基于渗滤效应的水泥浆液多孔介质注浆机理及其工程应用

发布时间：2018-01-29 02:45

本文关键词： 多孔介质水泥类浆液深层渗滤注浆机理工程应用　出处：《山东大学》2014年博士论文　论文类型：学位论文

【摘要】：注浆技术是岩土工程中一门专业性很强的学术分支,通过注浆材料的充填和胶结作用实现对受注地层的加固和堵水目的,改善其水文地质和工程地质条件,广泛应用于隧道、矿山、水电站等地下工程的特殊地质灾害治理,并取得了良好的治理效果。伴随着注浆技术的广泛应用,注浆理论、施工技术和注浆材料的研究和应用迅速发展,注浆材料的种类日趋多样化,性能也千差万别。其中水泥类浆液是指以水泥为主体的注浆材料,主要包括普通水泥浆液、水泥-水玻璃浆液和水泥基高聚物改性浆液等,由于价格低廉、环保无毒等优点仍然被广泛采用。普通水泥浆液,属于颗粒型浆液,本文针对水泥浆液多孔介质渗透研究较少的渗滤效应展开研究,主要研究其在渗透扩散过程中的深层渗滤(deep bed filtration)现象针对水泥类浆液首先分析了水泥浆液在多孔介质中的可注性,重点分析了水泥浆液颗粒的表层渗滤现象和介质内部深层渗滤现象。开展了浆液颗粒表层渗滤试验,研究了多孔介质孔隙直径、浆液水灰比和注浆压力三个因素对水泥浆液的表层渗滤的影响,根据试验结果,通过回归分析得到了恒压注浆时注浆量与多孔介质孔隙直径、浆液浓度和注浆压力之间的函数关系；选取混合粒径的砂样开展了一维长柱型渗透试验,研究了考虑深层渗滤效应时注浆过程中的渗流压力的时变规律,分析了深层渗滤效应对注浆效果的影响,推导了多孔介质注浆深层渗滤理论,采用两个假设,F(σ)=1和浆液浓度c为常数,结合试验结果,对注浆过程中的压力变化进行了理论分析,通过对比分析验证了两个假设的合理性。在此渗滤效应研究的基础上,将可注性划分为三个阶段,分析了不同阶段内浆液颗粒的渗滤效应对注浆机理的影响。研发了三维注浆模型试验架,开展了水泥浆液的砂体注浆渗透试验,通过监测系统对注浆过程中的渗流压力和土压力进行了监测,获得了两个参数随时间的变化规律。注浆结束后通过清除模型填充体分析了浆液在砂层内的注浆扩散特征,对不同位置处的注浆结石体进行取芯并测试了其抗压强度,得到了抗压强度在水平面上的分布规律。结合中梁山隧道角砾岩破碎带高压大流量涌水治理工程,对不同注浆材料的力学性能、粘度性能、施工可控性、涌水封堵性能和围岩稳定性等方面进行了评价分析,对注浆材料的注浆性能进行了综合评价,对类似工程具有一定的借鉴意义。
[Abstract]:Grouting technology is a highly specialized branch of geotechnical engineering. Through the filling and cementation of grouting materials, the purpose of strengthening and plugging the injected strata is realized, and the hydrogeological and engineering geological conditions are improved. It is widely used in underground engineering such as tunnels, mines, hydropower stations and other special geological disaster treatment, and achieved good results. With the wide application of grouting technology, grouting theory. The research and application of construction technology and grouting materials are developing rapidly. The types of grouting materials are becoming more and more diversified, and the properties of grouting materials are very different. Among them, cement slurry is the grouting material with cement as the main body. It mainly includes ordinary cement slurry, cement-water glass slurry and cement-based polymer modified slurry. It is widely used because of its low price, environmental protection and non-toxicity. Ordinary cement slurry belongs to granular slurry. In this paper, the percolation effect of cement slurry porous media is studied. The phenomenon of deep bed filationof cement slurry in the process of permeation and diffusion was studied. Firstly, the injectability of cement slurry in porous media was analyzed. The surface percolation phenomenon of cement slurry particles and the deep percolation phenomenon inside the medium were analyzed emphatically. The surface percolation test of slurry particles was carried out, and the pore diameter of porous media was studied. The effects of water cement ratio and grouting pressure on the surface infiltration of cement slurry were studied. According to the test results, the quantity of grouting and pore diameter of porous media were obtained by regression analysis. The functional relationship between grouting concentration and grouting pressure; One-dimensional long column permeation test was carried out with sand samples with mixed particle size. The time-varying law of seepage pressure in the grouting process was studied when the deep infiltration effect was considered, and the influence of the deep infiltration effect on the grouting effect was analyzed. In this paper, the theory of deep infiltration in porous media is derived. The pressure variation during grouting is theoretically analyzed by using two hypotheses (蟽 F-1 and slurry concentration c) as constants and combined with the experimental results. On the basis of the study of the percolation effect, the injectability is divided into three stages, and the influence of the infiltration effect of the slurry particles on the grouting mechanism in different stages is analyzed. A three-dimensional grouting model test stand was developed and the sand body grouting permeability test of cement slurry was carried out. The seepage pressure and earth pressure during grouting process were monitored by monitoring system. At the end of grouting, the grouting diffusion characteristics of slurry in sand layer were analyzed by removing the filling body of the model. The core of grouting stone at different locations was taken and its compressive strength was tested. The distribution of compressive strength in horizontal plane was obtained. Combined with the treatment project of high pressure and large discharge water inrush in the breccia breakage zone of Zhongliangshan Tunnel, the mechanical properties, viscosity properties and construction controllability of different grouting materials are studied. The water gushing plugging performance and surrounding rock stability are evaluated and analyzed, and the grouting performance of grouting materials is comprehensively evaluated, which has certain reference significance for similar projects.
【学位授予单位】：山东大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU472

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