ZHANG Zheng-qi1, XU Yao-hui1, HU Hong-song2 , SHI Wei3 , ZHANG Ke1
(1.Key Laboratory of Highway Engineering in Special Region of Ministry of Education, Chang’an Univ ,Xi’an,Shaanxi710064,China; 2. Highway Administration Bureau of Nanyang City, Nanyang, Henan473003,China;3.Hunan Province Planning Design Institute Co., Ltd., Zhuzhou,Hunan412000,China)