China Tiesiju Civil Engineering Group Co.

Hefei, China

China Tiesiju Civil Engineering Group Co.

Hefei, China

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Zhou Y.,Beijing Jiaotong University | Zhu E.,Beijing Jiaotong University | Li X.,Beijing Jiaotong University | Li X.,China Tiesiju Civil Engineering Group Co. | Zhong M.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2014

The temperature difference control measures of circulating water through prestressed ducts and ventilating through the box girder cavity are put forward in the paper due to the temperature cracks resulted from excessive temperature difference between inside and outside the concrete. The parameters of the thermal stress field simulation are determined. Parameter values are verified accurately according to the comparison between simulation results and the test results. Thermal stress fields of simply supported box girder are simulated respectively in the state of nature curing and temperature control measures. The results show that the maximum compressive stress reduces from 2.77 MPa of fulcrum section to 2.21 MPa of mid-span section, and the maximum tensile stress reduces from 1.255 MPa of fulcrum section to 1.00 MPa of mid-span section, which makes the temperature crack effectively controlled. In addition, the limited value of 15°C of temperature difference of the specification appears to be too rigorous, and can be relaxed to 20°C.


Li X.,Beijing Jiaotong University | Li X.,China Tiesiju Civil Engineering Group Co. | Zhu E.,Beijing Jiaotong University | Zhou Y.,Beijing Jiaotong University | Qin Y.,North China University of Water Conservancy and Electric Power
Applied Mechanics and Materials | Year: 2011

Due to the usage of high-strength concrete, excessive hydration heat is generated in the whole span box girder of high-speed railway. The maximum allowable temperature should not exceed 60°C according to the Technical Guide on Railway Bridge Construction of Passenger Dedicated Line. However, according to the field measurement and simulation to the maximum temperature of box girder concrete, we find that the maximum hydration temperature of concrete is generally more than 60°C which is the limited value of the specification. The research results show that the limited value of maximum hydration temperature for box girder concrete can be relaxed to 60°C. © (2011) Trans Tech Publications.


Li X.,Beijing Jiaotong University | Li X.,China Tiesiju Civil Engineering Group Co. | Zhu E.,Beijing Jiaotong University | Zhou Y.,Beijing Jiaotong University | Qin Y.,North China University of Water Conservancy and Electric Power
Applied Mechanics and Materials | Year: 2011

in the process of steam curing to high-speed railway's simply-supported box girder, there are some problems must be faced such as the difficulty to determine steam curing system and to achieve automatic temperature control. With the construction site conditions of simple-supported box girder in Longwang beam field which is located on Shijiazhuang-Wuhan (Shi-Wu) section of Beijing-Guangzhou high-speed railway, the paper proposes the appropriate steam system for simply-supported box girders, determines the appropriate equipments, explores the temperature control system in the process of steam curing to the simply-supported box girder's concrete, and takes the temperature test of steam curing in the field. Results show that, the steam curing technology in this paper can increase the production efficiency of beam in production site, and effectively guarantee the prefabricated quality of simply-supported box girder. © (2011) Trans Tech Publications.


Deng X.F.,China Tiesiju Civil Engineering Group Company | Deng X.F.,Southwest Jiaotong University | Zhu J.B.,Hong Kong Polytechnic University | Chen S.G.,Southwest Jiaotong University | And 4 more authors.
Tunnelling and Underground Space Technology | Year: 2014

In this study, numerical modeling on the damage of existing circular tunnel subject to blast-induced shock wave was carried out with DEM-based code UDEC. The disturbed zones including failure zones, open zones and shear zones around circular tunnel and peak particle velocities (PPVs) at tunnel surface are employed to analyze the damage of tunnel. The effects of joint spatial and mechanical properties, initial stress of rock mass, and magnitude of shock wave amplitude to damage of tunnel were evaluated in this study. The difference of damage between non-supported circular tunnel and bolt-supported circular tunnel subject to the same blast-induced shock wave was also studied. It is found that the orientations of joints in rock mass around the tunnel have great effects on tunnel damage. The initial stress around tunnel has relatively small influence on tunnel damage. The bolt support could greatly increase the stability of tunnel by changing the vibration form of particle velocity rather than the decreasing of PPV. © 2014 Elsevier Ltd.


Deng X.F.,China Tiesiju Civil Engineering Group Company | Chen S.G.,Southwest Jiaotong University | Zhu J.B.,Hong Kong Polytechnic University | Zhou Y.X.,Defence Science and Technology Agency | And 2 more authors.
Rock Mechanics and Rock Engineering | Year: 2014

In this study, numerical modeling of a large-scale decoupled underground explosion test with 10 tons of TNT in Älvdalen, Sweden is performed by combining DEM and FEM with codes UDEC and AUTODYN. AUTODYN is adopted to model the explosion process, blast wave generation, and its action on the explosion chamber surfaces, while UDEC modeling is focused on shock wave propagation in jointed rock masses surrounding the explosion chamber. The numerical modeling results with the hybrid AUTODYN–UDEC method are compared with empirical estimations, purely AUTODYN modeling results, and the field test data. It is found that in terms of peak particle velocity, empirical estimations are much smaller than the measured data, while purely AUTODYN modeling results are larger than the test data. The UDEC–AUTODYN numerical modeling results agree well with the test data. Therefore, the UDEC–AUTODYN method is appropriate in modeling a large-scale explosive detonation in a closed space and the following wave propagation in jointed rock masses. It should be noted that joint mechanical and spatial properties adopted in UDEC–AUTODYN modeling are determined with empirical equations and available geological data, and they may not be sufficiently accurate. © 2014, Springer-Verlag Wien.


