TECHNIQUE OF DIKE BUILDING BY SILT SQUEEZING BLASTING AND ITS APPLICATION

摘要

This paper introduces the mechanism and the operating process of dike building by silt squeezing blasting. DBSSB (dike building by silt squeezing blasting) has the following advantages: shorter construction period (the construction period is decided only by the speed of rock materials filling) greater consolidation of the body of the dike, more structural stability, smaller settlement. Therefore by conventional standards the same dike can be designed with a smaller cross section than other construction methods, and at a reduced cost when enough rock materials can be provided in site. The engineering quality obtained and the safety technique used in the project of building dike to reclaim land for storing ore in Majishan are presented in this paper. The data of dike core from the hole drilling illustrated that the bottom of dike body has satisfied the design requirement in which the mixed layer consisted of rock and mud should not be over 1m. The largest settlement amount in the period of construction was only 80mm(30.5in) so far, smaller than 500mm(19.7in) resulted from sand piling method. The peak value of particle vibration velocity on the land stage of transporting trestle was not over 1.67cm/s(0.66in/s). The value is below the allowable value 3.5cm/s(1.38in/s). The pressure peak value of shock wave in water was not over 0.12MPa, less than the allowable value 0.2MPa.