摘要：
In highway engineering project construction process, the traditional management can not meet the demand of economic development any more. According to the requirement of economic society development with scientific development perspective, under the guidance of scientific development perspective, highway engineering construction management department has strengthened construction project management, optimized highway construction management measure and finished construction task as scheduled with high quality, high efficiency and low cost, which is a beautiful construction management measure. This article has proposed the application of new project management model to solve the problem of contradiction among quality, cost and schedule management, which has certain value in solving practical problems in highway reconstruction and extension engineering. The study in this article has contributed much to highway project management in theory and practice, which has done great benefit to reducing engineering cost, and improving project management & engineering quality.
作者机构：
[蒋建清; 李丽民] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[杨果林; 蒋建清] School of Civil Engineering and Architecture, Central South University, Changsha 410075, China
通讯机构：
School of Civil Engineering, Hunan City University, China
期刊：
Geotechnical Special Publication,2011年(221 GSP):170-177 ISSN：0895-0563
通讯作者：
Mao, G.(gxm.mao@126.com)
作者机构：
[Xia, Yuanyou; Liu, Lingwei] Institute of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;Institute of Civil Engineering, Hunan City University, Yiyang 413000, China;[Mao, Guangxiang] Institute of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China<&wdkj&>Institute of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Mao, G.] I;Institute of Civil Engineering and Architecture, Wuhan University of Technology, China
会议名称：
2011 GeoHunan International Conference - Tunnel Management, Emerging Technologies, and Innovation
会议时间：
June 9, 2011 - June 11, 2011
会议地点：
Hunan, China
会议论文集名称：
Tunnel Management, Emerging Technologies, and Innovation
作者机构：
School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha, China;School of Civil Engineering, HuNan City University, Yiyang, China
通讯机构：
School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, China
作者机构：
[肖艳苹; 李文斌; 刘晓艳; 何运斌; 潘清林] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[李文斌] School of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Li, W.-B.] S;School of Materials Science and Engineering, Central South University, China
作者机构：
[Pan Qing-lin; Li Wen-bin; Xiao Yan-ping; Liu Xiao-yan; He Yun-bin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Li Wen-bin] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Pan Qing-lin] C;Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The microstructural evolution and composition distribution of an Al-Zn-Cu-Mg-Sc-Zr alloy during homogenization were investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that severe dendritic segregation exists in Al-Zn-Cu-Mg-Sc-Zr alloy ingot. There are a lot of eutectic phases at grain boundary and the distribution of the main elements varies periodically along interdendritic region. The main eutectic phases at grain boundary are Al7Cu2Fe phase and T (Al2Mg3Zn3). The residual phases are dissolved into the matrix gradually during homogenization with increasing temperature and prolonging holding time, which can be described by a constitutive equation in exponential function. The overburnt temperature of the alloy is 473.9 °C. The optimum parameters of homogenization are 470 °C and 24 h, which is consistent with the result of homogenization kinetic analysis.
作者机构：
[刘自由] School of Civil Engineering, Hunan University of City, Yiyang 413000, China;[林杭] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[江学良] School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410083, China
通讯机构：
School of Civil Engineering, Hunan University of City, China
作者机构：
[邓宗伟] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[邹金锋; 冷伍明] School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;[邓宗伟; 唐葭] School of Civil and Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Resources and Safety Engineering, Central South University, China
摘要：
In order to present basic guidance for system calibration of split Hopkinson pressure bar (SHPB) with the special shape striker, wave characteristics and dynamic responses of SHPB under striker impact were analyzed. Stress generated by the special shape striker tends to have a half-sine waveform and has little wave dispersion during its propagation. Impact velocities of the special shape striker and peak values of generated stress still have linear relation but with a different coefficient from that of cylindrical strikers. From stress histories on the surfaces of the input bar impacted by the special shape striker off-axially and obliquely, it is found that the misalignment impacts usually trigger wave distortion and amplitude decrease, which can be used to identify the poor system adjustment. Finally, the system calibration of SHPB with the special shape striker can be classified into four steps: system adjustment, wave distortion identification, measurement calibration and transmission calibration, where the measurement calibration factor and transmission calibration factor are elaborated and redefined.
