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Being strength of revised formation of the back-filling sand due to the chemical feeding which prevents the suction of the back-filling sand of structure
Being strength of revised formation of the back-filling sand due to the chemical feeding which prevents the suction of the back-filling sand of structure
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机译:由于化学进料,防止了结构的回填砂被吸出,从而成为回填砂的改良形成强度
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摘要
PROBLEM TO BE SOLVED: To provide a method of determining the strength and the layer thickness of an improved layer of a back filling sand by chemical injection which can prevent the back filling sand from being sucked by forming the improved layer suitable for a construction site.;SOLUTION: The back filling sand 5 to be improved is collected from the construction site, the concentration of the chemical to be injected is changed, and an improved layer sample S is manufactured under a predetermined restraint pressure. Data on a relation between the concentration of the chemical and a strength q is acquired by using the improved layer sample S. A variable hydraulic pressure P is given to the improved layer sample S until it is ruptured under predetermined conditions while changing the layer thickness h for each chemical concentration to acquire data on the relation between the layer thickness h and the number of times N or a time t at which the improved layer sample is ruptured. Based on data on both relations acquired, the strength q and the layer thickness H (=h) fulfilling the requirement requested at the construction site are selected.;COPYRIGHT: (C)2007,JPO&INPIT
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