China Railway First Survey & Design Institute Group Co.

Fengcheng, China

China Railway First Survey & Design Institute Group Co.

Fengcheng, China
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Tang Z.,China Railway First Survey & Design Institute Group Co.
Modern Tunnelling Technology | Year: 2014

To avoid the problems such as safety, environmental pollution and noise pollution caused by the traditional mining method with blasting construction in urban metro project, the mechanized construction method, which is more economic, efficient, environmental friendly and safer, has already become an important subject in research of construction technology of current urban mass transit. As the Qingdao Metro mainly passes through hard granite stratum, a feasibility study of TBM construction for Qingdao Metro line 2 was carried out from aspects of geological characteristics, adaptability of TBM construction, TBM type and TBM construction risks. The results show that TBM construction in Qingdao Metro line 2 is feasible in technology, the risk is acceptable. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Sun J.-L.,China Railway First Survey & Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2016

Research purposes: For the large span floor of high speed railway station, through the establishment of finite element model, the vibration properties of the large-span floors in the structure were studied. The theory of structural vibration control was used and multiple tuned mass dampers (MTMD) was selected and used to control the comfort degree and the vibration of the structure in the crowd loads. Research conclusions: (1) The three-dimensional structure analysis model established by general finite element analysis software platform can analyze dynamic response of floor structure under various crowd load conditions before and after damping in the whole construct course, and compare the structures before and after the vibration in terms of peak acceleration index. (2) The MTMD scheme can effectively reduce the vibration acceleration peak of floor in the crowd load, which can make the structure meet requirements of degree of comfort in vibration caused by human and have good effect to control the vibration. (3) The research results can provide a theoretical reference and technical support of vibration control and comfort design of similar large span floor. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Li T.-E.,China Railway First Survey & Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2016

Research purposes: The low tower cable-stayed bridge is between PC continuous beam bridge and PC cable-stayed bridges, which has good technical and economical index. But this kind of bridge is rarely applied in railway. This paper took a (136+136) m railway low tower cable-stayed bridge as an example, introduced the design characteristics, and drew some reference conclusions through analysis of the design. Research conclusions: (1) The stress characteristic of low tower cable-stayed bridge is quite the same as beam bridge. Suspension cable is equivalent to the external prestressed cable of main girder. Bridge tower is equal to the steering equipment of external prestressed cable. The stress of bridge is clear and the cable is efficient. (2) Height of the tower has little effect on stiffness, but contributed significantly to the main beams, and cable has an obvious effect for girder main tensile stress. (3) The structure of the main girder is large, the stress amplitude of cable is small, and the fatigue resistance is improved obviously compared with the full cable-stayed bridge. (4) For cable-stayed bridge, the vertical load sharing rate of cables is influenced by human factors, so low tower cable-stayed bridge cannot be defined by cable vertical load share ratio. (5) Under some special conditions, low tower cable-stayed bridge has great competitive advantage in the field of railway construction. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Zeng C.,China Railway First Survey & Design Institute Group LTD
World Information on Earthquake Engineering | Year: 2015

According to two reinforced concrete beam-column exterior joints specimens under low reversed cycle loads, the seismic behavior of exterior joints are studied by analyzing the skeleton curves, deformation capacity, dissipated energy and so on. Furthermore, a parameter analysis is conducted to study the influence of axial compression ratio and reinforcement ratio on the seismic behavior of beam-column exterior joints by ABAQUS program. The results show that the failure mode of exterior joint changed from concrete crush failure at column ends to plastic hinge failure at beam ends with increasing the column moment magnification factor. The column moment magnification factor suggested current codes successfully achieved the expected design target of “strong column weak beam”. Additionally, the axial compression ratio of column plays little influence on the bearing capacity and seismic behavior of reinforced concrete joint if the exterior joint specimens failed due to beam failure. Increasing reinforcement ratio of column will increase the bearing capacity and improve the seismic behavior of reinforced concrete exterior joints after plastic hinge occurring at beam end. ©, 2015, Science and Technology Periodical Press. All right reserved.


Hou Y.-K.,China Railway First Survey & Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2016

Research purposes: The control of foundation settlement is extremely strict for high-speed railway, Lanzhou-Urumchi High-speed Railway crosses a wide range of Xinjiang and Gansu Gobi region, however the coarse-grained soils in Gobi region have collapsibility, so it will have large settlement when meeting water. Currently, the study of coarse-grained soils foundation mainly focuses on bearing capacity and shear strength, etc. There are few studies on collapse characteristics and deformation mechanism of coarse soils in Gobi region, so the study on collapse characteristics and deformation mechanism of coarse soils in Gobi region have very important significance for constructing high speed railway and other similar projects in Gobi region. Research conclusions: (1) The deformation properties of Gobi coarse soil under flooding conditions can be divided into three stages: compression deformation, collapse deformation and complex deformation. Collapse deformation stage has the fastest growing and the largest settlement. (2) The coarse grained soil in Gobi region have large collapsibility, and its mineral composition, microstructure and salinity are main internal causes for the collapsibility. (3) The mechanism of collapsing of coarse soil in Gobi region under flooding conditions is that the bond strength between particles decreases, the structures are destroyed under external force, movement of soil particles resulting in the occurrence of a large settlement. (4) This research enriches the collapse deformation theory of coarse soils in Gobi region, and provides reference for constructing high speed railway and other similar projects in Gobi region. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Wang T.-M.,China Railway First Survey & Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2016

