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Ye C.-L.,Shijiazhuang University | He B.-G.,South China University of Technology | Gao R.,China Railway Eryuan Group Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2013

Seismic response of large section tunnel with different classification of surrounding rock in tectonic geo-stress has been a key scientific problem on. By taking on Youzhu Mountain tunnel on Guiyang-Guangzhou high-speed passenger rail line, three-dimensional numerical simulation was carried out to investigate the dynamic response of lining. The results suggest that the maximum horizontal velocity is three times the vertical velocity under the vertical and horizontal seismic loads. The maximum horizontal acceleration is different from that of the vertical. The amplification is in the range between 2.5 and 5.3. With the rock strength reducal, rock mass is prone to damages and the vibration velocity is less. With time, the deformation is more and confinement effect of surrounding rock weakens. In teams of preferable rock mass, the lining of the tunnel is subjected to damaging vibration. Consequently, high grade concrete should be performed. For bad rock mass, the lining bears shearing deformation damage. The reinforcement ratio of lining should be improved to avoid shearing and tensile failure.

Luo Y.-N.,China Railway Eryuan Group Co. | Wei Y.-X.,China Railway Eryuan Group Co. | Ding Z.-F.,China Railway Eryuan Group Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: (1)This paper analyzes the main influence factors on the stability of cutting retaining wall by using single-factor sensitivity analysis method in the risk management theory, gives the detailed introduction on the sensitivity analysis steps to find out the main influence factors on the function target, sort the risk factors according to their influence degree of risk factors and presents the measures and methods for prevention of the risk event in the design and construction by analyzing the change regulation of the stability on the sensitive degree and the influence factors. Research conclusions: The angle of internal friction and soil severe are the key influence factors on the stability of retaining wall. (2) These two influence factors will change if the drainage system is poor, so the design and construction of drainage system are very important for the retaining wall. (3)The earth pressure of retaining wall can be reduced by increasing the width of the platform and reducing the ratio of slope to a certain extent. But these two measures will not work if the extent is exceeded, so they should be used reasonably in the design. (4) The research results can be used in subgrade supporting and retaining of railway and highway.

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