Huang C.,Chinese Academy of Sciences |
Xia Y.,China Railway 16th Bureau Group Co
Advanced Materials Research | Year: 2012
Urban rail transit plays a role of activating and leading regional economic development. It influences the spatial distribution of urban agglomeration and the progress of regional economic integration. It is a kind of virtuously cycled interactive relationship between regional economic development and regional rail transit. This paper analyzes the effect of urban rail transit construction project on regional economy based on the economic benefits arisen from it. The research results show that China's urban rail transit construction and regional economy can not realize balanced development unless the fact that the relationship between urban rail transit planning and regional economic development can be well coordinated, and meanwhile, the construction scale and service level of different phases of rail transit can be confirmed according to urban economic development level. © (2012) Trans Tech Publications, Switzerland.
Li J.P.,Southwest Petroleum University |
Li X.,Southwest Petroleum University |
Zhu D.Q.,China Railway 16th Bureau Group Co
Applied Mechanics and Materials | Year: 2014
The plane finite element analysis is mostly adopted in soft rock tunnel excavation instead of three-dimensional nonlinear finite element analysis at present, but almost every underground engineering is a spatial nonlinear problem which, in many cases, cannot be simplified into a plane problem. This paper presents a three-dimensional elastic-plastic finite element analysis of incremental variable plastic in soft rock tunnel excavation, through analyzing the tunnel excavation and support, and combining the incremental variable plastic stiffness method into three-dimensional elastic-plastic model in light of the advantage of increment variable stiffness method and the incremental additional load method. Simulation results show that, the three-dimensional elastic-plastic finite element analysis model presented in this paper changes little final deformation under different load release coefficients, together with small support stress. © (2014) Trans Tech Publications, Switzerland.
Qiu Y.-J.,Southwest Jiaotong University |
Liu Y.-L.,Southwest Jiaotong University |
Liu Y.-L.,China Railway 16th Bureau Group Co |
Yang E.-H.,Southwest Jiaotong University |
Xiang K.-M.,Transportation Group
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2014
In the practice of pressure grouting in subgrade retrofitting project of Mianyang-Guanyuan Highway, field monitoring, centrifugal model test and numerical simulation were carried out to study the technical process and the influencing factors of pressure grouting in subgrade disease. It is revealed that the geometrical property of subgrade section is the main reason to the differential settlement of subgrade, and then produces pavement premature failure such as longitudinal cracking. Centrifugal model test indicates that two-phase grouting method that with 0.2 MPa at the first stage and 0.4-0.5 MPa at the second stage is recommended. The recommended reasonable space between grouting holes is 2.0 m. Economy should be considered in the practice for choosing reasonable concrete mix proportion and maintenance time. Numerical simulation result shows that there are three stages for pressure grouting, such as stress accumulation stage, cracking extension stage and crack widening stage. The pressure for soil splitting increases with the increases of homogeneity and soil strength. ©, 2014, Chang'an University. All right reserved.
Huang H.,China Railway 16th Bureau Group Co
Modern Tunnelling Technology | Year: 2013
Using a tunnel on the Beijing Metro line 7 as an example, this paper predicts the surface settlement induced by tunnel excavation underneath the existing metro station using empirical methods, analytical methods, and numerical simulation. Soil reinforcement by means of deep-hole grouting and small pipe grouting was adopted where the tunnel passes under the existing metro station, which controls the surface settlement and ensures traffic safety within the existing station.
Liu Q.,China Railway 16th Bureau Group Co
Metallurgical and Mining Industry | Year: 2015
Aiming at the problem of low accuracy and low efficiency in the traditional way of mobile data collection, as well as the existing problem that the mobile data acquisition systems being specific to spatial position measurement and lacking of the universality characters, this paper proposes and develops a data acquisition system based on GPRS and mobile GIS technology, and applies the GIS, GPS and GPRS technologies to the mobile data collection operations. Combined with AicGISMobile9.3, the paper realizes the analysis of the system requirements and the functions proposed in the system design. Besides, this paper introduces the system applied in wetland planning survey. © Metallurgical and Mining Industry, 2015.