Applied Mechanics and Materials Vols. 405-408

Abstract: In terms of oil and natural gas pipe to be installed in working shaft, and in light of basic dimension of slurry shield machine and its supporting system, required parameters of working shaft, such as its diameter, lining structure, building envelope have been presented in this paper. Meanwhile, the thickness of building envelope and permanent concrete lining for working shaft is also proposed through the analysis of its elastic stability and anti-buoyancy under influence of earth and ground water pressure.

Abstract: Shape of smoke dampers is the important technical parameters for point exhaust system of side direction. This article through theoretical analysis, using CFD software Ansys Fluent by CO as tracer gas ,analysis smoke extraction efficiency for different shape of smoke dampers in order to better ensure capture efficiency. After analysis, the flat shapes of smoke dampers have better capture efficiency.

Abstract: The submarine geology characteristic for Qingdao submarine tunnel is fracture and fragmentation with smash rock mass and unevenly distributed rock mass strength. The submarine tunnel is excavated in a weathered rock mass containing water. Before the tunnel lining is constructed, it is important to assure the stability and safety for the rock tunnel and tunnel lining structure during construction and operational periods. As the submarine tunnel is under severe condition, the rock mass stabilization is to a large extent to be determined by the underwater seepage effect. It is fundamental to investigate how the seawater interacts with the tunnel rock mass stress field. To investigate the interaction between the rock mass seepage field and the secondary stress field, the nonlinear finite element software ABAQUS is used to analyze the interaction behavior between the rock mass seepage effect and the tunnel secondary stress field. The rock mass seepage field, stress field are analyzed in detail using the numerical simulation method. Also, the distribution of the tunnel rock mass plastic region is obtained. The numerical analysis results provide guidance for the submarine tunnel construction.

Abstract: Based on the catastrophe theory, a research method of safe distance between concealed karst cave and tunnel is put forward. The stability of rock stratum between concealed karst cave and tunnel is evaluated by the catastrophe theory, the catastrophe mode of rock strata system destabilization is established through the research of rock stratum total potential energy between karst cave and tunnel, then the safe distance calculation formula between concealed karst cave and tunnel are deduced, which is veried by an engineering example.

Abstract: According to the different topographic and geologic conditions of mountain highwaytunnel project has been "It is difficult into the hole and out the hole " argument. The paper is WuGuanhigh-speed road asymmetric bias multi-arch tunnel, and the orthogonal hole separated tunnel, near themountain steep high slope of shallow buried tunnel into the hole as an example. Through theconstruction of practical engineering, analysis in special conditions is done and the mechanicalmechanism of hole program is correctly chosen. Importance and the experiences are summarized, toguide the engineering practice.

Abstract: Taking portal segment in some shallow-buried tunnel in seismic region with strong motion as objects of study, the finite element analysis method was used to compare and assess the seismic behavior of the tunnel with different cross section shape. The results show that the linings displacement response of the tunnel with different cross section shape differs very minor under seismic load. Meanwhile there exists obvious difference in the lining internal forces of the tunnel with different cross section shape. Among all the tunnel with different section shape, the mechanics situation of the tunnel with triple arched sections is the best. While the section of the tunnel is closer to circular in shape, the mechanics situation of the lining can be effectively improved under seismic load.

Abstract: Deformation of segment and rock is one difficult question of the subway design. When building the calculation model of the liner we mainly think about the effect on the liner of the joint and the resistance force of the earth. In this paper the joint of the model of the used model is improved and the inner force formulas for the new model are derived. At last, the derived formulas and the existing formulas are validated by Harbin Metro Line 1. According to the research result, we can know the formulas derived in the paper are credible and they have academic practical meaning for design and construction of the subway liner.

Abstract: It’s difficult to perform underwater positioning for submarine immersed tube tunnel construction in deep water and torrent condition due to the complex underwater environment and absence of traditional survey method, we developed a 3D computer aided construction application with assistance of advanced measurement equipment. A laser aiming equipment is also utilized to acquire the subtle offset caused by the current flow. This paper described design and development of the data communication, core calculation model,display model and auxiliary tool model in detail, and also shows how they are utilized during the submarine immersed tube tunnel construction.

Abstract: High speed railway tunnel have many uncertainty hazard factors in construction, at the stage of construction drawing design and during tunnel construction process. Taking no.1 tunnel in Xuefeng Mountain as a deep buried tunnel in the paper, tunnel construction risk source and main risk identification are analysis, main risk assessment during construction is recognized and reference for other similar projects is provided.

Abstract: Based on the DaDu mountain tunnel of new construction ShangHai-KunMing high-speed railway, combine with field geology investigation of the tunnel address area comparative analysis TRT advanced geological prediction, infrared probe water, ground penetrating radar advance geological forecasting and tunnel design data, aimed at fault fracture zone, high-pressure water-rich belt, the karst fissures developmental situation may have in construction period of DaDu mountain tunnel, carried out the comprehensive advanced geological prediction and then combined with the actual excavation situation contrast and verify the feasibility and practicality of the comprehensive geological advanced prediction technology, and it will have important significance of reference for the similar tunnel project in design and construction period.