本文選題：軟巖 + 凍融循環(huán)�。� 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：西北地區(qū)礦井建設(shè)中,多數(shù)井筒需要穿過白堊系、侏羅系巨厚巖層,該巖層具有含水量大、巖性松軟等特點,普通鑿井法施工難度大,多采用凍結(jié)法鑿井。但是,凍結(jié)法施工成井后大部分井筒出現(xiàn)井壁淋水、馬頭門涌水等水害問題,情況嚴(yán)重的還可能發(fā)生淹井事故,導(dǎo)致井筒施工工期長,水治理費用高等問題。目前,多采用壁后注漿治理水害,但部分井筒注漿治水效果不明顯,依然存在井筒涌水量過大,影響安全生產(chǎn)。針對上述問題,論文開展白堊系凍結(jié)法施工成井后井壁淋水機理及注漿治理技術(shù)研究,具有重要的工程應(yīng)用價值和理論意義。本文以新莊煤礦為工程背景,通過室內(nèi)試驗和理論分析研究凍融作用對白堊系軟巖微觀結(jié)構(gòu)影響,物理模擬凍結(jié)井筒涌水機理研究,進(jìn)而探討軟巖、軟巖與混凝土凝結(jié)體滲透特性變化規(guī)律,同時對模擬井筒試件進(jìn)行注漿抗?jié)B實驗,主要結(jié)論有:(1)通過孔隙率測試實驗數(shù)據(jù),得出一次凍融作用下粗、中、細(xì)砂巖滲透系數(shù)比原始滲透系數(shù)分別增大了50.8%、25.5%、28.5%,二次凍融后滲透系數(shù)比原始滲透系數(shù)增加了134.9%、76.8%、64.2%。掃描電鏡實驗表明:一次凍融后巖石顆粒之間松散、脫離,孔隙增大;二次凍融后孔隙裂隙繼續(xù)發(fā)育,并且產(chǎn)生較長裂隙、孔隙裂隙貫穿性好。說明凍融作用下白堊系軟巖孔隙率增大,內(nèi)部產(chǎn)生大量貫穿性裂隙,形成弱導(dǎo)水通道。(2)進(jìn)行粗砂巖、中砂巖和細(xì)砂巖凍融前后低溫氮吸附實驗,進(jìn)一步從微觀結(jié)構(gòu)分析凍融作用下軟巖孔隙結(jié)構(gòu)變化情況。實驗表明:粗砂巖凍融循環(huán)后孔隙體積增加以大孔為主,中孔為輔,一次凍融后孔隙率增幅9.8%,二次凍融后孔隙率增幅15.0%。中砂巖凍融循環(huán)后孔隙體積增加以大孔、中孔為主,二次凍融循環(huán)后中孔增量顯著,一次凍融后孔隙率增幅9.4%,二次凍融后孔隙率增幅13.9%。細(xì)砂巖凍融循環(huán)后孔隙體積增加以中孔為主,大孔為輔,二次凍融循環(huán)后中孔增量多,一次凍融后孔隙率增幅7.6%,二次凍融后孔隙率增幅14.2%。(3)自主設(shè)計并加工了模擬井筒凍結(jié)實驗裝置,通過室內(nèi)實驗驗證了凍融循環(huán)對巖石與混凝土井壁接觸面產(chǎn)生破壞,巖石與混凝土出現(xiàn)分界面,形成導(dǎo)水通道,導(dǎo)致巖石與混凝土組合體滲水能力增強。(4)選取普通硅酸鹽水泥、超細(xì)水泥和脲醛樹脂三種漿液,對凍融作用后的井筒模擬裝置進(jìn)行重復(fù)注漿,測量每次注漿后巖石試件的滲透系數(shù),對測量結(jié)果進(jìn)行對比分析,研究不同注漿材料及注漿壓力對軟巖及軟巖與混凝土組合體堵水效果。分析結(jié)果:滲透系數(shù)隨注漿次數(shù)增加而減小,對于同一種漿液滲透系數(shù)隨注漿次數(shù)增加而減緩;對與顆粒型水泥漿液,增大水灰比、提升注漿壓力都可以提高漿液可注性;超細(xì)水泥漿液注入性比硅酸鹽水泥漿液好,堵水效果明顯�；瘜W(xué)漿液能夠注入到水所能到達(dá)的孔隙裂隙,在低水壓情況下可以完全不漏水,堵水效果特別理想。
[Abstract]:In the mine construction of northwest area, most of the shaft needs to pass through the Cretaceous and Jurassic strata, which have the characteristics of large water content and soft lithology, and the common sinking method is difficult to be constructed, so the freezing method is often used to drill the shaft. However, after the completion of freezing construction, water hazards such as well wall flooding and water gushing at Matou gate appear in most of the wellbore, and serious flooding accidents may occur, resulting in long construction period and high water treatment cost. At present, most of the water hazards are treated by backwall grouting, but the effect of grouting is not obvious in some wellbore, and there is still too much water inflow in the wellbore, which affects the safety of production. In view of the above problems, the paper carries out the research on the mechanism of well wall watering and grouting treatment technology after the Cretaceous freezing construction, which has important engineering application value and theoretical significance. In this paper, taking Xinzhuang Coal Mine as engineering background, the influence of freeze-thaw on the microstructure of Cretaceous soft rock is studied through laboratory tests and theoretical analysis, and the mechanism of freezing wellbore water gushing in physical simulation is studied, and the soft rock is discussed. The permeability characteristics of soft rock and concrete condensate are changed. At the same time, the grouting impermeability experiment is carried out on the simulated wellbore specimen. The main conclusions are as follows: 1) through the porosity test data, the coarse and middle thickness under a freeze-thaw action can be obtained. Compared with the original permeability coefficient, the permeability coefficient of fine sandstone increased by 50.8 and 25.5and 28.5.The permeability coefficient after secondary freezing and thawing increased by 134.9 and 76.8and 64.2than the original permeability coefficient respectively. The SEM results show that the rock particles are loosely separated and the pores increase after the first freeze-thaw, and the pore fractures continue to develop after the secondary freezing and thawing, and long cracks are produced, and the pore fractures are permeable well. The results show that the porosity of Cretaceous soft rock increases under freezing and thawing, and a large number of penetrating cracks are formed in the inner part of the soft rock, forming a weak water conductivity channel. The coarse sandstone and fine sandstone are tested for nitrogen adsorption at low temperature before and after freezing and thawing. The change of pore structure of soft rock under freezing and thawing is further analyzed from microstructure. The experimental results show that the pore volume of coarse sandstone increased mainly by large pore, supplemented by mesopore, increased by 9.8 percent after primary freezing and thawing, and increased by 15.0 by secondary freezing and thawing. After freeze-thawing cycle, the pore volume increases mainly in large pore and middle pore. After secondary freeze-thaw cycle, the increment of mesopore is remarkable, the increase of porosity after primary freezing and thawing is 9.4, the increase of porosity after secondary freezing and thawing is 13.9. After freezing and thawing cycle, the pore volume of fine sandstone increased mainly in mesopore, supplemented by large pore, and increased after secondary freeze-thaw cycle. After freeze-thawing, the porosity increase of 7.6% and the increase of porosity after secondary freezing and thawing 14.22%. 3) the experimental device of simulating wellbore freezing has been designed and processed independently. Through laboratory experiments, it has been verified that freezing and thawing cycle has destroyed the interface between rock and concrete shaft wall. The interface between rock and concrete formed a channel of water conductivity, which led to the enhancement of permeability of rock and concrete.) three kinds of slurry, ordinary Portland cement, ultrafine cement and urea-formaldehyde resin, were selected. The borehole simulation device after freezing and thawing is repeated grouting, the permeability coefficient of rock specimen after each grouting is measured, and the measured results are compared and analyzed. The effects of different grouting materials and grouting pressure on soft rock and the combination of soft rock and concrete are studied. The results showed that the permeability coefficient decreased with the increase of grouting times, decreased with the increase of grouting times for the same kind of slurry, increased the water-cement ratio and raised the grouting pressure to increase the injectability of the same kind of slurry, and the permeability coefficient of the same kind of slurry decreased with the increase of the number of grouting times, and the increase of water-cement ratio to granular cement slurry, the increase of grouting pressure. The injectability of superfine cement slurry is better than that of Portland cement slurry, and the water plugging effect is obvious. The chemical slurry can be injected into the pore fissure which can be reached by water, and can not leak completely under the condition of low water pressure, so the water plugging effect is very ideal.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD745

