A study of influence of water content and reinforcement ratio on the shear strength of reinforced soil
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摘要: 研究含水率和加筋率对稻秸秆加筋土的强度影响问题，对促进稻秸秆加筋土在边坡生态防护中的推广应用具有重要作用。针对边坡生态防护所采用的稻秸秆加筋土，通过直剪试验研究不同加筋率与含水率条件下加筋土抗剪强度的变化规律。试验通过加水法和烘干法改变6种加筋率（加筋率为：0~0.5%）试样的含水率，然后进行室内直剪试验。结果表明：（1）不同加筋率条件下加水法所得加筋土试样的抗剪强度、粘聚力与内摩擦角均随含水率的增加先增大后减小，并在土体最优含水率14.8%时出现峰值，而烘干法所得加筋土试样的抗剪强度、粘聚力与内摩擦角则随含水率的增加而逐渐减小；（2）加水法与烘干法所得抗剪强度、粘聚力与内摩擦角受含水率的影响均存在临界值，约为19%;（3）在增长率相同的条件下含水率对加筋土抗剪性能的影响大于加筋率。Abstract: It is important to study the effect of water content and reinforcement rate on the strength of rice straw-reinforced soil, which has an important effect on promoting the application of rice straw-reinforced soil in slope ecological protection. The moisture content of the six kinds of reinforcement ratios (0 to 0.5%) was changed by adding water and with the drying method, and the indoor direct shear tests were carried out. The result shows that (1) the shearing strength, cohesive force and internal friction angle of the reinforced soil samples, which are obtained by the adding water method, increase first and then decrease with the increasing water content under different rates of reinforcement. When the water content is 14.8%, their peak values appear. The shearing strength, cohesive force and internal friction angle of the reinforced soil samples, which are obtained by the drying method, decrease gradually with the increasing water content. (2) The shear strength, cohesive force and friction angle, which are obtained by adding water and with drying method, all have a critical value of moisture content, which is about 19%. (3) Under the same growth rate, the effect of moisture contents on the shear strength of the reinforced soil is greater than the reinforcement ratio.
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