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《Journal of Jilin University(Earth Science Edition)》 2011-03
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Effect of Reinforcement Condition and Water Content on Compressive Strength and Stress-Strain of Compaction Soil with Wheat Straw

WANG Sheng-xin1,CHAI Shou-xi2,WANG Xiao-yan3 1.Geological Hazards Research and Prevention Institute,Gansu Academy of Sciences,Lanzhou 730000,China 2.Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin Institute of Urban Construction,Tianjin 300384,China 3.Institute of Investigation,China Water Resources,Beifang Investigation,Design and Research Co.Ltd.,Tianjin 300222,China  
Inferior strength and more deformation resulted from salt expansion,dissolution and water absorption,are overcome by means of reinforcement with wheat straw.Reinforced ratio,reinforced length and water content of soil influence the compressive strength of heavy compaction specimen and its stress-strain.It has been proved that(1)compressive strength of reinforced soil with 0.25% ratio is the best,those with 0.2% and 0.3% are better,peak of stress-strain curve of reinforced soil with 0.25% is remarkable;(2)effect of reinforced ratio on stress-strain is more and more weaker with the increase of reinforced length;(3)type of stress-strain curve changes gradually from strain softening to strain hardening with the increase of reinforced length,in which that with 70 mm is obvious;and(4)there is a peak in stress-strain curve of reinforced soils below optimum water content,and that above optimum water content display gently plasticity.Analysis on regulation of unconfined compressive strength and stress-strain will provide some directions for studying triaxial shear strength of reinforced soils with wheat straw and its deviator stress-strain in next stage.
【Fund】: 天津市自然科学基金项目(07JCYBJC12900);; 国家自然科学基金项目(40772166);; 甘肃省科学院基金项目(2008YS-JK-15)
【CateGory Index】: TU431
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