本文選題：噴射混凝土　切入點：潮式噴射　出處：《山東科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：針對煤礦巷道的工程背景,堅持機具改革、材料優(yōu)選與工藝優(yōu)化相結合的方法,綜合運用現(xiàn)場調研、數(shù)值分析、實驗測定和工程應用等多種手段,研究滿足煤礦井巷行業(yè)標準、規(guī)范要求的科學、安全、高效的礦用噴射混凝土支護技術體系:針對巷道支護噴射混凝土回彈高、粉塵濃度大的核心技術問題,確定影響噴射效果的噴頭結構三因素:入水口數(shù)量、入水口角度、混合區(qū)段長度,采用正交實驗設計方法得到符合結構參數(shù)的九種新型噴頭設計,通過采用FLUENT軟件對設計得到的九種新型噴頭模型進行流場數(shù)值模擬,分析氣-液-固三相流在噴頭處體積分數(shù)、速度、壓力變化情況,確定三因素對噴射效果的影響程度,得到效果最優(yōu)的新型噴頭模型。根據(jù)相關標準要求,結合煤礦條件和推鏈式混凝土噴射機具特點,從材料優(yōu)選、配比質量的角度研究確定了新型噴頭效果檢測實驗混凝土配比。通過效果檢測實驗數(shù)據(jù)分析,從回彈率、抗壓強度兩方面與現(xiàn)有普通噴頭效果進行對比,實驗結果證明新型噴頭在減塵降彈方面效果優(yōu)異。利用考慮作業(yè)條件的回彈率測定方法作為噴射參數(shù)的判斷標準,研究工作風壓、工作水壓、噴射距離、噴射角度、初噴厚度等潮式噴射工藝參數(shù)對噴射過程回彈率的影響程度,最終確定施工工藝最優(yōu)參數(shù),為巷道支護潮式噴射混凝土技術在礦山行業(yè)的推廣提供理論基礎。通過研究圍巖穩(wěn)定性判定方法,完善煤礦巷道混凝土分區(qū)支護技術,將現(xiàn)場煤礦巷道試驗段按照圍巖穩(wěn)定性分為三個區(qū)域,根據(jù)各分區(qū)對噴層要求進行支護。通過對巷道支護混凝土潮噴技術施工效果的現(xiàn)場測定,檢測結果表明采用新型噴頭減少了物料回彈,降低了錨噴工作面粉塵濃度,提高了噴射質量,為礦工創(chuàng)造了良好的工作環(huán)境,有力促進了巷道支護混凝土潮式噴射技術在煤礦行業(yè)的推廣和應用。
[Abstract]:In view of the engineering background of coal mine roadway, we insist on the method of combining machine and tool reform, material optimization and process optimization, and comprehensively use various means such as field investigation, numerical analysis, experimental measurement and engineering application to study and meet the industry standards of coal mine shaft and roadway. Scientific, safe and efficient technical system of mine shotcrete support: aiming at the core technical problems of high springback and high dust concentration in roadway support, Three factors affecting the nozzle structure are determined: the number of nozzle, the angle of inlet, the length of mixing section, and the design of nine new types of nozzle which accord with the structure parameters by orthogonal experimental design method. By using FLUENT software to simulate the flow field of nine new nozzle models, the volume fraction, velocity and pressure of the gas-liquid-solid three-phase flow at the nozzle are analyzed, and the degree of influence of three factors on the jet effect is determined. A new type of spray head model with optimal effect is obtained. According to the requirements of relevant standards, combined with the coal mine conditions and the characteristics of the push-chain concrete ejector, the material is selected optimally. From the angle of mixing quality, the experimental concrete ratio of new type sprinkler head effect detection is determined. Through the analysis of the experimental data, the effect of the new type sprinkler head is compared from two aspects of springback rate and compressive strength. The experimental results show that the new nozzle has excellent effect in reducing dust and dropping bullets. By using the springback measurement method considering the working conditions as the criterion for judging the injection parameters, the working wind pressure, the working water pressure, the injection distance, the injection angle, and the working wind pressure, the working water pressure, the injection distance and the injection angle are studied. The effect of the initial jet thickness on the springback of the jet process, and the optimal parameters of the construction process are determined. This paper provides a theoretical basis for the popularization of tidal shotcrete technology of roadway support in mining industry. By studying the method of judging the stability of surrounding rock, the concrete zonation supporting technology of coal mine roadway is improved. According to the stability of surrounding rock, the test section of roadway on the spot is divided into three regions, and the shotcrete layer is supported according to the requirements of each zone. The test results show that the new nozzle reduces the rebound of materials, reduces the dust concentration, improves the spray quality, and creates a good working environment for the miners. It has promoted the popularization and application of roadway supporting concrete tide spray technology in coal mine industry.
【學位授予單位】：山東科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD353

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