| In this article, a lot of soil samples have been obtained within 20 meters deepunder ground surface to make cemented soil samples and research their mechanicalactions and rules in order to provide reference for designments and constructions usedto soil mixed wall in Tianjin.There are several experimentations including cubicstrength, prismatic strength and the whole curve of stress-strain in theexperimentation office through which the author concludes the rules between cubicstrength or prismatic strength and cure time or water-cement ratio and the relationshipbetween cubic strength and prismatic strength. The author has acquired modulus ofdeformation through the experimentation on the whole curve of stress-strain andunderstand the relationship between stress and strain thoroughly and damaged patternof cemented soil and compared and contrasted different kinds of cemented soil withthe same water-cement ratio and cure time in cubic strength and modulus ofdeformation to concluded some rules.In the second part, A DM column with different length was studied with avertical load in order to find out transfer mechanism of load, subsiding rule anddamaged pattern of itself. Transfer and subsiding rules of axial stress and friction wereconcluded to different DM columns. It concluded that when the length of a DMcolumn reached a certain number, critical length of column lc appeared. Most of axialstress , friction in side of column and deformation existed in 0～lc and others werelittle out of lc. Axial stress out of lc was counterpoised by friction in side andresistance in bottom of column.A DM column with more length of lc plays the role ofcontrolling subside and bearing capacity inefficiently, which will be damaged inshallow place because of small maximum strength. On the contrary, a column withless length of lc plays the role effectively with a big load, which will be damagedbecause friction in side and resistance in bottom of column reach maximum. |
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