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加筋技术作为20世纪一项重大发明,广泛运用于挡土墙、堤坝、桥台、护坡等工程中。加筋技术的快速发展推动了加筋材料的快速演变,催生了土工织物、土工格栅、土工格室等一大批土工合成材料,但加筋材料有一弱点:即筋材与填料间容易出现潜在破坏面。过去填料使用的是黏土、砂土,其强度都比较稳定,时间对其强度的影响极小。对于灰土这一类材料,其强度受时间影响较大,是否适于作为加筋土填料需进行研究。选取聚丙烯纤维作为加筋材料,研究了聚丙烯纤维加筋灰土的强度与变形特性。试验中,将3种不同百分比(0.05%,0.15%和0.25%)的聚丙烯纤维分别掺入到灰土比为1:9,2:8,3:7的灰土试样中,配制试样。通过三轴试验研究了不同纤维加筋率、不同灰土比、不同龄期及不同围压对加筋灰土的影响。试验结果表明:与普通的灰土相比,聚丙烯纤维加筋灰土其峰值偏应力和抗剪强度均有不同幅度提高。
As a major invention of the 20th century, reinforced technology is widely used in retaining walls, dams, abutments, slope protection and other projects. The rapid development of reinforcement technology has promoted the rapid evolution of reinforced materials and spawned a large number of geosynthetics such as geotextile, geogrid and geocell, but there is a weakness in reinforcement materials: there is a potential for reinforcement material and packing to appear easily Destroy the surface. In the past, fillers used were clay and sand with relatively stable strength and minimal impact on strength. For limestone, the strength of this kind of material is greatly influenced by time, so it is necessary to study whether it is suitable as a filler of reinforced soil. Polypropylene fiber was chosen as the reinforcement material to study the strength and deformation characteristics of polypropylene fiber reinforced lime soil. In the test, three kinds of polypropylene fibers with different percentages (0.05%, 0.15% and 0.25%) were respectively incorporated into the lime soil samples with the lime to soil ratio of 1: 9, 2: 8 and 3: 7 to prepare the samples. The effects of different fiber reinforcement rates, different lime-soil ratios, different ages and different confining pressures on the reinforced lime soil were studied by triaxial tests. The experimental results show that the peak deviatoric stress and shear strength of polypropylene fiber reinforced ash are different from those of ordinary limestone.