论文部分内容阅读
边坡生态防护中,纤维丝能够对人工植生土起到加筋补强作用,提高植生土抗剪强度、抗侵蚀能力。本试验采用应力控制式直接剪切仪进行快剪试验,测定了不同纤维丝含量和含水率对纤维丝植生土抗剪强度的影响。试验处理采用4种纤维丝含量(0kg/m3、1.0kg/m3、2.0kg/m3、3.0kg/m3)和5种土壤质量含水率(0.30、0.35、0.40、0.45、饱和含水率)水平。试验结果显示,纤维丝可明显增强植生土的抗剪切强度,并随着纤维丝含量增加,植生土粘聚力和内摩擦角都呈先增大之后有所减小的趋势;当纤维丝量为2.0kg/m3左右时植生土获得最大抗剪强度,此时纤维丝植生土强度参数粘聚力c和内摩擦角φ分别增大2.26倍和1.55倍。随含水率增加,纤维丝植生土抗剪强度均呈减小趋势,但粘聚力和内摩擦角减小幅度不尽相同;分析结果显示,纤维丝能够明显延缓植生土粘聚力的降低,并保证在饱和含水率下内摩擦角不为零。
In ecological protection of slope, fiber yarn can play a reinforcing and reinforcing role on artificial plantation soil, and improve the shear strength and anti-erosion ability of plantation soil. In this experiment, the stress-controlled direct shearing instrument was used to conduct the quick shear test, and the influence of different fiber content and water content on the shear strength of fiber-grafted soil was measured. Four kinds of fiber content (0kg / m3, 1.0kg / m3, 2.0kg / m3, 3.0kg / m3) and five soil moisture content (0.30,0.35,0.40,0.45, saturated water content) were used in the experiment. The experimental results show that the fiber shear strength can significantly increase the shear strength of the earthen soil, and with the increase of the fiber content, the cohesion and internal friction angle of the earthen soil increase first and then decrease. When the fiber filament When the amount of 2.0kg / m3 or so, the maximum shear strength of the plantation soil was obtained. At this time, the cohesion c and the internal friction angle φ of soil fiber strength increased by 2.26 and 1.55 times, respectively. With the increase of water content, the shearing strength of fiber-grafted soil decreased, but the decreasing range of cohesion and internal friction angle were different. The analysis showed that the fiber filaments could delay the decrease of cohesion, And to ensure that the saturated water content under the friction angle is not zero.