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Lin D.-M.,CAS Institute of Geology and Geophysics | Lin D.-M.,University of Chinese Academy of Sciences | Shang Y.-J.,CAS Institute of Geology and Geophysics | Sun F.-J.,China Railway Construction Corporation | And 5 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

In-stitu tests can not be broadly used due to time and funds restrictions, so the strength assessment of jointed rock mass is the problem what engineers concern in practical engineering, Because of its complexity at present there is not yet any rock mass failure criterion can meet practical requirements. For the jointed rock mass, the authors refer research results at home and abroad, Combined with large amount of collected-data and amended the empirical formula based on joint density, a relationship between rock elastic wave velocity and rock mass strength is presented; collect number of empirical formulas based on joint density, rock mass classification, elastic wave velocity, the authors apply their three methods to Jiubao and find that the results fit the practical rock mass strength. Source

Zhang Q.,Beijing University of Technology | Tao T.,Beijing University of Technology | Wang X.,Beijing University of Technology | Zhai Y.,Beijing University of Technology | Zhai Y.,China Railway Construction Corporation
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2015

The problem of environmental pollution caused by construction waste become more and more serious, it has been attracted extensive attention of the society. To solve the problem of disposal of waste slurry in cast-in-situ bored pile construction, this paper introduces a method of using chemical flocculant to separation of solids from liquid for the waste slurry through the test. The method realizes the fast Solid-Liquid Separation for waste slurry by adding polyacrylamide and CaO. After the treatment, the waste slurry become more loose like dry soil, and this method has advantage in convenient transportation, simple procedure, fast treatment cycle, effectively improves the problem of environmental pollution and reduces the processing cost. It suitable for different consistency of waste slurry caused by constryction. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved. Source

Jiang H.-L.,China Railway Construction Corporation | Zhi X.-Y.,CNR Institute of Neuroscience | Zheng S.,CNR Institute of Neuroscience | Hou C.-J.,CNR Institute of Neuroscience
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The advantages and disadvantages of induction heating and blowing plus fog spray quenching process of rails, and induction heating and fog spray quenching process of AT switch rail head were outlined. Moreover, medium frequency induction heating and all blowing slow quenching (SQ) process of 60 D40 switch rail head for PDL was improved and optimized. For instance, inductor for rail head was improved; blowing device was designed and adopted; temperature was measured online and key workmanship parameters were displayed and stored on PLC touch screen; bending deformation technology and device were adopted to minimize the deformation of the switch rail. After heat treatment of 60 D40 switch rail of turnout for PDL, the geometry and properties examination demonstrate that the heating layer shape, hardened layer depth and hardness distribution, microstructure, heel deformation and surface hardness and distribution of HEZ, expansion of rail head sample, axial fatigue performance, longitudinal residual stress at the center of rail base and line surface and form tolerances fully meet the requirements of TB/T 1779-1993 "Quenching Technique Conditions of Turnout Rails and Railway Science and Technology", No. [2005] 135 "Manufacture and Acceptance Interim Technique Conditions of Turnout for PDL. ". Source

Zhang Y.,North China University of Technology | Liu H.,China Railway Construction Corporation | Zhao S.,North China University of Technology
Applied Mechanics and Materials | Year: 2012

Based on the test of 108 blocks with 150mm × 150mm × 300mm, 54 blocks with 150mm × 150mm × 150mm, elastic modulus of that of combined aggregate concrete is studied, and the influencing factors on it are discussed. The results show that the elastic modulus of combined aggregate concrete are very much affected by the ratio of common aggregate to lightweight aggregate, and it increases with the water-cement ratio decreasing. The calculation equation of combined concrete modulus is suggested. © (2012) Trans Tech Publications. Source

Zhang Y.,North China University of Technology | Liu H.,China Railway Construction Corporation | Song Z.,North China University of Technology
Applied Mechanics and Materials | Year: 2012

Based on the test, the shear behavior of combined aggregate concrete beams is studied. The results show that combined aggregate concrete beam have similar behavior with ordinary concrete beams, and the shear capacity reduces with the increase of lightweight aggregate. And design formula of the combined aggregate concrete shear capacity is suggested. © (2012) Trans Tech Publications. Source

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