China Railway Tunnel Group Co.

Luoyang, China

China Railway Tunnel Group Co.

Luoyang, China
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Du H.,China Railway Tunnel Group Co. | Du J.,Shijiazhuang Railway Institute | Huang S.,Shijiazhuang University
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In the process of subway station construction, many large construction equipments are placed in a narrow area where the operations are highly dense and the equipments have to carry heavy load and move or rotate in a broader space. In addition, there are tall equipments carrying out aerial operation. Some construction equipments are placed in limited underground space. These special conditions bring extremely high risks to subway station construction. This paper probes into (1) the application of BIM in summarizing and dynamically managing all the information and data in the process of construction; and (2) the installation of GPS receiver OEM board on large, high-risk construction equipments, the utilization of GIS and GPS data in dynamic management of three-dimensional geographic spatial location information of machineries and the visualized management of all data and information. In addition, this paper analyzes the risks related to large construction equipments and neighboring buildings and controlling methods. In this paper, the author suggests to integrate GIS, GPS and BIM to develop construction early warning and risk management systems so as to dynamically monitor the conflict risks among cranes, drilling machines, excavators, loaders and dumpers, the risks of collision between equipments and neighboring buildings and the risks of deformation and structure damage of foundation pits and retaining walls. Lastly, this paper analyzes the functional needs of the early warning and management system, which provides a theoretical reference for the development and implementation of this system. © ASCE.


Zhang Y.-J.,CAS Wuhan Institute of Rock and Soil Mechanics | Yang C.-S.,China Railway Tunnel Group Co.
Journal of Central South University of Technology (English Edition) | Year: 2012

The models of stress corrosion, pressure solution and free-face dissolution/precipitation were introduced. Taking a hypothetical nuclear waste repository in an unsaturated dual-porosity rock mass as the calculation objective, four cases were designed: 1) the fracture aperture is a function of stress corrosion, pressure solution and free-face dissolution/precipitation; 2) the fracture aperture changes with stress corrosion and pressure solution; 3) the fracture aperture changes with pressure solution and free-face dissolution/precipitation; 4) the fracture aperture is only a function of pressure solution, and the matrix porosity is also a function of stress in these four cases. Then, the corresponding two-dimensional FEM analyses for the coupled thermo-hydro-mechanical processes were carried out. The results show that the effects of stress corrosion are more prominent than those of pressure solution and free-face dissolution/precipitation, and the fracture aperture and relevant permeability caused by the stress corrosion are only about 1/5 and 1/1000 of the corresponding values created by the pressure solution and free-face dissolution/precipitation, respectively. Under the action of temperature field from released heat, the negative pore and fracture pressures in the computation domain rise continuously, and are inversely proportional to the sealing of fracture aperture. The vector fields of flow velocity of fracture water in the cases with and without considering stress corrosion are obviously different. The differences between the magnitudes and distributions of stresses within the rock mass are very small in all cases. © 2012 Central South University Press and Springer-Verlag Berlin Heidelberg.


Zhang Y.-J.,CAS Wuhan Institute of Rock and Soil Mechanics | Yang C.-S.,China Railway Tunnel Group Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

On the basis of using the models of stress corrosion and pressure solution established by Yasuhara et al, the solute concentration field is introduced into the 2D FEM code of thermo-hydro-mechanical coupling analysis for dual-porosity medium developed by the authors. Aiming at a hypothetical nuclear waste repository in unsaturated rock mass from which there is a nuclide leak, two computation conditions are designed: (1) the fracture apertures are changed with the stress corrosion and pressure solution (the porosity of intact rock is also a function of stress); (2) the fracture apertures and the porosity of intact rock are constants, then the corresponding two-dimensional numerical simulation for the coupled thermo-hydro-mechano-migratory processes is carried out; and the states of temperatures, rates and magnitudes of aperture closure, pore and fracture pressures, flow velocities, nuclide concentrations and stresses in the rock mass are investigated. The results show that the aperture closure rates caused by stress corrosion are almost six orders higher than those caused by pressure solution; and the two kinds of closure rates climb up and then decline, furthermore tend towards stability; when the effects of stress corrosion and pressure solution are considered, the negative fracture pressures in near field rise very high; the fracture aperture and porosity decrease in the case 1, so the relative permeability coefficients reduce; therefore the nuclide concentrations in pore and fracture in this case are higher than those in case 2 because the effects of negative pore and fracture pressures on the stress balancing are not reckoned in; the magnitudes and distributions of stresses within the rock mass in two calculation cases are almost the same.


Liu Z.,Luoyang Institute of Science and Technology | Liu Z.,China Railway Tunnel Group Co. | Wang M.,China Railway Tunnel Group Co. | Fang J.,China Railway Tunnel Group Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

The Wushaoling tunnel passes through a squeezing tectonic region involving several faults. Due to the high geo-stresses, the phyllite-containing slate at the mountain ridge is fractured and extremely low in strength. At the beginning of the construction, the primary reinforcement system underwent large deformation, resulting in serious distortion, cracks and damages to the shotcrete and the shape-steel arches. Four trial sections with different reinforcement parameters were installed at the site, and evaluation based on the construction monitoring information is made about the deformation of the surrounding rock mass and the reinforcement structures. The in-site study indicated that failure of the primary reinforcement structure resulted from the large deformation of the tunnel spring and the wall as well as the side earth pressure; the flexible prestressed anchor could replace the temporary strut; the H175-shape steel arch was a better primary support structure than the I20-shape steel arch; the primary reinforcement system composed of the H175-shape steel support, the flexible prestressed anchor and the steel fiber reinforced concrete was effective for control of the large deformation of the tunnel.


