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Fang Y.,Beijing Jiaotong University | Fang Y.,Anhui Expressway Holding Group Co. | Liu K.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2015

A non-linear support vector regression intelligent model which maps the relation between mountain tunnel drill blasting construction parameters, geological conditions and crown subsidence of surrounding rock and loose circle depth is established ultilizing the genetic algorithm and support vector regression coupling algorithm. The model is applied to the construction of Foling long and large highway tunnel. The model is first trained by the field testing data. Then the model is used to optimize the selection of drill blasting parameters with given control indexes such as geological conditions of surrounding rock, vault subsidence value and loose circle depth. The predicted drill blasting parameters are verified by one random selected cross section in Foling tunnel and the model is proved to be correct and feasible. The model can be used to guide the drill blasting construction in Foling tunnel and can provide references for drilling and blasting parameters control optimization in tunnel with similar conditions. ©, 2015, Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University. All right reserved. Source

Guan Q.,Anhui Expressway Holding Group Co.
Applied Mechanics and Materials | Year: 2014

Domestic and foreign road construction for many years of practical experience shows that pavement early damage and between the base and the surface layer of oil related to the quality of construction, the quality of life of the future road surface layer has a major influence [1]. In order for the preparation of high-permeable dialysis oils heavy investment in production, combined with permeable layer of oil in the production of enterprises, taking into account the conditions and existing equipment of enterprises, the paper layer on oil production, put forward the requirements for equipment, processing parameters, control indicators. © (2014) Trans Tech Publications, Switzerland. Source

Wang G.,Wuhan University of Technology | Zhang B.,Wuhan University of Technology | Shui Z.,Wuhan University of Technology | Tang D.,Anhui Expressway Holding Group Co. | Kong Y.,Wuhan University of Technology
Progress in Rubber, Plastics and Recycling Technology | Year: 2012

It is of great significance to improve the flexibility of concrete for specific applications, such as a tunnel pavement or an airport runway. This paper presents the structural properties of the rubberized lightweight aggregate concrete at the macro- and micro-level. The relationship between mechanical properties and microstructure features was further explored. An experimental programme was developed to use crumb rubber and shale ceramsite to produce a flexible concrete. Much attention was paid to the influence of the crumb rubber dosage. The compressive strength and elastic modulus of the rubberized lightweight aggregate concrete were measured. Furthermore, the corresponding microstructure was evaluated by microhardness assessment and microscopic observation. Experimental results show that with the increase of crumb rubber dosage, the bonding interface between the rubber and cement paste, as well as between the shale ceramsite and cement paste, gradually became weakened or flexible. In addition, the width of the weak bonding interface became wider. As a result the flexibility of lightweight aggregate concrete can be effectively improved by correctly adjusting the crumb rubber dosage. © Smithers Rapra Technology, 2012. Source

Lu X.,Anhui Expressway Holding Group Co. | Zhang S.,Anhui Province Transportation Occupation Technical College | Wu Y.,Indonesian Buton Rock Asphalt Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2015

Six different types of AC20 mineral aggregate gradation are provided with distinct Buton rock mixture, and the pavement performance of Buton rock asphalt mixture was conducted by taking AH-70 road asphalt as basis. The results show that rock mineral in raw materials of Buton rock asphalt has a great impact on the mineral aggregate gradation and pavement performance, and appropriate selection of rock mineral mixture can improve comprehensive pavement performance remarkably. The comprehensive pavement performance is close to that of SBS modified asphalt mixture with 0.5%-1.0% mixing content (by mass), but it is limited in improving the water sensibility of asphalt mixture. The relationship between the dynamic stability of Buton rock asphalt mixture and rock mineral content occurs in concave curve characteristics, and the influence of rock mineral content variations on the dynamic stability of asphalt mixture is remarkable. The raw material of Buton rock asphalt cannot be added into the matrix asphalt for carrying out Marshall test to determine the raw material content as SBS modifier. The particularity of Buton rock asphalt material should be considered during the mix design, and its rock mineral should be separated from the pure asphalt, and blended independently, or the mineral aggregate gradation of Buton rock asphalt will have a great impact on the performance of rock asphalt mixture. ©, 2015, Tongji University. All right reserved. Source

Lu X.,Anhui Expressway Holding Group Co. | Zhang S.,Anhui Province Transportation Occupation Technical College
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

Based on single factor and multi-factor of orthogonal test design, surface layer compaction thickness of asphalt mixture is affected by porosity. Analysis result shows that: different gradation of the surface layer influence is the most significant influencing factor, AC-13F most likely pressure fact, SMA-13 the most difficult compaction, AC-13C in between; by combing laboratory and field tests compared paving test, controlled porosity scope is proposed based on the AC-13C and AC-13F appropriate compacted thickness, the ratio of thickness and the maximum size, and the definition of the minimum compacted thickness and the best compaction thickness is given. Accordingly the technical requirement is given about compaction of the grading type of selected and coarse and fine asphalt mixture type of the surface level. Source

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