Submitted on: 15 January 2003.
Revised on: 28 February 2003.
Accepted on: 09 March 2003.
Studia Geotechnica et Mechanica
http://reply.papertrans.cn/3/289/28807/28807-12.png
http://reply.papertrans.cn/3/289/28807/28807-13.png
Submitted on: 14 January 2010.
Revised on: 10 February 2010.
Accepted on: 15 February 2010.
Studia Geotechnica et Mechanica
http://reply.papertrans.cn/3/289/28807/28807-15.png
Submitted on: 23 July 2012.
Revised on: 04 August 2012.
Accepted on: 12 August 2012.
Studia Geotechnica et Mechanica
http://reply.papertrans.cn/3/289/28807/28807-17.png
http://reply.papertrans.cn/3/289/28807/28807-18.png
http://reply.papertrans.cn/3/289/28807/28807-19.png
http://reply.papertrans.cn/3/289/28807/28807-20.png