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Ding J.,Changan University | Xian Y.,China Merchants Property Development Co. | Liu T.,Guangzhou Municipal Engineering Group
Advanced Materials Research | Year: 2012

With the development of urban construction, urban transit network has been gradually improved, but subway tunnel under its normal operation is inevitably affected by underground engineering activities such as foundation pit engineering. Based on the deep excavation near the effects of tunnel, the research content of 3d finite element analysis, from the qualitative research based on different situations of foundation excavation, is near to optimize the design and construction to provide the beneficial reference. Source


Ding J.,Changan University | Xian Y.,China Merchants Property Development Co. | Liu T.,Guangzhou Municipal Engineering Group
Advanced Materials Research | Year: 2012

The deep excavation of the foundation pit adjacent to the metro tunnel will change the stress state of the neighboring soil. And the deformation of tunnel will be induced which will cause impair to daily operation and the safety of metro tunnel. According to the practice of deep excavation neighboring the metro tunnel in Guangzhou, the main influence factors of deformation and stress of tunnel will be analyzed based on exaction conditions and field data. The conclusions will be benefit to similar projects. © (2012) Trans Tech Publications, Switzerland. Source


Zhang G.-X.,Central South University | Zhang H.-B.,Central South University | An G.-F.,Guangzhou Municipal Engineering Group
Journal of Railway Engineering Society | Year: 2014

Research purposes: At present, the analysis methods about seismic passive earth pressure and its distribution have several defects, including unreasonable distribution rule and position, complex derivation, harsh application conditions and so on. The seismic passive earth pressure problem is translated into non-seismic passive earth pressure problem in this paper by using the transform method with rotating calculation model of retaining wall. This method has large reference value to simplify the calculation process of seismic passive earth pressure and its distribution. Research conclusions: Based on the non-seismic passive earth pressure formulations with horizontal slices analysis method, the analytical formulas of seismic passive earth pressure intensity distribution, resultant force of earth pressure and its point position are obtained directly, and the explicit solution of critical rupture angle is got by graphic method. The influencing factors including horizontal and vertical seismic accelerations, different angle of wall back, cohesion and external friction angle between filler and back of retaining wall, equispaced overloading are considered. The formulas can be used for seismic passive earth pressure calculations of cohesive soil with common border condition. The deducing process of seismic passive earth pressure formulations is simplified and unified greatly by using the method in this paper. The seismic passive earth pressure theory is perfected much more. The research results can be applied to do fast computation about seismic passive earth pressure of retaining wall. Source


Ding J.,Changan University | Xian Y.,China Merchants Property Development Co. | Liu T.,Guangzhou Municipal Engineering Group
Applied Mechanics and Materials | Year: 2011

Combined with one foundation pit engineering in Guangzhou, the method was adopted in this paper, by which the in-situ test and finite element analysis were integrated. According to situation of study and demand of engineering, the study in composite soil nailing walls system was focused on working mechanism. The law of soil-nailing support technology for deep excavation was pointed out and summarized to provide reference to similar projects. © (2011) Trans Tech Publications. Source


Zhang H.,Central South University | An G.,Guangzhou Municipal Engineering Group | Liu T.,Guangzhou Municipal Engineering Group | Zhang G.,Central South University
Electronic Journal of Geotechnical Engineering | Year: 2014

As a kind of temporary water defending structure in bridge construction, steel sheet pile cofferdam is typically constructed by the sequential construction method, which is to conduct the inner brace installation after punching steel sheet pile and pouring out the water, but difficult to achieve in deep river. In Guangzhou Jiaomen Bridge Construction, a new construction method, termed converse construction method, was used due to the complicated geological condition and deep water depth. Employing the new method, the inner brace installation was accomplished before punching steel sheet pile and pouring out the water. The main focus of this paper is to investigate the mechanical and displacemental properties of the new cofferdam structure in construction process. Using numerical analysis, the behaviors of the different connections between inner brace and piles before and after drawing out water were simulated with point springs and rigid joints. The results show, in the construction process of the new cofferdam in Jiaomen Bridge Construction in Guangzhou, the horizontal displacement peaked at 82mm, which was 132 mm smaller than normal cofferdam. The maximum axial force of inner brace during construction process is 742.9kN for the opposite brace and 2319.8kN for the angle brace, which is much smaller than the maximum allowable value, 4593kN for opposite brace and 3892kN for angle brace. In comparison with the sequential construction method, the converse construction method is more effective on controlling the horizontal displacement. © 2014 ejge. Source

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