Bian C.,Hohai University | Tian Z.,Hohai University | Mao L.,China Tiesiju Civil Engineering Group Co. | Wu J.,Sinohydro Bureau Seventh CO.
Indian Journal of Engineering and Materials Sciences | Year: 2015

The influence of voltage applied for better demoulding concrete on its properties including hydration process at early age, formed pore structure, surface permeability and compressive strength is studied through a series of methods such as conductivity, non-evaporable water content and mercury intrusion porosimetry (MIP). Test results show that: (i) increasing voltage results in a drop in degree of hydration caused by assemble of cement grains on one hand and on the other hand the increase of quantity of water transported toward cathode and anode due to the effect of electro-osmosis; (ii) as the voltage increases, the porosity, critical pore radius and volume fraction of larger capillary pores decrease at first mainly due to reduction of water-cement ratio (w/c) by displacing water then increase caused by reduction of degree of hydration and water block at the concrete/mold interface, but placing filter cloth on the mold walls could slow down the adverse changes of properties; (iii) variation of surface permeability with voltage is similar with that of porosity as well as critical pore radius and the permeability has a good correlation with the two parameters while compressive strength is good correlated with volume fraction of larger capillary pores. © 2015, Indian Journal of Engineering and Materials Sciences. All rights reserved.


Zhu E.-Y.,Beijing Jiaotong University | Wang B.-W.,China Institute of Water Resources and Hydropower Research | Zhou Y.-Z.,Beijing Jiaotong University | Li X.-M.,Beijing Jiaotong University | Li X.-M.,China Tiesiju Civil Engineering Group Co.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

Taking Chongqing area's acid rain type as a prototype, the corrosion rule of acid rain to prestressed system is studied by using periodic immersion method to simulate accelerated corrosion test under the free-tension and tension states, involving the corrosion depth and mechanical properties change rule of the PC strand, anchorage, corrugated pipe and so on after corrosion. The results show that the epoxy coating steel strand and its anchorage has a better anti-corrosive performance. Compared with the metal bellows, plastic corrugated pipe has obvious advantages of corrosion resistance to acid rain. After been corrod? ed by acid rain for 3 000 hours, cross-section loss rate of common strand is less than 5%, the tensile strength decreased about 1.5% to 2%, while the elongation ratio lost more. The strength of the anchorring decreased around 5%, and the corrosion depth is basically the same as that of steel strand. The experimental values of corrosion depth for prestressed steel strand and loss rate are well argee with the theoretical data.


Zhu E.-Y.,Beijing Jiaotong University | Wang B.-W.,China Institute of Water Resources and Hydropower Research | Zhou Y.-Z.,Beijing Jiaotong University | Li X.-M.,Beijing Jiaotong University | Li X.-M.,China Tiesiju Civil Engineering Group Co.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

In the construction of post-tensioned prestressed concrete projects, the bleed water of grout in ducts seriously affects the durability of prestressed system. Combination with different grouting techniques, grouting compactness experiments of prestressed duct with kinds of grout materials produced by domestic manufacturers were carried out. The results show that there are bleed water in all kinds of grout materials and the ducts cannot be completely filled with grout. Grouting quality of vacuum-aided grouting technique is better than that of ordinary grouting technique, but it still cannot effectively solve the problem of grout bleeding. Based on the grout compacting device with independent intellectual property, the grouting compactness experiment of bellows with narrow pass was carried out, and the result proved successful. This kind of bellow can effectively deal with the grout bleeding, and reach the purpose of possessing well bond strength between grout and prestressed tendon and protecting the prestressed tendon from corrosion.


Li X.M.,Beijing Jiaotong University | Li X.M.,China Tiesiju Civil Engineering Group Co. | Zhu E.Y.,Beijing Jiaotong University | Zhou Y.Z.,Beijing Jiaotong University | Qi Y.Q.,Laiwu Advanced Vocational School
Applied Mechanics and Materials | Year: 2012

The construction of precast box girder plays a pivotal role in the process of building passenger dedicated lines. But the high temperature and low-speed of cooling rate inside the box girder will seriously reduce the box girders' quality and delay the project duration. So, some methods such as cooling by means of circulating water in drill way etc. are presented in this paper. Then temperature tests are carried out for the box girders with different cooling measures, and the respective data are analyzed. The results show that the proposed cooling methods can effectively reduce the highest temperature, speed up the cooling rate inside the box girder and decrease the temperature difference between the interior and the exterior of the concrete. © (2012) Trans Tech Publications.

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