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针对花岗岩残积土边坡生态防护采用的稻秸秆加筋土,通过室温与模拟日照条件下的加筋土开裂试验研究稻秸秆加筋率对土体开裂性能的影响规律,结果表明:室温条件下稻秸秆加筋率为0.3%,0.4%和0.5%的试样均未发生开裂;模拟日照条件下加筋土试样开裂过程按裂缝宽度发展速度可分为缓慢发展Ⅰ、快速发展Ⅱ、缓慢发展Ⅲ和稳定发展Ⅳ4个阶段,快速发展阶段加筋率0%,0.4%,0.5%的试样均完成70%以上的裂缝开裂宽度,加筋土样含水率呈现出快—慢—快—慢的变化过程,而裂缝宽度呈现快—慢—稳定的变化过程,稻秸秆对试样具有保湿作用,但加筋率过多会导致土样中的空隙增大,为水分蒸发提供通道;稻秸秆加筋土开裂的界限加筋率应为0.3%,其结果可为稻秸秆加筋土生态防护设计提供借鉴。
According to the straw-reinforced straw soil used for the ecological protection of granite residual soil slope, the influence law of the reinforcement ratio of straw on the cracking performance of soil was studied through the cracking test of reinforced soil under room temperature and simulated sunshine conditions. The results showed that under the condition of room temperature Cracking of rice straw at 0.3%, 0.4% and 0.5% did not occur. Cracking of the samples at the crazing depth under simulated sunshine conditions could be divided into slow development Ⅰ, rapid development Ⅱ, slow Development Ⅲ and stable development Ⅳ four stages, the rapid development stage reinforcement rate of 0%, 0.4%, 0.5% of the specimens are completed more than 70% of the crack width, reinforced soil samples showed a fast - slow - fast - But the width of the crack shows a fast-slow-steady change process. Rice straw has a moisturizing effect on the sample, but too much reinforcement ratio will lead to the increase of voids in the soil sample and provide a channel for water evaporation. The limit reinforcement ratio of straw reinforced earth cracking should be 0.3%, and the result can provide reference for the ecological protection design of rice straw reinforced soil.