摘要
为了研究石灰、Na Cl、纤维、干密度对黏土的影响,制备不同石灰含量、不同种类纤维、不同干密度以及是否添加Na Cl的试样,进行无侧限抗压试验。结果显示:单独加入纤维比单独加入Na Cl更能有效地提高无侧限抗压强度,Na Cl与纤维共同添加提高抗压强度幅度最大。不同成分的纤维加筋土混合物无侧限抗压强度均与孔隙度/石灰含量指数成非线性关系,无侧限抗压强度随着孔隙度/石灰含量指数的减小而呈指数增加,通过回归曲线拟合了无侧限抗压强度与孔隙度/石灰含量指数的公式。比对不同组分纤维加筋土公式,与实际情况符合,R2在允许范围之类,回归性较好。孔隙度/石灰含量指数的应用表明,它可以在一定范围之内有效地预测纤维加筋土的力学性能。
In order to improve the engineering characteristics of low clay strength in Shanghai area,lime,fiber and other reinforcement materials are commonly used,but there is lack of quantitative evaluation of the improvement results. To analyze the effects of lime,NaCl,fiber and dry density on clay,samples with different lime content,different types of fiber,different dry density and with and without NaCl were prepared,unconfined compressive tests were conducted. The results show that adding fiber alone can improve the unconfined compressive strength more effectively than adding NaCl alone,and adding NaCl together with fiber can improve the unconfined compressive strength the most.The unconfined compressive strength of fiber reinforced soil mixtures of different composition has a nonlinear relationship with the porosity/lime content index( η/Liv),and the unconfined compressive strength increases exponentially as the η/Liv decreases. The formula of unconfined compressive strength and η/Liv is fitted by the regression curve,and the formula of fiber reinforced soil of different components is compared with the actual situation. R2 is within the allowable range,and the regression is good. The application of η/Liv shows that it can effectively predict the mechanical properties of fiber reinforced soil within a certain range.
作者
汪骏沣
璩继立
WANG Junfeng;QU Jili(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《水利与建筑工程学报》
2021年第5期34-39,共6页
Journal of Water Resources and Architectural Engineering
关键词
氯化钠
石灰
纤维加筋土
孔隙度
无侧限抗压强度试验
sodium chloride
lime
fiber reinforced soil
porosity
unconfined compressive strength test
