1. Relationship between sand relative density and earth pressure coefficient at-rest
Thaweesak Pitikhunpongsuk and Sittha Jitsamart

2. Effects of backfill compositions on integrity of underground salt and potash mines
Chatchita Theerapun, Supattra Khamrat, Suratwadee Sartkeaw and Kittitep Fuenkajorn

3. Simulation study on the effect of internal pressure in isrcts compared with fluid mandrel drawing method
Tanit Tangsri

4. Efficiency enhancement of biological phosphorus removal with difference carbon sources
Chatlada Piasai, Nittaya Boontian, Usa Yingchon and Htay Aung Pyae