草本植物根系对土体加筋的效应

摘要

Through directly digging the roots of Axonopus compressus (Sw.) Beauv., Eragrostis curvula and Eleusine indica (L.) Gaertn from the wild, which would be mixed with red clay in Hainan area and made into remodeling reinforced soil complex, we analyzed the reinforcing effect of different species with different water ratio and different root ratio.The plant roots can significantly improve the soil shear strength, and the soil shear strength is larger when root ratio is increasing.The shear strength of the remolded reinforced soil increases with the decreasing of the water ratio.The cohesive force value of the remolded reinforced soil is larger when root ratio is increasing, and decreasing when the water ratio is increasing.The internal friction angle of remolded reinforced soil is improved in certain extent, but the changing is small.The reinforcing effect of remolded soil with Eragrostis curvula is better.%通过从野外直接挖取地毯草、弯叶画眉草、牛筋草根系,与海南地区红黏土随机混合制作成重塑加筋土复合体,分析不同含水率、不同含根率下,不同植物对土体的加筋效应.试验表明:植物根系能显著提高土体的抗剪强度,随着土体含根率的提高,根系土体的抗剪强度值越大;重塑根系土体的抗剪强度值随着土体含水率的降低而增加;重塑加筋土体的黏聚力随含根率增加而增加,随含水率的提高而降低;重塑加筋土体的内摩擦角有一定程度的提高,但是变化较小;弯叶画眉草重塑土体的加筋效果较好.