Shanghai Tunnel Engineering and Rail Transit Design and Research Institute

Shanghai, China

Shanghai Tunnel Engineering and Rail Transit Design and Research Institute

Shanghai, China

Time filter

Source Type

Lin Y.-L.,Shanghai University | Zhang M.-X.,Shanghai University | Li X.-X.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

More than one set of anchors with different orientations can be economical solution to completely stability the rock slope. A new computational model for evaluating asismic stability of multi-directional anchored rock slope was presented after taking the supporting effect of rock-bolts, surcharge, seismic force and fissure water pressure into consideration. In this proposed method, not only the factor of safety but also the permanent sliding displacements could be totally calculated. Sever special cases of this expression were found to similar to those reported in the literature. Parametric analysis show that depth of water in tension crack, blocked outflow suture, surcharge have a disadvantage effect on the rock slope stability, and anchorage effect of anchor blots have a advantageous effect on the rock slope stability.


Lin Y.,Shanghai University | Li X.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Based on JRC-JMC failure criterion, a new computational model for evaluating asismic stability of anchored rock slope is presented, incorporating most of the practically occurring destabilizing forces under depth of tension crack, seismic loading conditions, anchorage effect of anchor blots and parameters of the structural plane. The results show that the depth of tension crack has a significant effect on shear strength, and the stability factor of slope remains basically the same. Seismic loading has a disadvantage effect on the rock slope stability against sliding, while the friction angle increases slightly with increase in the seismic loading. It is also shown that the larger the stabilizing force is, the better the slope against sliding will be. With the increase of JRC, JMC and JCS, the safety factor of the slope increases gradually, the greater the JMC is, the more closely to the practical rock.


Lin Y.,Shanghai University | Li X.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
ICCMS 2010 - 2010 International Conference on Computer Modeling and Simulation | Year: 2010

Considering the advantage that 3D geologic model can better reflect the actual geological conditions, a new and practical modeling method (Geologic Model Transforming Method) was presented. The new modeling thought was that the initial surface model formed with geologic model was transformed into the numerical model. In this method, the key techniques of region cutting, surface model reconstruction and auto-meshing were used. All procedures were carried out rapidly by programming. An example of foundation excavation was given to illustrate the application of the method. The implementation of the method resulted in high efficiency and automaticity of modeling. The proposed technology will give some useful references to the continuous researches on this subject. © 2010 IEEE.


Lin Y.L.,Shanghai University | Li X.X.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Rock Mechanics in Civil and Environmental Engineering - Proceedings of the European Rock Mechanics Symposium, EUROCK 2010 | Year: 2010

Conventional calculations of seismic stability and permanent displacement of rock slopes are formulated assuming the soils obeying a linear Mohr-Coulomb yield criterion. However, experimental evidences show that the strength envelopes of almost all geomaterials are nonlinear in nature over a wide range of normal stresses and the influence of the intermediate principal stress is distinct. In this paper, the strength envelope of rock is considered to follow a nonlinear yield criterion and the Unified Strength Theory is introduced. A new methodology for evaluating seismic safety factor and permanent displacement of rock slopes is proposed according to the characteristic of joint rock. In this proposed method, the strength difference and tensile failure can be considered. The influences of angle of bedding slope, inclination of joint, unified strength parameter, tensile depth and seismic load are investigated. The results reveal that, with the increase of intermediate principal stress effect, the safety factor also increases. Obviously, the potential strength of filling materials is sufficiently developed under the guidance of the unified strength theory. © 2010 Taylor & Francis Group.


Yu H.,Shanghai JiaoTong University | Yu H.,Tongji University | Yuan Y.,Tongji University | Qiao Z.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute | And 3 more authors.
Engineering Structures | Year: 2013

Seismic analysis of long tunnels is difficult due to the lack of available computing power. In this paper, a multi-scale method is used to simulate dynamic responses of a long tunnel, which involves the concurrent discretization of the entire domain with both coarse- and fine-scale finite element meshes. The method can not only capture seismic responses along the full tunnel length, but also the detail structural responses of the segment linings and joints. Both material and contact nonlinearities are considered in the multi-scale model. Effects of buried depths, spectrum characteristics of input seismic waves, non-uniform seismic excitation and flexible joints, are thoroughly investigated on seismic responses of the tunnel. Results show: (1) the seismically induced stress of the tunnel is strongly correlated with the depth and is significantly amplified when the depth is one quarter of the incident wavelength; (2) the spectrum characteristics of the given seismic input waves do affect the amplitude and distribution of tunnel ovaling deformations as well as stresses; (3) the non-uniform seismic excitation will greatly aggravate the tunnel responses compared to the uniform excitation, and the effect of spatial distribution of earthquake excitation should be considered in the design of long tunnels; and (4) it is proved that the flexible joints can slightly mitigate the stress concentration, however, especial attention should be paid to the water proof capability of the flexible joints due to the expected additional deformation. Furthermore, stress and deformation response in lining segments and their connecting bolts are investigated and analyzed within the fine-scale model, and the capacity of critical structural components such as bolts and joints is evaluated. © 2012 Elsevier Ltd.


