本文選題：巖溶管道 + 突涌水�。� 參考：《山東大學(xué)》2017年碩士論文

【摘要】：隨著注漿在理論、工藝和材料等方面的發(fā)展,注漿在隧道突涌水治理工程中的應(yīng)用愈加廣泛。但巖溶管道型突涌水因其流量高、流速快的特點(diǎn),管道內(nèi)多為紊流流場(chǎng),現(xiàn)行注漿理論多基于層流、達(dá)西定律展開(kāi),相應(yīng)注漿封堵理論對(duì)管道流并不適用。同時(shí),在工程實(shí)踐過(guò)程中,選擇漿材、確定注漿參數(shù)、實(shí)施注漿工程等等一般是依據(jù)相似工程來(lái)確定,難免使工程的實(shí)施帶有一定的盲目性。因此,本文通過(guò)理論分析與室內(nèi)模型試驗(yàn)相結(jié)合的方法研究了巖溶管道型涌水注漿封堵規(guī)律與機(jī)理,研發(fā)了一種適用于流量高、流速快的巖溶管道型突涌水災(zāi)害的大流量注漿泵,具體研究成果如下:(1)將巖溶涌水劃分為五種不同類(lèi)型,明確巖溶管道涌水具備涌水量大、流速快、治理較難的特點(diǎn)。同時(shí),提出特定條件下的水泥漿液的堆積速度問(wèn)題是能否產(chǎn)生有效封堵的關(guān)鍵,討論了單一顆粒的動(dòng)水啟動(dòng)條件和漿體整體的堆積流速理論。(2)研發(fā)了可視化的巖溶管道注漿模擬系統(tǒng),此系統(tǒng)能夠?qū)崿F(xiàn)不同管道直徑、動(dòng)水流速、注漿參數(shù)條件的巖溶管道注漿模擬試驗(yàn),能夠?qū)崟r(shí)記錄漿液在動(dòng)水注漿過(guò)程中的擴(kuò)散形態(tài)、壓力變化、動(dòng)水流量變化等參數(shù)。(3)開(kāi)展不同管徑下的注漿封堵正交試驗(yàn)研究,選取注漿前后流量變化比、漿液留存高度占比、漿液的逆向擴(kuò)散距離三種封堵評(píng)價(jià)標(biāo)準(zhǔn)進(jìn)行極差分析,分析發(fā)現(xiàn)不同管徑下的動(dòng)水封堵的主要控制因素;并研究了動(dòng)水流速、注漿流量、水灰比等因素對(duì)注漿封堵效果的影響規(guī)律和原因。(4)提取了試驗(yàn)中四種典型動(dòng)水流量變化曲線圖分析:在注漿前動(dòng)水流量基本保持穩(wěn)定;在注漿過(guò)程中由于注漿壓力的存在,動(dòng)水流量迅速下降,且在注漿過(guò)程中動(dòng)水流量變化劇烈;停止注漿后動(dòng)水流量逐漸回升,但要小于初始動(dòng)水流量。隨著各因素的變化,動(dòng)水注漿三個(gè)階段會(huì)產(chǎn)生明顯的不同。同時(shí),研究了動(dòng)水流速變化情況下,漿液運(yùn)動(dòng)狀態(tài)變化規(guī)律,提出以漿液的堆積速度判定是否起到封堵效果。分析了兩種管路中漿液堆積高度隨動(dòng)水流速的變化規(guī)律。(5)結(jié)合巖溶管道型涌水注漿封堵機(jī)理,對(duì)大流量注漿泵進(jìn)行了整體方案設(shè)計(jì),并提出了局部的管路優(yōu)化設(shè)計(jì)方案,進(jìn)行管道損失計(jì)算。利用數(shù)值分析軟件Fluent對(duì)注漿泵進(jìn)行了數(shù)值分析,通過(guò)流線、壓力及流量變化,發(fā)現(xiàn)注漿泵內(nèi)部流場(chǎng)規(guī)律,為改進(jìn)設(shè)計(jì)方案、優(yōu)化注漿泵提供了理論依據(jù)。同時(shí),進(jìn)行注漿泵樣機(jī)調(diào)試與試驗(yàn),判斷其運(yùn)行狀況。
[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.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU753

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