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为解决因滨海盐渍土的盐胀和溶陷而引起土的强度降低问题,可采用麦秸秆加筋的方法处理盐渍土,以提高土的强度和抗变形能力。将盐渍土与一定长度和数量的防腐麦秸秆均匀拌和在一起,按照一定的碾压功将其碾压密实,此时土的含水率、麦秸秆的质量加筋率和加筋长度是影响加筋土重型击实效果的3个因素。试验结果揭示,(1)加筋土的最大干密度均小于盐渍土的,最优含水率变化不大。(2)与盐渍土一样,随着含水率的增加,加筋土的干密度先升后降。(3)随质量加筋率和加筋长度的增加,加筋土的最优含水率变化不明显,最大干密度持续下降,但降幅较小。(4)0.2%质量加筋率加筋土的干密度最大,0.3%质量加筋率的最小。(5)30mm加筋长度加筋土的干密度最大,70mm加筋长度的最小。建议按0.2%质量加筋率和30mm加筋长度的防腐麦秸秆制备三轴压缩试样,以研究麦秸秆加筋滨海盐渍土的抗剪强度和应力-应变特性。
In order to solve the problem of soil strength reduction caused by salt expansion and dissolution of coastal saline soil, saline soil can be treated with wheat straw reinforcement to improve soil strength and deformation resistance. Saline soil and a certain length and quantity of wheat straw mixed evenly together, according to a certain amount of compacting compacted grind compaction, soil moisture content at this time, the quality of wheat straw reinforcement and reinforcement length is the impact Reinforced soil compaction effect of three factors. The test results reveal that (1) the maximum dry density of reinforced soil is less than that of saline soil, and the optimum moisture content does not change much. (2) Like the saline soil, the dry density of the reinforced soil first increases and then decreases with the increase of the water content. (3) With the increase of the mass reinforcement ratio and the reinforcement length, the optimum moisture content of the reinforced soil is not obvious change, the maximum dry density continues to decline, but the decline is small. (4) 0.2% mass reinforcement The reinforced soil has the highest dry density and the minimum 0.3% mass reinforcement. (5) 30mm stiffened length Reinforced soil has the highest dry density and the smallest stiffened length of 70mm. It is suggested that the triaxial compression specimens with 0.2% mass reinforcement ratio and 30mm reinforcement length should be prepared to study the shear strength and stress-strain characteristics of wheat straw reinforced coastal saline soil.