Ye A.,Tongji University | Lu C.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

Treating a group pile foundation as one entity component, an approach of seismic performance analysis for group pile foundations was developed, based on Pushover analysis. A load model and a nonlinear structure model (inelastic pile model and nonlinear boundary condition) for group pile foundations were established, and two specific seismic performance indices, displacement ductility factor and resistance amplification factor, were proposed. The seismic performance analysis of a real group pile foundation was conducted. Based on the nonlinear structural model of the group pile foundation, a series of load cases were developed, the corresponding Pushover curves, the displacement ductility factors, and the resistance amplification factors were calculated. The results indicated that, the axial force and bending moment at the bottom of the pile cap slightly influenced the seismic performance index, while their effects on the lateral force and displacement in yield and ultimate limit state were significant. The displacement ductility factors and resistance amplification factors were quite small under all types of loadings.


Bai Y.,Tongji University | Yang Z.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute | Jiang Z.,Tongji University
Tunnelling and Underground Space Technology | Year: 2013

The Bund Tunnel is 14.27. m in diameter. It is the first application of super diameter earth pressure balanced shield (EPBS) in China. There are many historical buildings along the construction line, and the minimum horizontal distance from the building to the tunnel side varies from 1.7. m to 30. m. Considering the importance of these historical buildings and the complicated construction processes, it is essential to adopt effective protection techniques to ensure safety during the tunnel construction. Three kinds of protection techniques are presented in this paper. Firstly, underground cut-off wall built by bored piles is used to separate the buildings and tunnel when the minimum horizontal distance from the building to the tunnel side is less than 5. m. Secondly, the grouting reinforcement technique is adopted when the minimum clear distance is between 5. m and 10. m. Finally, if the minimum clear distance is larger than 10. m, the optimized construction parameters are selected to reduce the influence induced by the EPBS excavation. The deformations of some typical buildings are monitored. The results of this project will be a useful reference for similar future projects. © 2013 Elsevier Ltd.


Li L.,Tongji University | Geng C.,Tongji University | Tian Y.,Tongji University | Yu Q.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Advanced Materials Research | Year: 2012

With the development of urban transportation, vibration and noise control has attracted increasing attention. Vibration and noise level has become one of the important hallmarks of evaluating the influence of urban transportation to environment. As Tuned Mass Damper (TMD) is an effective means of vibration control, there is more and more emphasis on its research and application. Reasonably designed TMD can reduce vibration and noise caused by wheel/rail impact. So how to take into account the complex factors to improve the design of the TMD is still the important issue. TMD system is an effective structure. In order to study its vibration reduction effect, modal calculation and wheel-set drop simulation have been analyzed in this paper. Through varying the mass of TMD, the performance of vibration attenuation have been verified. The stability and performance of damping property under impact load have been confirmed by wheel-set drop simulation. Comparing the track which uses TMD and the normal one, the effect of TMD system can be testified effectively. © (2012) Trans Tech Publications.


Tan Y.,Tongji University | Li M.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Geotechnical Special Publication | Year: 2011

A 26 m deep metro station was excavated in the soft clays within downtown Shanghai, where exist many commercial and residential buildings. The minimum distance between the excavation and the buildings in the proximity was only 7 m. In order to ensure the safety of the adjacent buildings and associated facilities, building settlements were monitored throughout the construction. Field data indicated that the buildings underwent significant settlements during construction. The magnitudes of building settlements were governed by the distances between buildings and excavation pit, structural types, and foundation types. Based on the analysis of field measurements, some interesting findings about excavation-induced building settlements were obtained. © 2011 ASCE.


Li X.,Tongji University | Tian Z.,Tongji University | Yang Z.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute | Li X.,Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Geotechnical Special Publication | Year: 2014

Estimating soil pressure acting on the tunnel lining accurately is critical to study the mechanical behavior of shield tunnels. The evaluation of internal forces can also contribute to the understanding of the mechanical behavior of segmental lining. This paper presents observed ground pressures and internal forces of the Shanghai Yangtze River Tunnel, which is a large cross-section tunnel with an outer diameter of 15.0 m. The observed ground pressures of the tunnel show obvious sinusoidal fluctuations with the water level of the Yangtze River. The observed ground pressures are closer to the values given by Terzaghi's formula. This means that soil arch still exists although the buried depths are only about 1.5D (D represents the diameter of the tunnel). The observed bending moments are generally greater than theoretical ones, and measured hoop forces are approximately twice as much as theoretical results. This indicates that internal forces calculated by conventional models could only reveal the stress related to the ground load. Observed internal forces could be greater than calculated internal forces because assembling stress is not included. © 2014 American Society of Civil Engineers.

Loading Shanghai Tunnel Engineering and Rail Transit Design and Research Institute collaborators
Loading Shanghai Tunnel Engineering and Rail Transit Design and Research Institute collaborators