Guangzhou Municipal Engineering Group

Guangzhou, China

Guangzhou Municipal Engineering Group

Guangzhou, China
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Liu T.,Guangzhou Municipal Engineering Group | Liu T.,CAS Wuhan Institute of Rock and Soil Mechanics | Ge X.,CAS Wuhan Institute of Rock and Soil Mechanics | An G.,Guangzhou Municipal Engineering Group
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

High liquid limit and low liquid limit clay specimens from Pearl River delta are used for cyclic triaxial tests under uniaxial cyclic loading, respectively, to simulate traffic loads. The emphasis is put on the development of axial strain and pore pressure of saturated soft clay. The influence of axial stress, confining stress and plasticity index are taken into account. The results of tests indicate that: (1) For the same soil, there are different critical cyclic stresses of saturated soft clay under different confining pressures. Critical cyclic stress ratio can be introduced under uniaxial cyclic loading. The critical cyclic stress can be normalized with undrained shear strength of saturated soft clay under different confining pressures. (2) Whether the cyclic stress is greater than the critical cyclic stress, variations of axis strain and pore pressure with number of cycles show two kind of rules. (3) The critical cyclic stress ratio is related to the plasticity index of saturated soft clay. The greater the plasticity index is, the smaller the critical cyclic stress ratio is. (4) When the cyclic stress is less than the critical cyclic stress, with the same loading condition, the axis strain and the pore pressure of samples with greater plasticity index develop faster than those of samples with smaller plastic index. (5) When the cyclic stress is greater than the critical cyclic stress, the sample of saturated soft clay fails rapidly. When the sample fails, the pore pressure can not achieve the value of confining pressure, only 60%-70% of the confining pressure. These conclusions are helpful for analyzing the settlement of saturated soft foundation under traffic loading.


Ding J.,Chang'an 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.


Ding J.,Chang'an 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.


Ding J.,Chang'an 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.


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.


Zhang H.,Central South University | Zhang H.,Guangzhou Municipal Engineering Group | Zhang G.,Central South University | An G.,Guangzhou Municipal Engineering Group | Liu T.,Guangzhou Municipal Engineering Group
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2014

The 3D Goodman element is used to simulate segments' cracks in one section of shield tunnel in Guangzhou. Mechanical and deformation characteristics of segment structure responded to varied depth of cracks is analyzed in this paper. Meanwhile, research on coefficient of lateral earth pressure, soil coefficient and ground water level on mechanical and deformation characteristics is carried out. The research result shows that along with the increase of cracks' depth, the tensile stress, pressure stress reach the maximum value while the increment is not too much. However, when the depth equals to the thickness of segment, the reinforcements' tensile stress has increase sharply, even exceeded the allowable value. Moreover, the maximum number of tensile stress, horizontal and vertical convergent value of shield tunnel segment with cracks increase with the reduction of the coefficient of lateral earth pressure and soil coefficient, and increase with the increase of ground water level as well. Specific repair measure has been taken to segments' cracks in this section of shield tunnel based on the conclusions. In general, this section of shield tunnel is stable and safe now, and there is no longer new cracks appeared.


An G.-F.,Guangzhou Municipal Engineering Group | Zhang H.-B.,Guangzhou Municipal Engineering Group | Liu T.-J.,Guangzhou Municipal Engineering Group
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

The method of soft soil subgrade reinforcement with chemical churning pile is used more and more in projects of subgrade treatment. At present, the researches about chemical churning pile usually focus on improvement in construction techniques or bearing characteristics of single pile. But research about bearing characteristics of chemical churning pile groups is not much. Based on MIDAS-GTS three-dimensional finite element analysis, the influence of design parameters on bearing characteristics of chemical churning pile groups is studied. These design parameters of chemical churning pile include layout, elastic modulus, length, diameter of piles, and distance between piles, the parameters of interface between piles and soil. The results show that the vertical settlement of soil within the range between surface and pile bottom is reduced in soft soil subgrade reinforced by chemical churning piles; but the method has little effect on the vertical settlement of soil under pile bottom. Larger pile diameter and higher material strength can improve the bearing capacity of composite subgrade. But different layouts of chemical churning piles and whether to set up Goodman interface element have little influence on bearing capacity of composite subgrade.


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.


Liu T.,Guangzhou Municipal Engineering Group | An G.,Guangzhou Municipal Engineering Group | Liang H.,Guangzhou Municipal Engineering Group
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016

This paper is based on a culvert construction method on the highway, above metro tunnels, and the loading and geological condition that sets up a three-dimensional numerical analysis modeled to analyze the influence of the culvert excavation construction. Studies show when it was digging or backfilling, the largest horizontal and vertical displacement appeared on the metro tunnel. The total maximum displacement was 1.84 mm, which was less than the subway protection requirements of the total displacement control values (8 mm). At the same time, the maximum displacement of tunnel rail was 1.37 mm, which was less than the value of the early warning system for metro rail deformation and control values (4 mm) that it would not affect the normal operation of the subway. That is to say, the construction measures, therefore, will not endanger the bottom of the box culvert construction of metro tunnel structure safety, the engineering experience can be provided as a reference for similar projects. © 2016 Taylor & Francis Group, London.


Liu T.,Guangzhou Municipal Engineering Group | Liu T.,CAS Institute of Mechanics | An G.,Guangzhou Municipal Engineering Group | Zhang H.,Guangzhou Municipal Engineering Group
Advanced Materials Research | Year: 2011

Simulating traffic loading, the high liquid limit clay specimens and the low liquid limit clay specimens of the Pearl River delta are engaged in cyclic triaxial tests under one-way cyclic loading respectively. The influence of axial stress, confining stress and plasticity index are taken into account. A critical dynamic stress ratio of saturated soft clay under one-way cyclic loading and the variations of axis strain and pore pressure with number of cycles were obtained. The conclusions are helpful to compute the settlement of saturated soft foundation under traffic loading after work.

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