稻草加筋土和麦秸秆加筋土的无侧限抗压强度比较

为解决因溶陷和盐胀引起土的强度降低问题,分别采用稻草和麦秸秆加筋滨海盐渍土,以提高其抗压性能.选择加筋长度、质量加筋率、筋材形状及防腐处理作为影响因素,比较稻草加筋土和麦秸秆加筋土的无侧限抗压强度.试验结果为:①天然稻草加筋土和防腐稻草加筋土的无侧限抗压强度相应地高于天然麦秸秆加筋土和防腐麦秸秆加筋土,两种加筋土的无侧限抗压强度均高于盐渍土.②稻草的适宜加筋条件为:加筋长度为15,mm,质量加筋率为0.20%;麦秸秆的适宜加筋条件为:加筋长度为10,mm或15,mm,质量加筋率为0.20%或0.25%.③就稻草和麦秸秆的形状而言,二分之一状优于圆管状,四分之一状优于二分之一状.④为提高加筋土的强度和耐久性,稻草和麦秸秆在用作加筋之前,需对其进行防腐处理.稻草和麦秸秆均适宜作加筋材料,稻草加筋优于麦秸秆加筋,两者均可用于加筋滨海盐渍土.

Unconfined Compressive Strength Comparison between Saline Soils Reinforced with Rice Straw and with Wheat Straw

In order to increase the compressive characteristic of saline soil, saline soils reinforced with rice straw and with wheat straw were used to solve the problem of soil strength decrease due to salt expansion and dissolution. And then the unconfined compressive strengths of the saline soils reinforced with rice straw and with wheat straw were compared by selecting reinforced length, reinforced quality ratio, shapes, anticorrosive processing as influence factors. Test results show that： ①Unconfined compressive strength of the saline soil reinforced with natural rice straw and with antiseptic rice straw is higher than the saline soil reinforced with natural wheat straw and with antiseptic wheat straw; unconfined compressive strength of the two reinforced saline soils are higher than saline soil. ②The appropriate reinforcement condition office straw is as follows： reinforced length of 15 mm, reinforced quality ratio of 0.2%; the condition of wheat straw is as follows： reinforced length of 10 mm or 15 ram, reinforced quality ratio of 0.2% or 0.25%. ③As far as the shapes of rice straw and wheat straw are concerned, half tube shape is better than tubular shape, and the shape of a quarter is better than half. ④ Both rice straw and wheat straw need anti-corrosion treatment before reinforcing to improve the strength and durability of the rein- forced saline soil. Rice straw and wheat straw are suitable for reinforcement materials, rice straw reinforcement is better than that of wheat straw; both of them can be used for handling saline soil.