Research purposes: As for the special shaped deep shaft located in the triangular block encircled by existing shield tunnel and ventilation pavilion, based on the protection of surrounding environment in water-rich gravel formation, this paper proposes the design and construction scheme for the special shaped deep shaft, which can guarantee the stability of shaft structure and the surrounding environment safety. Research conclusions: (1) Dewatering scheme for deep shaft which can efficiently control the outflow of fine particles is put forward. (2) The structural safety of the expansion excavation in deep shaft can be ensured on the basis of the large pipe shed installed downward on the shaft wall, the length of which is beyond the potential failure plane. (3) The adverse impacts of the special shaped deep shaft construction are mainly concentrated on the left side of shield tunnel, and the initial disturb should be controlled. (4) The overall structural stiffness of ventilation pavilion on the right side is bigger, the limited earth pressure between ventilation pavilion and deep shaft is lesser, and the influence of shaft excavation on the ventilation pavilion is smaller. (5) The schemes for special shaped deep shaft construction, especially the large pipe shed method, are feasible and economical, which can be applied in deep shaft engineering under the strict environmental protection requirements. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Li G.,China Railway First Survey & Design Institute Group Co.
Modern Tunnelling Technology | Year: 2015

The stratum passed by the Lanzhou-Chongqing railway is mainly loess, tertiary mudstone and sandstone, slate, carbonaceous slate and phyllite rock with regional faults, developed folds and high or extremely high geostress; therefore, the geological conditions are very complicated. In light of the technical problems during construction of the Lanzhou-Guangyuan section of the Lanzhou-Chongqing railway, this paper emphatically describes the construction problems encountered in tertiary weak consolidated pelitic fine water-rich siltstone, adopts countermeasures and analyzes characteristics of the soft rock squeezing deformation and stress state regarding tunnels in soft rock with high geostress. The grading standards and major control measures are presented for the large deformation of soft rock tunnels on the Lanzhou-Chongqing railway. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Wang P.,China Railway First Survey & Design Institute Group Ltd
Journal of Railway Engineering Society | Year: 2015

Research purposes: Based on the deformation control of a certain metro station in Chongqing in soil-rock composite stratum, the deformation reason and relevant countermeasures are put forward. Then, through numerical analysis, the defects of pile-anchor flexible retaining system are made clearly, and the advantage of composite retaining system of pile-anchor-strut is put forward. Research conclusions: (1) The excess deformation of foundation pit can be classified into internal and external factors. The internal factors include the interface of stratum inclining to foundation pit, the weaken of stratum interface because of rainfall, and the weak deformation control of flexible pile-anchor supporting system. The external factors include construction blast and overload due to tower crane on ground. (2) The failure of foundation pit is largely depended on excess deformation, rather than the strength failure of retaining structure. Deformation monitoring and dynamic feedback should be strengthened during construction. (3) As for the flexible pile-anchor retaining system, limited role for the control of continued deformation is found. The composite retaining system of pile-anchor-support can effectively reduce the tensile stress and deformation of anchor rod, and the stability of foundation pit can be realized. (4) The research conclusions can provide some references for similar project in future. © 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Xin W.-D.,China Railway First Survey & Design Institute Group Ltd
Journal of Railway Engineering Society | Year: 2015

Research purposes: There is high wind speed in Xinjiang Hundred Kilometres Gale Area and Yandun Wind Zone where the second double high speed railway construction from Lanzhou to Xinjiang was designed through, the harm of sand-driving wind is serious. In order to effectively avoid and reduce the harm of the sand disaster to ballastless track railway, the formation mechanism of the strong wind and activity rules of wind sand flow and characteristics of wind sand two phase flow are studied, the technology system of countermeasures to sand prevention is established, and the research results are applied to sand prevention design and construction of the line. Research conclusions: Through field measurement, indoor test, wind tunnel test, and numerical analysis, and by analyzing the Gobi sand movement characteristics, the results have be demonstrated: (1) When the dominant wind direction and the direction of the retaining sand wall are vertical, effect of sand blocking of sand barrier is the best, when the angle of them is changed gradually to the small angle, effect of sand guiding of sand barrier is obvious. (2) While height of the retaining sand wall is 2 m and ventilation rate is 40%, the effect of sand prevention is remarkable. (3) Facilities of sand resistance such as high vertical sand barrier, measures of sand fixing such checkerboard sand barrier as stone box, these engineering measures are suitable for the line. (4) The influence of sand damage to normal operations of the train is reduced because of sand control engineering, and the technical support is provide for the train to run all day. (5) The research achievements can provide the reference for sand prevention of strong wind zone of Gobi, and provide the theoretical and technical support for the revision of the relevant standards. © 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved.


Liu J.-L.,China Railway First Survey & Design Institute Group Co.
Journal of Railway Engineering Society | Year: 2015

Research purposes: The Shanxi-Shaanxi Yellow River Super Large Bridge is one of the major projects in Datong-Xi'an Railway. Bridge location of this super large bridge is controlled by many factors, especially hydrology, environmental protection, and military installations. In order to make the comprehensive optimum scheme, this paper makes a elaborate analysis and comparison between bridge location and the style of main bridge, finally obtains a technically feasible, economically reasonable bridge location scheme. Research conclusions: (1) After making a elaborate analysis and comparison between bridge location schemes, a reasonable recommended proposal is obtained which is technically feasible, economically reasonable, and easy to implement. (2) The achievement has been applied to Shanxi-Shaanxi Yellow River Super Large Bridge in Datong-Xi'an passenger dedicated line on July 7, 2014 and can provide reference for similar bridge constructions. ©, 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved.

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