柔性纤维加筋土抗剪特性研究

Studies on anti-shearing feature of flexible fiber reinforced soil

植被护坡抗水流冲刷稳定性研究由来已久,基于植物根系可增加土壤抗剪强度的理论,认为不同根土复合体的抗剪强度不同,其抗水流冲刷能力亦不同。通过室内直接快剪试验,研究了黏性土、ABS塑料及聚丙烯纤维两种柔性加筋材料不同含量下加筋土体的抗剪特性。试验结果表明,土体加筋后,改变了原有土体的物理力学性质,其黏聚力存在一定程度的减小而内摩擦角却有所增大,其变化趋势存在一定的规律性。研究成果对下一步加筋土抗水流冲刷试验提供了数据基础。

Studies on stability of scouring resistance of vegetation revetment have been emerged for a long period of time. According to the theories that plant root system can increase the anti-shearing intensity, the capabilities of scouring resistance of various root-soil composites can be different. A direct shear experiment was conducted for examining the anti-shearing features of two types of flexible fiber reinforced soil with clay, ABS plastics and polypropylene fiber. It is found that the cohesion of reinforced soil decreased but friction of internal angle in- creased because of the change of physico-mechanical properties of original soil, and its change tendency was dominated by regularity. The study result provides a data base for the nest-step anti-shearing experiment of re- irrforced soil.