Constant suction direct shear test enables the understanding of failure mechanism in rainfallinduced landslides. It can be conducted using a conventional apparatus with some modifications. The constant is carried out two stages. In first stage, unsaturated soil specimen consolidated to target net normal stress and matric then sheared second stage. Matric usually controlled axis-translation prin...

It is well known that geomembranes frequently and easily fail at the seams, which has been a ubiquitous problem in various applications. To avoid failure of geomembrane photocuring was carried out with 1~5% photoinitiator 2% carbon black powder. This can be sprayed cured on soil surface. The obtained then used as barrier, separator, or reinforcement. In this study, direct shear tests were aim t...

The present study describes entrainment characteristics of bed material into debris flow, based on flume tests, numerical and dimensional analyses. Flume tests are conducted to investigate influences of bed sediment size on erosion rate by supplying debris flows having unsaturated sediment concentration over erodible beds. Experimental results show that the erosion rate decreases monotonically ...

Natural rock joints infilled with soil materials may show a reduced shear strength, which influences rock mass stability. The aim of this paper is to experimentally investigate the shear behaviour of infilled rock joints, taking into account joint surface characteristics and the properties of the joint and infill materials. A new model for predicting the shear strength of infilled joints is pre...