首页|Influences of different modifiers on the disintegration of improved granite residual soil under wet and dry cycles
Influences of different modifiers on the disintegration of improved granite residual soil under wet and dry cycles
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NETL
NSTL
万方数据
维普
The disintegration of granite residual soil is especially affected by variations in physical and chemical properties.Serious geologic hazards or engineering problems are closely related to the disintegration of granite residual soil in certain areas.Research on the mechanical properties and controlling mecha-nisms of disintegration has become a hot issue in practical engineering.In this paper,the disintegration characteristics of improved granite residual soil are studied by using a wet and dry cycle disintegration instrument,and the improvement mechanism is analyzed.The results show that the disintegration amounts and disintegration ratios of soil samples treated with different curing agents are obviously dif-ferent.The disintegration process of improved granite residual soil can be roughly divided into 5 stages:the forcible water intrusion stage,microcrack and fissure development stage,curing and strengthening stage,stable stage,and sudden disintegration stage.The disintegration of granite residual soil is caused by the weakening of the cementation between soil particles under the action of water.When the disin-tegration force is greater than the anti-disintegration force of soil,the soil will disintegrate.Cement and lime mainly rely on ion exchange agglomeration,the inclusion effect of curing agents on soil particles,the hard coagulation reaction and carbonation to strengthen granite residual soil.Kaolinite mainly depends on the reversibility of its own cementation to improve and strengthen granite residual soil.The reversibil-ity of kaolinite cementation is verified by investigating pure kaolinite with a tensile,soaking,drying and tensile test cycle.Research on the disintegration characteristics and disintegration mechanism of improved granite residual soil is of certain reference value for soil modification.
Granite residual soilDisintegrationWet and dry cycleMechanismImproved soil
NETL
NSTL
万方数据
维普
