干燥脱水过程中纤维加筋固化淤泥的强度特性

doi:10.11867/j.issn.1001-8166.2019.04.0433

地球科学进展 ›› 2019, Vol. 34 ›› Issue (4): 433 -438. doi: 10.11867/j.issn.1001-8166.2019.04.0433

王玥(

),唐朝生(

),吕超,王鹏,荣德政,王宏胜

南京大学地球科学与工程学院，江苏南京 210023

收稿日期:2018-11-16 修回日期:2019-01-27 出版日期:2019-04-10
通讯作者: 唐朝生 E-mail:wangyuenju@smail.nju.edu.cn;tangchaosheng@nju.edu.cn.;tangchaosheng@nju.edu.cn
基金资助:
国家自然科学基金面上项目“蒸发作用下黏性土水分迁移规律及工程性质响应研究”(编号：41572246);江苏省自然科学基金面上项目“水—力耦合条件下纤维加筋填土边坡变形破坏特征及稳定性评价研究”(编号：BK20171228)

Strength Characteristics of Fiber Reinforced Solidified Sludge During Drying

Yue Wang( ),Chaosheng Tang( ),Chao Lü,Peng Wang,Dezheng Rong,Hongsheng Wang

School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

Received:2018-11-16 Revised:2019-01-27 Online:2019-04-10 Published:2019-05-27
Contact: Chaosheng Tang E-mail:wangyuenju@smail.nju.edu.cn;tangchaosheng@nju.edu.cn.;tangchaosheng@nju.edu.cn
About author: Wang Yue （1995-）， female， Yancheng County， Jiangsu Province， Master student. Research areas include urban environmental geotechnical and soil improvement new technology research. E-mail： wangyuenju@smail.nju.edu.cn | Wang Yue （1995-）， female， Yancheng County， Jiangsu Province， Master student. Research areas include urban environmental geotechnical and soil improvement new technology research. E-mail： wangyuenju@smail.nju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China “Study on moisture transfer law and engineering properties response of viscous soil under evaporation”(No. 41572246);Jiangsu Natural Science Foundation Project “Fiber-forced filling edge under water-structure coupling conditions study on slope deformation and failure characteristics and stability evaluation”(No. BK20171228)

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淤泥是一种天然含水率高且力学性质极差的固体废弃物，采取有效的技术方法进行快速脱水和增强可以实现淤泥资源化和高效利用。选取离散短丝聚丙烯纤维作为加筋材料，水泥和粉煤灰作为固化材料，通过开展无侧限抗压试验，研究了纤维加筋固化淤泥在干燥路径中强度的变化，并分析了干燥过程中不同目标含水率状态(分别为45 $%$ ，40 $%$ ，35 $%$ ，30 $%$ ，25 $%$ ，20 $%$ ，15 $%$ ，10 $%$ 和5 $%$ )和纤维掺量(0~0.8 $%$ )对加筋固化淤泥强度的影响机理。结果表明： $①$ 纤维的加入能有效提高固化淤泥的峰值强度和残余强度，且强度值随纤维掺量的增加呈现先上升后下降的趋势，最优纤维掺量为0.1 $%$ ； $②$ 干燥脱水过程中，试样的无侧限抗压强度随含水率的减小近似于线性增加，破坏形式由塑性破坏逐渐向脆性破坏过渡，而纤维的加入可以有效抑制试样的脆性破坏，提升试样的韧性； $③$ 纤维加筋对固化淤泥强度的贡献随含水率的减小而逐渐增加，根本原因是纤维—淤泥界面作用力在低含水率条件下能得到更佳的激发。

关键词: 纤维加筋, 干燥脱水, 含水率, 强度, 淤泥

Sludge is a kind of solid waste with high natural moisture content and extremely poor mechanical properties. Adopting effective technical methods for rapid dewatering and increasing strength is an important prerequisite for realizing the utilization and efficient utilization of sludge resources. In this paper, discrete short-staple polypropylene fiber was selected as the reinforced material, cement and fly ash were used as the solidified materials. The unconfined compression test was carried out to study the strength change of the fiber reinforced solidified sludge in the drying path, and the drying was analyzed. The influence mechanism of different target moisture content states(5 $%$ ~45 $%$ ) and fiber content(0~0.8 $%$ ) on the strength of reinforced solidified sludge during the process. The results show that: $①$ The addition of fiber can effectively improve the peak strength and residual strength of solidified sludge, and the strength value increases first and then decreases with the increase of fiber content, and the optimal fiber content is 0.1 $%$ . $②$ During the drying process, the sample of the unconfined compressive strength increases with the decrease of the moisture content of approximate to linear, and the damage form by the plastic damage to brittle fracture transition gradually, and the addition of fibers can effectively restrain the brittle failure sample, enhance the toughness of specimen. $③$ The contribution of fiber reinforcement to the strength of solidified sludge increases gradually with the decrease of moisture content, and the root cause is that the fiber-sludge interface force can be better excited under the condition of low moisture content.

Key words: Fiber reinforcement, Drying dehydration, Water content, Strength, Sludge.

中图分类号:

表1 淤泥的物理性质指标

Table 1 Physical and mechanical behaviors of sludge

比重	天然含水率/ $%$	液限/ $%$	塑限/ $%$	有机质/ $%$
2.48	46.92	61.2	36.8	4.6

表1 淤泥的物理性质指标

Table 1 Physical and mechanical behaviors of sludge

比重	天然含水率/ $%$	液限/ $%$	塑限/ $%$	有机质/ $%$
2.48	46.92	61.2	36.8	4.6

表2 聚丙烯纤维的物理力学参数

Table 2 Physical and mechanical behaviors of

类型

密度

/(g/cm³)

直径

/mm

平均长度

/mm

耐酸碱性

分散性

束状单丝

0.91

0.020~0.048

极强

极好

表2 聚丙烯纤维的物理力学参数

Table 2 Physical and mechanical behaviors of

类型

密度

/(g/cm³)

直径

/mm

平均长度

/mm

图 1 素土样在不同含水率条件下的应力—应变曲线

Fig. 1 Stress-strain curves of samples without fiber reinforcement

图 2 纤维掺量为0.1 $%$ 时试样在不同含水率条件下的应力—应变曲线

Fig.2 Stress-strain curves of samples with 0.1 $%$ fiber reinforcement

图 2 纤维掺量为0.1 $%$ 时试样在不同含水率条件下的应力—应变曲线

Fig.2 Stress-strain curves of samples with 0.1 $%$ fiber reinforcement

图 3 不同纤维掺量下含水率与无侧限抗压强度的关系

Fig. 3 Relationship between moisture content and unconfined compressive strength under different fiber dosages

图 4 不同含水率条件下纤维掺量对固化淤泥强度的影响

Fig. 4 Effect of fiber content on the strength of solidified sludge under different moisture content

图 5 含水率对纤维加筋固化淤泥效果的影响

Fig. 5 Effect of moisture content on the effect of fiber reinforced solidified sludge

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