Laboratory;
of;
Highway;
Construction;
and;
Maintenance;
Technology;
in;
Loess;
Region,;
Shanxi;
Transportation;
Research;
Institute,;
Taiyuan;
030006,;
China;
of;
Geotechnical;
and;
Underground;
Engineering,;
Huazhong;
University;
of;
Science;
and;
Technology,;
Wuhan;
430074,;
China;