麦秸秆加筋石灰土抗剪强度影响因素灰色关联度分析  

Grey Correlation Analysis of the Influencing Factors of Shear Strength of Wheat Straw Reinforced Limestone Soil

作　　者：李敏[1] 柴寿喜[2] 杜红普[3] 

机构地区：[1]西部灾害与环境力学教育部重点实验室(兰州大学),兰州730000 [2]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384 [3]河北工业大学土木工程学院,天津300401

出　　处：《路基工程》2011年第4期82-86,共5页Subgrade Engineering

基　　金：国家自然科学基金(40772166);天津市自然科学基金(07JCYBJC12900)

摘　　要：为增强石灰固化滨海盐渍土的强度、塑性和抗变形能力,进行了麦秸秆加筋辅助处理的试验。试验分析结果表明:①麦秸秆加筋作用主要提高土的粘聚力,对内摩擦角的影响很小。②适宜的麦秸秆加筋长度为20 mm,约为试样直径的1/3;适宜的加筋率为0.25%。③养护初期麦秸秆加筋作用较强,养护后期,土的强度提高主要依赖石灰的固化作用。④灰色关联度理论分析认为,对加筋土的粘聚力影响程度依次为固化作用、加筋率、加筋长度;对内摩擦角影响程度依次为固化作用、加筋长度、加筋率。固化作用是影响加筋土强度的主要指标。麦秸秆与石灰共同加筋固化,拓宽了盐渍土的处理方法,丰富了加筋材料的种类。In order to increase the strength,plasticity and deformation resistance of lime-solidified costal saline soil,reinforcement test with wheat straw is carried out.The test results show that： ①wheat straw reinforcement is mainly to increase the cohesion of soil,with little influence on inner frictional angle.② The appropriate reinforcement length is 20 mm,about 1/3 of sample diameter and the appropriate reinforcement rate is 0.25%.③ In early stage of curing,wheat straw has stronger reinforcing effect;in the later period of curing,soil strength is mainly increased by solidification of lime.④ It is considered through grey correlation analysis that the effect degree on the cohesion of reinforced soil is as follows： solidification reinforcement rate reinforcement length,and that on the inner frictional angle is： solidification reinforcement length reinforcement rate.Solidification is the major influencing factor of reinforced soil strength.Wheat straw reinforcement and lime solidification broadened the treatment method of saline soil and enriched the categories of reinforcing material.

关 键 词：麦秸秆加筋石灰土 加筋条件 抗剪强度 灰色关联度分析 滨海氯盐渍土 

分 类 号：TU448[建筑科学—岩土工程]