditional empirical formulae, the effective reinforcement depth calculation formula was established for cohesionless soil. Engineering verification shows that, the results estimated by the formula is reliable, and can provide certain reference for the future engineering.
Authors: Hong Bo Zhang, Li Zhi Zheng, Xiu Guang Song, Jun Ping Xu
Abstract: In order to make up for defects, including big gravity stress, large mansory and higher ground stress, in traditional gravity retaining wall, a new type of gravity retainwall combining grouting anchor is developed to support higher embankment. By installing soil pressure cells and anchor dynamometric cells, the vertical pressure on the bottom, lateral pressure on the retaining wall and the axial force of grouting anchor are analyzed during filling of embankment.
Authors: Xiu Guang Song, Xiu Yuan Ma, Jin Zhang Liu
Abstract: Based on the conception of dynamic shape function, a finite dynamic element method (DEM) is developed for the computation of dynamic consolidation. Formulae of the DEM are also derived. This method overcomes the shortcomings of conventional finite element methods, i.e., the vibration characteristics of the soil to be consolidated cannot be considered. Therefore, it practically reflects the dynamic characteristics of consolidation. The programs for the DEM are also written. Results of practical calculation show that the method is correct and feasible.
Authors: Ying Yong Li, Li Zhi Zheng, Hong Bo Zhang, Xiu Guang Song, Zhi Chao Xue
Abstract: In order to ensure the security of gravity retaining wall in the high fill subgrade, the design of gravity retaining wall with anchors is proposed,the characteristic of the new wall is that comment anchors are added to the traditional gravity retaining wall,by friction anchors provide lateral pull to the wall so the stability of the new wall is improved. Because of the constraints of anchors, the lateral free deformation is influenced and the soil pressure distribution is very complicated, field tests showed that soil pressure distribution is nonlinear and pressure concentrate in anchoring position. In order to reveal the supporting mechanism of retaining wall and propose the soil pressure formula, the model test of anchor retaining wall is made and numerical simulation is done. The results show that soil pressure appears incresent above the anchor and decreasing below the anchor, the soil pressre also grew larger away from the anchor proximal in the horizontal direction.
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