Wang H.,China Railway Tunnel Group Co. | Wang H.,Southwest Jiaotong University
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

Combined with engineering geological conditions of bridge foundation slope, deformation and failure process on the condition of natural state and loading is simulated and analyzed by floor-friction test method based on similarity principle qualitatively. The test results indicate that the rock masses of slopes at left and right banks are in stable state under the condition of natural state; under the condition of loading rock mass in left bank is in stable state; but the scattered earth-body in right bank is unstable; so that the right bank slope is in unstable state. A measure is suggested by pre-reinforcement or changing the location of bridge pier.


Li Y.,China Railway Tunnel Group Co. | Li Z.,China Railway Tunnel Group Co. | Wang Q.,China Railway Tunnel Group Co. | Jiao L.,China Railway Tunnel Group Co.
Modern Tunnelling Technology | Year: 2013

In order to ensure the safety of subsea tunnel construction in a soft fractured stratum, advanced geological forecasting was performed and the selection standard of grouting schemes, grouting material, grouting parameters, grouting technology, and a grouting effect test were analyzed and summarized in light of the characteristics of this stratum. This paper discusses the general scheme of grouting reinforcement and water-stoping technique for mined subsea tunnels in weak, broken strata and describes its applications in the Qingdao Jiaozhou Bay and Xiamen Xiang'an subsea tunnels.


Zhang M.,China Railway Corporation | Sun G.,China Railway Tunnel Group Co. | He Z.,China Railway Corporation | Gao G.,China Railway Tunnel Group Co.
Modern Tunnelling Technology | Year: 2013

During construction of the Zhongtianshan tunnel, a developed joint zone was encountered with water pressure of up to 6.3 MPa and a water inflow of 500 m3/h/probing hole, causing a flood disaster in the tunnel. In this context, the principle of "drainage reduction by grouting and depressurizing by dewatering" was adopted. The grouting and dewatering design parameters, the new hole-drilling technology with "high pressure percussion drilling," and the new grouting technology with simultaneous grouting and discharging at the same working face are described in this paper. Prospective effects of water blocking by grouting are achieved based on the analysis of a P-Q-t curve, water inflow in the drilling hole, water inflow in the testing hole, and stability in the testing hole, ensuring the success of tunnel construction.


Guo W.,China Railway Tunnel Group Co. | Liang K.,China Railway Tunnel Stock Co. | You Y.,China Railway Tunnel Stock Co.
Modern Tunnelling Technology | Year: 2015

Regarding the sea-crossing, shield-driven intake tunnel of the Taishan nuclear power project, four risks of sea -crossing shield tunnelling, i.e., geology, shield adaptation, environment and construction, were determined from the perspective of project risk management. Based on successful engineering practice, the risk management schemes and technological countermeasures are discussed in detail in this paper for each risk factor. The results show that: 1) the selection of a sea-crossing tunnel construction method is essential for avoiding project risks; 2) project risks should be resolved based on detailed geological investigation, and by the seismic reflection method with high frequency and density it can get good results in the detection of boulders and bedrock; 3) good geological adaptability of the shield machine is key for eliminating project risks; 4) in light of the domestic technological level of shield tunnelling at present, construction risks can be resolved smoothly based on a detailed geological investigation and good geological adaptability of the shield machine; 5) in terms of the slurry treatment scheme with two-stage screening+two-stage rotational flow+filter pressing, a zero-discharge of waste slurry was achieved, thereby providing a reference for the environmental protection schemes of similar projects. © 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Liu C.,Fuzhou University | Liu Z.,China Railway Tunnel Group Co.
Modern Tunnelling Technology | Year: 2014

Water inrush often occurs during tunnel construction in karst areas due to their complexity, and this frequently results in surface settlement. This paper proposes an analytical method for construction in a karst development zone in light of water inrush induced surface settlement, namely to analyze the features of the surface settlement with a settlement diagram, to determine the geological structures of the karst development zone, to study the zone's boundary with geological data related to the settlement area, and to analyze the supply relation between the water inrush and rivers according to the relationship between the settlement centre and the rivers. Additionally, using the data of surface settlement induced by water inrush at YDK24 +098 of the Xiangshan tunnel on the Longyan-Xiamen railway, this paper analyzes the geological structures of the karst development zone, the longitudinal boundary of the karst, and the supply relation between the water inrush and the rivers, thereby verifying the feasibility of the above mentioned analytical method.


Wu F.-Z.,China Railway Tunnel Group Co. | Fu Z.,China Railway Tunnel Stock Co.
Journal of Railway Engineering Society | Year: 2014

Research purposes: Tongzhai tunnel entrance was affected by the same high stress, and other geological factors carbonaceous slate role in the early stages to I18 steel support parameters based support, the construction of large deformation occurs, arch distortion, shotcrete off, seriously affecting construction safety and progress.This paper is finding solutions to large deformation method to provide a reference for the subsequent construction. Research conclusions: (1)In the stress deformation by the engineering test, take the anti - supporting measures, adhere to the "strong first and optimization late" principle, support in place at a time, so as to control the deformation. (2) Soft surrounding rock after excavation is timely supported, enclosing to ring as soon as possible, and timely radial grouting to effectively strengthen loose rock, improve the surrounding rock properties, reduce rock pressure effected on the supporting structure, the support and surrounding rock stress system has formed, to restrain the deformation of tunnel. (3) Reduce the times of the excavation, set the inverted arch as early as possible, control the initial support closing time strictly. (4) The control measures of deformation of tunnel carbonaceous slate can provide reference for similar engineering.

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