白泥改良膨胀土液塑限和膨胀力试验探究  

Experimental study on liquid-plastic limits and swelling pressure of expansive soil improved by paper-making white mud

作　　者：刘万林 张芹[1] 卢有谦 吴广水 于海浩[1] LIU Wanlin;ZHANG Qin;LU Youqian;WU Guangshui;YU Haihao(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Transportation Science and Technology Group,Nanning 530007,China)

机构地区：[1]广西岩土力学与工程重点实验室桂林理工大学,广西桂林541004 [2]广西交科集团有限公司,广西南宁530007

出　　处：《河南工程学院学报（自然科学版）》2023年第4期22-28,共7页Journal of Henan University of Engineering：Natural Science Edition

基　　金：广西科技基地和人才专项(桂科AD20325010)。

摘　　要：为合理处置制浆造纸厂排出的固体废料造纸白泥,将其用于膨胀土改良,研究了不同掺量的白泥对膨胀土液塑限和膨胀力的影响。结果表明:10%的白泥掺量为最优掺量,可显著降低膨胀土的液塑限和膨胀力;继续增加白泥掺量,液塑限逐渐降低直至稳定,但膨胀力反而提高。分析其原因,认为改良机制主要在于白泥中高价阳离子溶解造成黏土矿物的双电层压缩,过量的白泥改变了混合物的亲水性和孔隙结构,有利于毛细作用对水分的输送,提高了试样中黏土矿物成分的吸水速率,单位时间内会有更多黏土矿物发生膨胀,导致膨胀力在短时间内迅速上升。在实际膨胀土改良工程中需要注意,非膨胀性材料掺量并非越多越好。In order to reasonably dispose the white mud from pulp and paper mill,the white mud was used for improvement of expansive soil.The effects of different amounts of white mud on liquid-plastic limits and swelling pressure of expansive soil were studied.The results show that 10%is the optimal dosage,which can significantly reduce these two indexes.With the addition of white mud increasing,the liquid-plastic limits gradually decreases until it becomes stable,but the swelling pressure increases.According to the analysis of the reasons,the improvement mechanism is mainly due to the dissolution of high valent cations in the white mud resulting in the compression of the electrical double layer of clay minerals.The excess white mud changed the hydrophilicity and the pore structure,which was conducive to the transport of water by capillary action and thus improved the water absorption rate of clay minerals in the sample.More clay minerals expanded per unit time,resulting in a rapid increase of swelling pressure in a short time.In the actual expansive soil improvement project,attention should be paid to the fact that the more non-expansive material is not the better.

关 键 词：造纸白泥 膨胀土 改良 界限含水率 膨胀力 

分 类 号：TS7[轻工技术与工程—制浆造纸工程]