稻秸秆加筋土力学特性与植生性能试验研究

Mechanical Properties and Plant-growing of Rice Straw Reinforced Soil

农作物秸秆是一种废弃资源,储量丰富,将其作为一种加筋材料用于土体加固前景广泛。通过室内试验对不同秸秆掺量、养护龄期和防腐处理条件下稻秸秆加筋土无侧限抗压强度、水稳定性和植生性能进行系统研究。试验结果表明,在研究范围内,稻秸秆对加筋土宏观性能影响显著。随秸秆加入以及掺量增加,加筋土抗压强度呈现先增加再减小的变化趋势,最佳掺量为0.3%;加筋土崩解速率、崩解量减小,崩解时间变长,水稳性显著提高,秸秆掺量变化对水稳性影响规律不明显;加筋土植物发芽率、生长高度和覆盖率也均显著提高。随养护龄期增加,加筋土抗压强度也先增加再减小,并且加筋土崩解曲线向右向下移动,水稳性显著提高,最佳龄期为7d。浸胶秸秆加筋土的抗压强度和水稳性均优于天然秸秆加筋土;浸胶防腐处理对植物萌发和生长无不利影响,并且浸胶防腐处理会延缓秸秆对植物生长的促进作用。稻秸秆加筋土通过土粒-秸秆作用力和秸秆自身强度和韧性实现较好的加筋效果,与秸秆掺量、养护龄期和防腐处理等密切相关。

Crop straw is a discarded resource with abundant reserves,and its use for soil reinforcement has a wide prospect.A systematic study of the unconfined compressive strength,water stability and plant-growing of reinforced soil under different straw content,curing age and anticorrosive treatment conditions was carried out.The results showed that rice straw had a significant effect on the macroscopic properties of reinforced soils.With increasing straw content,the compressive strength of reinforced soil showed a trend of increasing and then decreasing,and the optimal straw content was 0.3%.The disintegration rate and disintegration amount of reinforced soil decreased.The disintegration time became longer,and the water stability was significantly improved.The change of straw content did not have a significant effect on the water stability,the germination rate,growth height and coverage of plants of the reinforced soil were also significantly improved.With the increase of curing age,the compressive strength of the reinforced soil increased and then decreased.The disintegration curve of the reinforced soil moved to the right and downward,and the water stability was significantly improved,and the optimal curing age was 7 d.The compressive strength and water stability of the anticorrosive straw reinforced soil was better than that of the natural straw reinforced soil.The anticorrosive straw had no unfavorable impact on the germination and growth of the plants and the anticorrosive straw would delay of the growth of the plants.Rice straw reinforced soil can realize better reinforcing effect through the soil-straw forces and straw's own strength and toughness,which is closely related to the straw content,curing age and the anticorrosive treatment conditions.