考虑封孔浆体黏度时空变化的止浆机制研究

张聪; 梁经纬; 阳军生; 张贵金; 谢亦朋; 叶新田

doi:10.11779/CJGE201905022

考虑封孔浆体黏度时空变化的止浆机制研究 English Version

1.中南大学土木工程学院,湖南长沙 410075;
2. 湖南省水利水电科学研究院,湖南长沙 410007;
3.长沙理工大学水利学院,湖南长沙 410114

基金项目: “十三五”国家重点研发计划课题（2016YFC0802504）; 湖南省自然科学基金青年基金项目（2019JJ50336）

详细信息

作者简介:
张聪(1988— ),男,博士研究生,主要从事基础处理及地下工程等科研工作。E-mail：zc8023cl@163.com。

中图分类号: TU41
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出版历程
- 收稿日期: 2017-09-12
- 发布日期: 2019-05-24

Sealing mechanism of slurry materials considering temporal and spatial variation of viscosity

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Hunan Institute of Water Resources and Hydropower Research, Changsha 410007, China;
3. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China

摘要

摘要: 封孔止浆技术是松软地层注浆防渗加固的重要手段,而封孔浆体自下而上的注入方式及其黏度时变特性导致浆体在止浆段长内黏度呈现出空间分布不均匀。通过流变试验获取封孔浆体流变参数与流型,建立考虑黏度时空变化的宾汉流体同心环状劈裂封孔浆体止浆模型,推导出黏度时空变化的封孔浆体止浆的控制方程,并定量分析封孔浆体的止浆能力,最后将研究成果成功应用于河堤防渗加固注浆工程。研究结果表明,封孔浆体黏度时空变化对浆体封孔止浆能力影响较大,其止浆能力与浆体流变参数、浆体塑性强度、封孔高度等有关;封孔浆体所能承受的极限注浆压力随封孔浆体固化剂掺量的增加或封孔浆体塑性强度的增大而增大,且这种变化随封孔高度的增高而表现的越明显,综合考虑注浆堵管、后续拔管等问题,封孔浆体水固比宜控制在1∶1左右,且黏土含量不宜超过50%,固化剂掺量宜控制在1.2%~1.8%;现场钻孔取样、压水试验均反映注浆后地层连续性和整体性得到了显著提高,已达到设计防渗加固标准,理论计算推导虽与实测结果存在一定误差,但可满足实际工程要求。研究结果有利于封孔浆体止浆技术的进一步推广应用,可为工程实践提供理论指导。
- 封孔浆体 /
- 注浆 /
- 黏度 /
- 时空变化 /
- 理论推导
Abstract: The borehole sealing technique is an important method for anti-seepage and grouting reinforcement of soft soil strata. However, the bottom-up injection method and the time-varying characteristics of viscosity will cause the viscosity of sealing slurry to present a nonuniform spatial distribution in through range. The rheological parameters and flow patterns of the sealing slurry are obtained through rheological tests. The sealing model for concentric annular fracturing sealing slurry of Bingham fluid is established considering the temporal and spatial variation of viscosity, and the relevant governing equations are deduced. The sealing capacity of slurry is quantitatively analyzed, and the research results are successfully applied to the anti-seepage and grouting reinforcement of a levee. The results show that the temporal and spatial variation of viscosity of slurry has a great influence on its sealing capacity which is related to the rheological parameters of slurry, plastic strength of slurry and height of borehole. The ultimate grouting pressure of the sealing slurry increases with the increasing amount of curing agent or its increasing plastic strength and such phenomenon is obviously reflected with the increasing height of borehole. Considering the issues of grouting plugging and pipe pulling, the water-solid ratio of the sealing slurry should be controlled to be about 1:1, the clay content should not exceed 50%, and the content of curing agent should be controlled in the range of 1.2% to 1.8%. The on-site borehole sampling and pump-in tests show that the continuity and integrity of the soil strata are significantly improved after grouting and the anti-seepage reinforcement standards are achieved. Although the theoretical derivations have certain errors with the measured results, they can conform to the actual engineering requirements. The research results are conducive to the further application of the slurry sealing technique, and they may provide theoretical guidance for engineering practice.
- sealing slurry /
- grouting /
- viscosity /
- temporal and spatial variation /
- theoretical deduction

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参考文献(12)

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期刊类型引用(2)

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