At an international symposium held October 1991 in Emeishan City, Sichuan, China, the subjects of debris flow and flood disaster protection were addressed and the present state of the art in debris flow protection and flood control works along some of the railways in China was inspected during guided field trips by train and boat. This technical note highlights some of the many interesting aspects dealt with at the symposium.
A brief summary is given of the effect of increased strain rates on the resistance value of concrete and reinforcing steel bars. The results of two recent research projects are subsequently reviewed against this background.
It had previously been shown that the existing prediction models for the California bearing ratio (CBR) using the soil classification parameters such as grading and the Atterberg limits were unsatisfactory. This note details an investigation that examined the variation of CBR with plasticity index and percentage clay in a series of synthetic soil samples and then proposes a CBR prediction model that allows for the dilution effect of the non-plastic particles in the Atterberg limit tests by using an equivalent liquid limit based on the ratio of these particles and the clay particles. The resulting prediction equation is shown to give satisfactory results for some dolerite, granite and sandstone soil samples.