[Sustainable Civil Infrastructures] New Developments in Soil Characterization and Soil Stability (Proceedings of the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, held on July 23 to 25, 2018 in HangZhou, China) || Utilizing Secant Pile Walls as Retaining Structures and Bridge Abutments