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Pan C.P.,China Communications Construction Company Ltd. | Pan C.P.,Shaanxi Key Laboratory of Road Disaster Prevention | Li X.,China Communications Construction Company Ltd. | Li X.,Shaanxi Key Laboratory of Road Disaster Prevention | And 5 more authors.
Applied Mechanics and Materials | Year: 2014

This work is aimed at carbonation resistance of steel slag concrete based on maximum utilization of industrial waste residue. The investigation is conducted to study the carbonization resistance of concrete which containing steel slag aggregate (SSA), steel slag powder (SSP) and blast furnace slag (GSP). The ordinary concrete as baseline group, the other concrete are fabricated with the 25% SSA, in combination with 30% SSP and 20% GSP by total binder content. The microscopic properties are analyzed by XRD, SEM, micro-hardness tests etc. Experimental results indicate that the carbonation depth of concrete which adding 25% SSA, 30% SSP and 20% GSP, have lower carbonation depth significantly than the reference at 28 day and 56 day. The substitution of natural aggregate and cement are 25%, 50% respectively by industrial waste residue, that can improving microstructure of aggregate-cement stone interface, optimizing cementitious materials hydration environment, concrete presents better durability performance. © (2014) Trans Tech Publications, Switzerland. Source


Zhai M.,China Communications Construction Company Ltd. | Zhai M.,Shaanxi Key Laboratory of Road Disaster Prevention | He P.,China Communications Construction Company Ltd. | Ge S.,China Communications Construction Company Ltd. | And 6 more authors.
Journal of Earthquake Engineering and Engineering Vibration | Year: 2013

Road net disaster mechanism was analyzed on the basis of seismic damage investigation in Zhaotong , Yiliang earthquake , Yunnan province , September 7 , 2012 , and effective measures were proposed. Monte-Carlo method is applied to generate random traffic flow considering the parameters , such as vehicle type , distance etc from Yiliang to Luozehe and obtain relief vehicle load model after earthquake. Research can not only provide standard for rapide stimate and repair of bridge after earthquake but also give theoretical basis for revising seismic codes or guidelines in China. Source


He P.,China Communications Construction Company Ltd. | He P.,Shaanxi Key Laboratory of Road Disaster Prevention | Ge S.,China Communications Construction Company Ltd. | Ge S.,Shaanxi Key Laboratory of Road Disaster Prevention | And 2 more authors.
Advanced Materials Research | Year: 2013

Monte-Carlo was applied to generate random traffic flow after frequent, moderate andrare earthquake respectively based on sample of vehicle investigation in"907"Zhaotong, Yiliangearthquake (2012), Yunnan province, considering vehicle parameters, such as types, driving,distance, ratio in earthquake-relief campaign. Vehicle load effect was analyzed for different spans ofSimply Supported Beam Bridge, then characteristic value of lane loading which ruled by 〈GeneralCode Designs of Highway Bridges and Culverts(JTG D60-04)rang;(China) was revised. Research cannot only provide standard for rapid estimate and repair of bridge after earthquake, but also givetheoretical basis for revising anti-seismic codes or guidelines in China. © (2013) Trans Tech Publications, Switzerland. Source


Pan C.,China Communications Construction Company Ltd. | Pan C.,Shaanxi Key Laboratory of Road Disaster Prevention | Wu Q.,China Communications Construction Company Ltd. | Wu Q.,Shaanxi Key Laboratory of Road Disaster Prevention | And 4 more authors.
Modern Tunnelling Technology | Year: 2015

Rockfalls are serious hazards in mountainous areas, and cantilever shed tunnels are a key measure against the impact of rolling stones. While in practical engineering it is very common for cantilever shed tunnels to be damaged by falling rock, few studies on the properties of the cantilever shed tunnel against the impact of falling rock have been conducted so far. In this paper, using ANSYS/LS-DYNA finite-element analysis software, a model of the common cantilever shed tunnel found in mountainous areas was established and a simulated analysis of the dynamic response process of the cantilever shed tunnel against the impact of falling rock was carried out to study the resulting deformation properties. The study results show that: 1) under the impact of falling rock, shock waves are generated in the shed tunnel and the transmission of these waves will result in stress and deforming vibrations; 2) the amount of time to reach the maximum stress at different parts of the shed tunnel is different; 3) the most dangerous places in the cantilever shed tunnel during a rockfall are the junction of the inside top wall and the plate as well as the lower part of wall, so that local strengthening should be adopted in these areas to ensure the safety of the structure; and 4) larger residual stress will remain inside the shed tunnel after the impact of the falling rock, so clearing of the fallen rock at the top of the tunnel should be undertaken in a timely manner. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source

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