加筋稻草与麦秸秆的吸水性及拉伸性能实验研究

以稻草和麦秸秆加筋滨海盐渍土,可提高土的强度和抗变形能力。使用SH胶对稻草和麦秸秆进行防腐处理,完成了防腐前后的吸水实验和极限拉伸实验。对比实验结果得知:① 天然和浸胶稻草的吸水率均比麦秸秆的大;② 浸胶提高了稻草与麦秸秆的极限拉力和极限延伸率;③ 浸胶稻草的吸水率的降低率、极限延伸率的增长率和极限拉力的增长率均低于浸胶麦秸秆的;④ 天然、浸海水、浸胶、浸胶后再浸海水稻草的极限延伸率和极限拉力均高于相应麦秸秆的。稻草和麦秸秆均适宜作加筋材料使用。应用在加筋土中,稻草比麦秸秆具有更良好的抗拉性能及协调土的变形能力。在浸胶后的防腐效果及其增强抗拉性能上,麦秸秆优于稻草。

Experimental Investigation of Water Absorption and Tensile Properties of Rice Straw and Wheat Straw Used for Reinforced Material

Reinforcement with rice straw and wheat straw can deal with some problems resulted from lower strength and much deformation of saline soil in inshore. Water absorption and tensile properties of rice straws and wheat straws before and after soaking in SH agent were carried out. The results are as follows: (i) Water absorption of rice straw is more than that of wheat straw in the condition of soaking in seawater and soaking in seawater after SH agent; (ii) Maximum tension and elongation of rice straw and wheat straw soaked in SH agent all increases; (iii) Both decreasing rate of water absorption and increasing rate of maximum tension and elongation of rice straw soaked in seawater after SH agent is less than those of wheat straw; (iv) Maximum tension and elongation of rice straw is always more than those of wheat straw in the condition of original, soaking in seawater, soaking in SH agent, and soaking in seawater after SH agent. Both rice straw and wheat straw are suitable for reinforced material. The tensile properties and reinforcement function of rice straw in soil is better than wheat straw, while the anti-decay effect and tensile properties of wheat straw after soaking in SH agent is better than rice straw.