砂土介质中颗粒浆液的渗滤系数及加固机制研究

doi:10.13722/j.cnki.jrme.2016.1510

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摘要

基于质量平衡方程、线性滤过定律、颗粒浆液密度方程及边界条件等，建立砂土介质中颗粒浆液的渗滤系数λ定量关系式及加固强度理论模型；依据注浆试验中水泥浆密度及扩散距离等参数，得出l理论计算值，分析其变化规律并与类似试验测量值进行对比；通过单轴抗压强度试验，研究浆液不同扩散距离处的固结体强度，且将试验值与理论值进行差异分析。结果表明，特定条件下l随注浆时间推移而增长，并非是传统研究中的恒定常数；扩散距离相同时，固结体强度与l呈负相关；固结体强度随浆液扩散距离延长而衰减，本试验中衰减率可达9.2 kPa/cm；固结体强度理论值与试验值偏差±22%，两者吻合度较高。研究成果可指导工程设计，具有一定的实际应用价值。

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	李术才1
	冯啸1
	刘人太1
	李克先1
	2
	李卫1
	张世杰1
	随海通1
	王晓晨1

关键词 ：土力学, 砂土介质, 颗粒浆液, 渗滤系数, 加固机制

Abstract：

Based on mass conservation equation，linear infiltration law，grout density equations and boundary conditions，a quantitative formula of infiltration coefficient l and a theoretical model of reinforcing strength were proposed for grout suspensions in sandy soil medium. Theoretical calculation of infiltration coefficient was obtained according to grout density and diffusion distance in grouting test. Then the variation law of l was analyzed and compared with the measured values of similar experiments. Through uniaxial compressive strength test，consolidation strength at different distance was studied. Then difference analysis was conducted between experimental value and theoretical value. The results show that，infiltration coefficient increases with grout time in certain conditions，and not a constant parameter in traditional studies. There is a significant negative correlation between consolidation strength and infiltration coefficient when the diffusion distance is the same. The consolidation strength deceases along grout penetration distance，and strength decreasing rate can be up to 9.2 kPa/cm. Deviation between theoretical value and experimental value is ±22%，which presents a higher coincidence degree. The results have practical value and can provide reference for construction design.

Key words： soil mechanics sandy soil medium grout suspension infiltration coefficient reinforcing mechanism

引用本文:

李术才1，冯啸1，刘人太1，李克先1，2，李卫1，张世杰1，随海通1，王晓晨1. 砂土介质中颗粒浆液的渗滤系数及加固机制研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4220-4228.
LI Shucai1，FENG Xiao1，LIU Rentai1，LI Kexian1，2，LI Wei1，ZHANG Shijie1，SUI Haitong1，WANG Xiaochen1. Study on infiltration coefficient and reinforcing mechanism of grout suspension in sandy soil medium. , 2017, 36(S2): 4220-4228.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.1510 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4220

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