本文關(guān)鍵詞： 鉆孔出水量 鉆孔注漿量 巖溶結(jié)構(gòu) 數(shù)值模擬 擴(kuò)散距離　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以劉橋一礦、恒源煤礦和五溝煤礦太原組上段灰?guī)r為研究對象,在研究了礦區(qū)地質(zhì)與水文地質(zhì)條件的基礎(chǔ)上,通過對太原組上段灰?guī)r巖性、巖溶裂隙發(fā)育特征、鉆孔出水量、鉆孔注漿量、鉆孔埋深及物探異常區(qū)等資料的收集和整理,對研究區(qū)太原組上段灰?guī)r巖溶結(jié)構(gòu)類型進(jìn)行了劃分,同時對漿液在巖體中的擴(kuò)散效應(yīng)進(jìn)行了數(shù)值模擬,還對研究區(qū)工作面底板注漿加固與含水層改造原位試驗(yàn)結(jié)果進(jìn)行了分析,最后建立了巖溶結(jié)構(gòu)地質(zhì)模型,并對不同結(jié)構(gòu)中漿液的擴(kuò)散效應(yīng)進(jìn)行了數(shù)值模擬。該研究成果對皖北礦區(qū)后續(xù)工程具有一定的指導(dǎo)作用。取得的主要成果和認(rèn)識有： 1.在系統(tǒng)分析研究區(qū)太原組上段灰?guī)r巖性以及巖溶裂隙發(fā)育特征的基礎(chǔ)上基于底板成孔與注漿信息,闡述了鉆孔出水量與注漿量之間的關(guān)系以及鉆孔出水量、鉆孔注漿量與鉆孔埋深之間的關(guān)系；依據(jù)鉆窩單孔最大出水量和單位體積注漿量兩個指標(biāo),建立了四類太原組上段灰?guī)r含水層巖溶結(jié)構(gòu)類型,即溶孔-溶管網(wǎng)絡(luò)型、溶隙-溶孔網(wǎng)絡(luò)型、裂隙-溶隙網(wǎng)絡(luò)型和單一裂隙網(wǎng)絡(luò)型,并分析了各種類型的基本特征以及在各礦的分布情況； 2.建立了均質(zhì)結(jié)構(gòu)和裂隙結(jié)構(gòu)兩種數(shù)值模型,采用COMSOL Multiphysics對漿液在巖體中的擴(kuò)散效應(yīng)進(jìn)行模擬,結(jié)果表明：相同模擬時間內(nèi),對于均質(zhì)結(jié)構(gòu)體,其它注漿參數(shù)一定時,隨著巖體孔隙率和注漿壓力的增大、漿液密度的減小,漿液的擴(kuò)散距離逐漸增大；對于裂隙結(jié)構(gòu)體,其它注漿參數(shù)一定時,隨著裂隙張開度、裂隙長度以及注漿壓力的增加、水壓力的減小,漿液沿裂隙擴(kuò)散越遠(yuǎn)； 3.通過開展工作面底板注漿加固與含水層改造原位試驗(yàn),對現(xiàn)場注漿過程中注漿壓力的資料進(jìn)行整理,統(tǒng)計(jì)出研究區(qū)不同結(jié)構(gòu)灰?guī)r含水層注漿改造過程中隨時間變化的孔口壓力值,揭示了巖溶結(jié)構(gòu)對注漿壓力隨時間變化的控制作用。根據(jù)工作面底板注漿孔串漿資料,得出不同的巖溶結(jié)構(gòu)中漿液的擴(kuò)散距離不同,表明巖溶結(jié)構(gòu)對漿液擴(kuò)散效應(yīng)的控制： 4.建立了太原組上段灰?guī)r含水層巖溶結(jié)構(gòu)地質(zhì)模型,對漿液在不同巖溶結(jié)構(gòu)中的擴(kuò)散效應(yīng)進(jìn)行了數(shù)值模擬,得出各種類型巖溶結(jié)構(gòu)中漿液的擴(kuò)散距離,結(jié)合現(xiàn)場注漿試驗(yàn),給出了不同巖溶結(jié)構(gòu)含水層漿液的擴(kuò)散距離。
[Abstract]:Taking the limestone of the upper Taiyuan formation of Liuqiao No. 1 Coal Mine, Hengyuan Coal Mine and Wugou Coal Mine as the research object, on the basis of studying the geological and hydrogeological conditions of the mining area, the characteristics of limestone lithology and karst fissure development in the upper segment of Taiyuan formation are analyzed. Based on the data collection and arrangement of borehole water output, borehole grouting quantity, borehole burial depth and geophysical anomaly area, the karst structure types of limestone in the upper section of Taiyuan formation are divided, and the diffusion effect of slurry in rock mass is simulated numerically. In addition, the in-situ test results of grouting reinforcement and aquifer reconstruction of the working face in the study area are analyzed. Finally, a geological model of karst structure is established. Numerical simulation of the diffusion effect of slurry in different structures has been carried out. The results of this study have a certain guiding effect on the subsequent projects in the mining area of northern Anhui. The main results and understandings are as follows:. 1. On the basis of systematic analysis of limestone lithology and karst fissure development in the upper segment of Taiyuan formation, based on the information of bottom hole formation and grouting, the relationship between borehole discharge and grouting quantity and borehole water discharge are expounded. According to the two indexes of maximum water output and unit volume grouting quantity of single hole in drilling hole, four types of karst structure of limestone aquifer in the upper segment of Taiyuan formation are established, that is, the type of karst structure of the limestone aquifer in the upper part of Taiyuan formation, that is, the type of dissolving pore and dissolved pipe network. The basic characteristics of various types and their distribution in each ore are analyzed in this paper, such as the dissolving-dissolved pore network, the fission-solubilization network and the single fissure network. 2. Two numerical models of homogeneous structure and fissure structure are established, and the diffusion effect of slurry in rock mass is simulated by COMSOL Multiphysics. The results show that: for homogeneous structure, other grouting parameters are fixed in the same simulation time. With the increase of rock porosity and grouting pressure, the dispersion distance of slurry increases gradually with the decrease of grouting density, and with the increase of crack opening, crack length and grouting pressure when other grouting parameters are fixed. With the decrease of water pressure, the slurry diffuses further along the fissure. 3.Through carrying out the in-situ test of grouting reinforcement and aquifer reconstruction on the floor of the working face, the data of grouting pressure in the field grouting process are sorted out. According to the data of grouting hole string at the bottom of the face, the variation of pore pressure with time during grouting reconstruction of limestone aquifer with different structures in the study area is calculated, and the controlling effect of karst structure on grouting pressure with time is revealed. It is concluded that the diffusion distance of slurry in different karst structures is different, which indicates that karst structure controls the effect of slurry diffusion. 4. A geological model of karst structure of limestone aquifer in upper segment of Taiyuan formation is established. The diffusion effect of slurry in different karst structures is simulated numerically, and the diffusion distance of slurry in various types of karst structure is obtained, combined with field grouting test. The diffusion distance of aquifer slurry with different karst structure is given.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD163

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