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Dear all, Please kindly advise what are the common sizes of forpole umbrella for mine tunnelling in soft ground? Thanks.

Dear all, By using estimated Q-values and empirical design chart proposed by Barton (1993), spacing of rock bolts, length of the bolts and thickness of shotcrete (unreinforced or reinforced) for ground supporting of a tunnel can be determined. My questions are: (1) How to determine size of...

Dear all, Any information on the permeability of segmental concrete lining that without gasket in the connections. Thanks.

Dear all, I am preparing a rock tunnel lining design. The tunnel is proposed to be drilled through hilly region which is far above the sea level. I think the groundwater in rock is mainly come from rainfall. As it is a preliminary design, no groundwater monitoring is carried out. I assume a...

Dear all, Why undrained strengths (or total stress approaches) instead of drained strengths (or effective stress approaches)are adopted in shoring design in CLAY? How does drained and undrained shear strength of clay affect the design of temporary or permanent sheetpile? which type of...

Dear all, I am doing a finte difference numercial analysis on a lateral loaded piles in Bangkok Clay. I have carried out undrained analysis (short term stability checking?) that allows built up of excess pore water pressure. I need to study the long term stability, My questions are as...

Dear Members, I am an asistant geotechnical engineer in hong kong. I currently carry out ground investigation study in a reclamation area. It is reavelaed that Marine Deposit (MD), which in general composes of soft, greenish gray, CLAY, overlies Alluvium. Any reasons behind for this phenomenon?

Dear all, I have a project regarding settlement analysis on reclamation region. The background of the study are: (1) Continous ground settlement was found over past 15 years. This was reviewed by records of settlement markers (nearest 5 years) and visual inspections on site. Settlement on...

I had a site formation design on a sloping ground. The marjor construction activities including: (1) installation of soldier pile 1.5m c/c (2) carrying out excavation into stages with tieback and wailing installation. The soldier piles, wailing beams and tiebacks form a rigid frame system to...