麦秸秆加筋土的轻型击实试验与击实土的抗压性能  

Light Compaction Test of Saline Soil Reinforced with Wheat Straw and Compressive Property of Compacted Specimen

作　　者：王沛[1] 柴寿喜[1] 仲晓梅[1] 杨宝珠[1] 

机构地区：[1]天津城市建设学院地质与测绘学院,天津300384

出　　处：《长江科学院院报》2012年第5期26-31,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金(41140024);天津市高等学校科技发展基金(20090901;SB20080083)

摘　　要：以防腐处理后的麦秸秆加筋盐渍土,解决土的盐胀、溶陷和吸湿软化所引起的低强度和大变形问题。盐渍土、麦秸秆加筋盐渍土的轻型击实试验和击实加筋土的抗压强度试验结果表明:①随加筋长度和加筋率的增加,最优含水率变化较小,最大干密度有所降低;②加筋麦秸秆使土的抗压强度和抗变形能力提高,30 mm和0.25%为直径102 mm试样的适宜加筋长度和加筋率;③与盐渍土一样,低于最优含水率,加筋土的应力应变曲线显示为应变软化;高于最优含水率,表现为应变硬化;④应变较小时,应力应变曲线相互靠近;随应变的增加,曲线的间距逐渐增大。这表明,只有在发生较大应变时,加筋作用才能发挥出来。麦秸秆加筋盐渍土的轻型击实性能较好;加筋麦秸秆提高了盐渍土的抗压强度和抗变形能力。Low strength and large deformation resulted from salt heaving,salt dissolution and water absorption of saline soil could be treated by reinforcement with anti-corrosive wheat straw.Light compaction test and compressive strength test on saline soil and reinforced saline soil with wheat straw shows that： first of all,with the increase of wheat straw length and reinforcement ratio,the optimum water content hardly decreases,and the maximum dry density increases slightly.Second,the compressive strength and deformation resistance of soil is improved by reinforcement with wheat straw.A wheat straw length of 30 mm and reinforcement ratio of 0.25% are suitable for samples of 102 mm in diameter.Moreover,the stress-strain curves of reinforced soil are of strain softening when water content is less than the optimum value,and of strain hardening when larger than the optimum value,which are the same as that of saline soil.Finally,in small strain section,the stress-strain curves are close to each other,while in large strain section,the distance grow larger,which suggests that the reinforcement only functions with large strain in the soil.It＇s proved that reinforcement with wheat straw improves the compressive strength and deformation resistance of saline soil,and the reinforced soil has a good compaction effect for filling road embankment.

关 键 词：轻型击实试验 加筋盐渍土 抗压强度 轴向应力应变 

分 类 号：TU411[建筑科学—岩土工程]