狗尾草对加筋土坯力学性能的影响

Impact of Green Bristle Grass on Mechanical Properties of Reinforced Adobe

目的研究狗尾草作为加筋材料对制作的土坯抗压强度、抗剪强度和抗折强度等力学性能的影响.方法将不同长度,不同掺量的狗尾草作为加筋材料加入到生土中,制作成相应的土坯,通过测试其抗压、抗剪和抗折强度,研究加筋材料的长度和掺量对土坯力学性能的影响.结果狗尾草的长度和掺量对土坯抗压强度影响不显著;对狗尾草长度为3～5cm和5～7cm的土坯,当狗尾草加筋率在0.5%时,土坯试件抗剪强度达到最大值,分别为42.9kPa和49.1kPa,狗尾草长度为7～10cm的土坯,加筋率在0.5%时,试件抗剪强度达到最大为58.9kPa;3个加筋长度段的土坯试件抗折强度均随加筋量的增加而增大,当加筋率达到0.7%时,抗折强度达到最大值,分别为56.3kPa,57.8kPa和58.9kPa.结论加筋草的长度和质量对土坯抗压强度影响不显著,但可以较大程度的提高土坯的抗剪和抗折强度,改善土坯的力学性能.

This study presents the impact of green bristle grass as reinforced material on the mechanical properties of adobe, such as compressive, sheering and flexural strength. Through testing the mechanical properties of adobe ,the impact of reinforced material＇s length and amount on the properties is studied. The length and amount of the grass have no clear influence on the mechanical properties of adobe. In terms of the grass with the length 3 - 5 cm and 5 - 7 cm, when the amount portion is 0. 5 %, the sheering strength of adobes achieve maximum with 42.9 kPa and 49. 1 kPa respectively. In view of the grass with the length 7 - 10 cm, when grass mass portion is 0.5% ,their sheering strength be comes best with 58.9 kPa. As the amount portion of grass rises to 0. 7% ,the flexural strength of adobes increases to 56. 3 kPa,57.8 kP and 58.9 kPa. The conclusion is that the strength and quality of grass have few impacts on the compressive strength of adobe, but it can enhance sheering and flexural strength of adobe and improve the mechanical properties of adobe.