岩溶管道涌水注浆封堵机理研究及配套注浆装备研发

发布时间：2018-06-14 08:32

本文选题：岩溶管道 + 突涌水　；参考：《山东大学》2017年硕士论文

【摘要】：随着注浆在理论、工艺和材料等方面的发展,注浆在隧道突涌水治理工程中的应用愈加广泛。但岩溶管道型突涌水因其流量高、流速快的特点,管道内多为紊流流场,现行注浆理论多基于层流、达西定律展开,相应注浆封堵理论对管道流并不适用。同时,在工程实践过程中,选择浆材、确定注浆参数、实施注浆工程等等一般是依据相似工程来确定,难免使工程的实施带有一定的盲目性。因此,本文通过理论分析与室内模型试验相结合的方法研究了岩溶管道型涌水注浆封堵规律与机理,研发了一种适用于流量高、流速快的岩溶管道型突涌水灾害的大流量注浆泵,具体研究成果如下:(1)将岩溶涌水划分为五种不同类型,明确岩溶管道涌水具备涌水量大、流速快、治理较难的特点。同时,提出特定条件下的水泥浆液的堆积速度问题是能否产生有效封堵的关键,讨论了单一颗粒的动水启动条件和浆体整体的堆积流速理论。(2)研发了可视化的岩溶管道注浆模拟系统,此系统能够实现不同管道直径、动水流速、注浆参数条件的岩溶管道注浆模拟试验,能够实时记录浆液在动水注浆过程中的扩散形态、压力变化、动水流量变化等参数。(3)开展不同管径下的注浆封堵正交试验研究,选取注浆前后流量变化比、浆液留存高度占比、浆液的逆向扩散距离三种封堵评价标准进行极差分析,分析发现不同管径下的动水封堵的主要控制因素;并研究了动水流速、注浆流量、水灰比等因素对注浆封堵效果的影响规律和原因。(4)提取了试验中四种典型动水流量变化曲线图分析:在注浆前动水流量基本保持稳定;在注浆过程中由于注浆压力的存在,动水流量迅速下降,且在注浆过程中动水流量变化剧烈;停止注浆后动水流量逐渐回升,但要小于初始动水流量。随着各因素的变化,动水注浆三个阶段会产生明显的不同。同时,研究了动水流速变化情况下,浆液运动状态变化规律,提出以浆液的堆积速度判定是否起到封堵效果。分析了两种管路中浆液堆积高度随动水流速的变化规律。(5)结合岩溶管道型涌水注浆封堵机理,对大流量注浆泵进行了整体方案设计,并提出了局部的管路优化设计方案,进行管道损失计算。利用数值分析软件Fluent对注浆泵进行了数值分析,通过流线、压力及流量变化,发现注浆泵内部流场规律,为改进设计方案、优化注浆泵提供了理论依据。同时,进行注浆泵样机调试与试验,判断其运行状况。
[Abstract]:With the development of grouting in theory, technology and materials, grouting has been widely used in tunnel inrush treatment engineering. However, because of its characteristics of high discharge and fast velocity, the current grouting theory is mostly based on laminar flow and Darcy's law, and the corresponding grouting plugging theory is not suitable for pipeline flow. At the same time, in the process of engineering practice, the selection of grouting materials, the determination of grouting parameters and the implementation of grouting projects are generally based on similar projects, which inevitably make the implementation of the project with certain blindness. Therefore, through the combination of theoretical analysis and laboratory model test, this paper studies the plugging law and mechanism of karst pipeline type water gushing grouting, and develops a new method suitable for high flow rate. The research results are as follows: (1) the karst water gushing is divided into five different types, and it is clear that the karst pipeline has the characteristics of large water inflow, fast velocity and difficult treatment. At the same time, it is proposed that the piling speed of cement slurry under certain conditions is the key to effective plugging. The dynamic starting condition of single particle and the accumulation velocity theory of the whole slurry are discussed. A visual grouting simulation system for karst pipeline is developed. The system can realize the different diameter of pipeline and the velocity of dynamic water. The simulation test of grouting parameters in karst pipeline can record in real time the parameters such as diffusion form, pressure change and dynamic water flow change of grouting fluid during dynamic grouting.) the orthogonal test of grouting plugging under different pipe diameters is carried out. Three kinds of plugging evaluation criteria, such as the ratio of flow change before and after grouting, the ratio of retention height of slurry, and the reverse diffusion distance of slurry, were selected for the range analysis. The main controlling factors of hydrodynamic plugging under different pipe diameters were found, and the dynamic water velocity was studied. The influence of grouting flow rate, water-cement ratio and other factors on grouting plugging effect and its causes.) four typical dynamic water flow curves were extracted from the experiment: the dynamic water flow rate remained stable basically before grouting; Due to the existence of grouting pressure, the hydrodynamic flow decreases rapidly and changes sharply in the grouting process, and the hydrodynamic flow increases gradually after the grouting is stopped, but it is smaller than the initial hydrodynamic flow. With the change of various factors, the three stages of hydrodynamic grouting will be obviously different. At the same time, the changing law of slurry motion state under the condition of dynamic water velocity change is studied, and it is proposed that the slurry accumulation velocity can be used to judge whether it plays a plugging effect. In this paper, the variation law of water flow velocity following the height of slurry accumulation in two kinds of pipes is analyzed. (5) combined with the plugging mechanism of karst pipeline type water inrush grouting, the overall scheme design of large flow grouting pump is carried out, and the local optimal design scheme of pipeline is put forward. Calculate the pipeline loss. The numerical analysis software fluent is used to analyze the grouting pump numerically. Through the flow line, pressure and flow rate change, the internal flow field of the grouting pump is found, which provides a theoretical basis for improving the design scheme and optimizing the grouting pump. At the same time, the prototype of grouting pump is debugged and tested to judge its running condition.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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