洗砂泥浆压滤脱水性能及快速检测方法

doi:10.16285/j.rsm.2021.0895

岩土力学 ›› 2022, Vol. 43 ›› Issue (3): 769-776.doi: 10.16285/j.rsm.2021.0895

洗砂泥浆压滤脱水性能及快速检测方法

詹良通^{1, 2}，尹昭宇^{1, 2}，陈萍³，王顺玉^{1, 2}，陈为武⁴，蒋建良⁵，管仁秋⁵

1. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310058；2. 浙江大学岩土工程研究所，浙江杭州 310058；3. 浙江理工大学建筑工程学院，浙江杭州310018；4. 深圳市华威环保建材有限公司，广东深圳 518000；5. 浙江省工程勘察设计院集团有限公司，浙江宁波 315012

收稿日期:2021-06-15 修回日期:2021-12-17 出版日期:2022-03-22 发布日期:2022-03-22
作者简介:詹良通，男，1972年生，博士，教授，主要从事非饱和土力学与环境岩土工程的教学和科研。
基金资助:
浙江省重点研发计划项目（No.2019C03107）

Pressure filtration dewatering performance of sand-washing slurry and rapid test method

ZHAN Liang-tong^{1, 2}, YIN Zhao-yu^{1, 2}, CHEN Ping³, WANG Shun-yu^{1, 2}, CHEN Wei-wu⁴, JIANG Jian-liang⁵, GUAN Ren-qiu⁵

1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China; 4. Shenzhen Huawei Green Building Material Co., Ltd., Shenzhen, Guangdong 518000, China; 5. Zhejiang Engineering Survey and Design Institute Group Co., Ltd., Ningbo, Zhejiang 315012, China

Received:2021-06-15 Revised:2021-12-17 Online:2022-03-22 Published:2022-03-22
Supported by:
This work was supported by Key Research and Development program of Zhejiang Province (2019C03107).

摘要/Abstract

摘要： 工程渣土在水洗砂过程中产生的洗砂泥浆存在脱水效果差、不稳定的问题，这与泥浆的脱水性能密切相关。通过模拟现场洗砂工艺获得不同脱水性能的洗砂泥浆，开展了改进滤失试验及模拟压滤试验，研究了洗砂泥浆脱水性能受洗砂工艺的影响规律，获得了一种能够快速表征泥浆脱水性能的指标，用以指导优化渣土洗砂工艺。结果表明：洗砂泥浆脱水性能受洗砂粒径和加水量影响明显，滤失量及渗透系数与脱水性能有较好的相关关系；而30 min滤失量与最终滤失量、最终泥饼含水率呈现较好的相关性，能够较准确地反映泥浆脱水性能；经模拟压滤试验进一步验证，30 min滤失量可以作为洗砂泥浆脱水性能的快速表征指标。基于此提出了一套洗砂泥浆脱水性能的快速检测及工程渣土洗砂工艺优化方法，能够及时为洗砂工艺参数调整提供指导，以获得脱水性能较优的洗砂泥浆，最终使脱水效果得以改善和稳定。

关键词: 洗砂泥浆, 压滤试验, 泥饼, 滤失量, 脱水性能

Abstract: The slurry produced by sand-washing engineering of excavated soil has the problems of poor dewatering property and instability, which are closely related to the dewatering performance of slurry. In this study, sand-washing slurry samples with different dewatering performances were obtained by simulating the field sand-washing process, then the modified filtration loss test and simulated pressure filtration test were carried out to study the influence of sand-washing process on the dewatering performance of sand-washing slurries, so as to find an index for rapid characterization of the dewatering performance of slurries, which can be used to guide the optimization of the sand-washing process. The results show that the dewatering performance of sand-washing slurry was significantly affected by the mesh size and the amount of water added. The filtration loss and hydraulic conductivity indicated a good correlation with the dewatering performance. In particular, the filtration loss at 30 minutes was nicely correlated with the final filtration loss and the final water content of filter cake, which can accurately reflect the dewatering performance. The results of simulated pressure filtration test further verify that the filtration loss at 30 minutes can be used as an index to quickly characterize the dewatering performance of slurries. Based on the above results, a method is put forward for rapid detection of sand-washing slurry dewatering and optimization of field sand-washing process. The method can provide guidance for the adjustment of sand-washing process parameters in time to obtain the sand-washing slurry with better dewatering performance, which can effectively improve and stabilize the dewatering effect.

Key words: sand-washing slurry, filter test, filter cake, filtration loss, dewatering performance

中图分类号:

TU411

詹良通, 尹昭宇, 陈萍, 王顺玉, 陈为武, 蒋建良, 管仁秋, . 洗砂泥浆压滤脱水性能及快速检测方法[J]. 岩土力学, 2022, 43(3): 769-776.

ZHAN Liang-tong, YIN Zhao-yu, CHEN Ping, WANG Shun-yu, CHEN Wei-wu, JIANG Jian-liang, GUAN Ren-qiu. Pressure filtration dewatering performance of sand-washing slurry and rapid test method[J]. Rock and Soil Mechanics, 2022, 43(3): 769-776.

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洗砂泥浆压滤脱水性能及快速检测方法

Pressure filtration dewatering performance of sand-washing slurry and rapid test method

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