松软地层脉动灌浆封孔浆体止浆机制初步研究

张贵金; 梁经纬; 杨东升; 潘烨; 彭春雷

doi:10.11779/CJGE201602003

松软地层脉动灌浆封孔浆体止浆机制初步研究 English Version

1. 长沙理工大学水利工程学院,湖南长沙 400041; 2. 湖南省水利水电科学研究所,湖南长沙 410007; 3. 湖南宏禹水利水电岩土工程有限公司,湖南长沙 410007

详细信息

作者简介:
张贵金(1964- ),男,湖南张家界人,博士,教授,主要从事基础处理技术,岩土工程、水利工程风险评价研究。E-mail: gjzhang84@126.com。

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出版历程
- 收稿日期: 2015-01-06
- 发布日期: 2016-02-24

Mechanism of stemming slurry materials for pulsating grouting in soft strata

1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Hunan Water Resources and Hydropower Research Institute, Changsha 410007, China; 3. Hongyu Hydro-electric Geo-engineering Company Limited, Changsha 410007, China

摘要

摘要: 浆体封闭脉动灌浆是松软地层防渗加固的有效手段,但封孔浆体的止浆机制尚不明确。基于工程断裂力学以及宾汉姆流体同心环状劈裂流动模型,对脉动灌浆封孔浆体的止浆机制进行了定性分析,并基于能量守恒,推导出了脉动灌浆封孔浆体止浆的控制方程。分析了脉动灌浆封孔浆体的止浆能力与浆液流变性能、封孔浆体性能以及脉动频率的关系,封孔浆体的承载极限灌浆压力随浆液塑性黏度和屈服应力的增大而增大,随封孔浆体塑性强度的增大呈线性增加,随脉动持续时间的增加而减小,随脉动间隔时间的增大而增大,随封孔高度的增加不断增大。利用自制室内试验装置,验证了脉动灌浆封孔浆体的止浆机制。在南水北调中线河南鹤壁段引水渠边坡防渗工程中,针对松软地质条件,采用封孔浆体止浆技术对边坡工程进行了自下而上分段脉动灌浆,灌后抽水试验表明地层渗透系数达到10^-5~10^-6cm/s,对比传统灌浆工艺节省20%工作量。
- 松软地层 /
- 脉动灌浆 /
- 封孔浆体 /
- 止浆机制
Abstract: The pulsating grouting with slurry materials is an effective method for anti-seepage and reinforcement in soft strata, but the mechanism of stemming slurry materials is not clear. Based on the engineering fracture mechanics and Bingham fluid concentric annular narrow gap flow model, the mechanism of stemming slurry materials is analyzed qualitatively, and based on the conservation of energy, the governing equation for the stemming slurry materials is deduced. The relationship among the limit loading pressure of slurry materials in pulsating grouting, the rheological properties of grouting slurry, the performance of sealing slurry and the pulsating frequency is analyzed. The limit loading pressure of the slurry materials increases with the increase of plastic viscosity of slurry, yield stress plastic strength of sealing slurry and interval time of pulse, and decreases with the increase of duration time of pulse. The effect increases with the increase of the height of hole sealing. The mechanism of stemming slurry materials is verified by the self-made indoor experimental device. For the anti-seepage project in the slope of the diversion canal in Hebi of Henan, which is in the Middle Route Project of South-to-North Water Diversion, in view of the soft geological conditions, the stemming slurry technology of slurry materials is applied to the slope project by means of segmented pulsating grouting from bottom to top. The pumping tests after grouting indicate that the permeability reaches 10^-5~10^-6 cm/s, and the amount of work of 20% is saved compared to that of the traditional grouting technology.
- soft stratum /
- pulsating grouting /
- slurry material /
- mechanism of stemming

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参考文献(14)

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