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 吳璋;王曉東;武光輝;朱明誠;;井筒凍結(jié)孔解凍涌水發(fā)生機制及其控制技術(shù)[J];煤田地質(zhì)與勘探;2015年01期

2 段品佳;王芝銀;;煤巖孔隙率與滲透率變化規(guī)律試驗研究[J];地下空間與工程學(xué)報;2013年06期

3 賈海梁;劉清秉;項偉;張偉麗;郎林智;;凍融循環(huán)作用下飽和砂巖損傷擴展模型研究[J];巖石力學(xué)與工程學(xué)報;2013年S2期

4 楊峰;寧正福;胡昌蓬;王波;彭凱;劉慧卿;;頁巖儲層微觀孔隙結(jié)構(gòu)特征[J];石油學(xué)報;2013年02期

5 趙強;武光輝;;凍結(jié)法施工解凍水害的機理及治理技術(shù)[J];中國礦業(yè);2012年S1期

6 李杰林;周科平;張亞民;許玉娟;;基于核磁共振技術(shù)的巖石孔隙結(jié)構(gòu)凍融損傷試驗研究[J];巖石力學(xué)與工程學(xué)報;2012年06期

7 林東才;魏夕合;劉尊欣;張培森;;義橋煤礦立井井筒涌水機理與注漿封堵技術(shù)[J];煤礦安全;2012年03期

8 楊更社;奚家米;;煤礦立井凍結(jié)設(shè)計理論的研究現(xiàn)狀與展望分析[J];地下空間與工程學(xué)報;2010年03期

9 郭曉華;蔡衛(wèi);馬尚權(quán);陳學(xué)習(xí);;不同煤種微孔隙特征及其對突出的影響[J];中國煤炭;2009年12期

10 李相臣;康毅力;羅平亞;;應(yīng)力對煤巖裂縫寬度及滲透率的影響[J];煤田地質(zhì)與勘探;2009年01期

相關(guān)會議論文 前1條

1 楊維好;;十年來中國凍結(jié)法鑿井技術(shù)的發(fā)展與展望[A];中國煤炭學(xué)會成立五十周年高層學(xué)術(shù)論壇論文集[C];2012年

，

本文編號：1857518