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滨海盐渍土具有盐胀、溶陷和吸湿软化等不良工程地质问题,未经固化处理不能满足工程建设的强度和变形要求。借鉴合成纤维加筋土和草根土的研究成果,初步确定包括加筋长度、质量加筋率、加筋形状和石灰掺加量等因素的麦秸秆加筋盐渍土的加筋条件。通过抗压强度试验和Taguchi正交试验设计优化方法,确定最优加筋条件为:加筋长度为10mm、加筋率为0.25%、形状为1/4圆弧状和石灰掺加量为8%。以麦秸秆作加筋与石灰共同加筋固化滨海盐渍土,其抗压强度试验结果表明,石灰+麦秸秆加筋盐渍土的抗压强度、抗变形能力和水稳性均优于石灰土和盐渍土。初步的研究成果对今后系统研究麦秸秆加筋滨海盐渍土的抗压强度、抗剪强度和变形特性等具有指导意义。
Coastal salty soil has the problems of poor engineering geology such as salt expansion, dissolving and moisture absorption and softening. Without curing treatment, the strength and deformation of the project can not be met. Based on the research results of synthetic fiber reinforced soil and grassroots soil, the reinforcement conditions of wheat straw reinforced saline soil including the length of reinforcement, the rate of reinforcement, the shape of reinforcement and the dosage of lime were preliminarily determined. Through the compressive strength test and Taguchi orthogonal design, the optimum reinforcement conditions were determined as follows: the reinforcement length is 10mm, the reinforcement ratio is 0.25%, the shape is 1/4 arc and the lime dosage is 8 %. The results of compressive strength test showed that the compressive strength, anti-deformation ability and water stability of lime + wheat straw-reinforced saline soil were better than those of lime Soil and saline soil. The preliminary research results are of guiding significance for systematically studying the compressive strength, shear strength and deformation characteristics of wheat straw-reinforced coastal saline soil in the future.