膨脹性軟巖礦井鋼管支架支護(hù)技術(shù)研究
膨脹性軟巖礦井鋼管支架支護(hù)技術(shù)研究
摘要：針對(duì)查干淖爾礦主斜井泥巖段軟巖巷道的地質(zhì)條件，通過(guò)室內(nèi)實(shí)驗(yàn)對(duì)軟巖圍巖進(jìn)行力學(xué)性能測(cè)試和礦物成分分析，并結(jié)合主斜井泥巖段的巷道變形特點(diǎn)，設(shè)計(jì)了鋼管支架支護(hù)方案，其中，采用淺底拱圓形和橢圓形巷道支護(hù)斷面，鋼管支架主體鋼管選用Φ194×10無(wú)縫鋼管，鋼管內(nèi)充填固體性材料，輔助金屬網(wǎng)支護(hù)和噴層支護(hù)。通過(guò)現(xiàn)場(chǎng)施工和現(xiàn)場(chǎng)監(jiān)測(cè)分析可知，該支護(hù)方案易于施工，并且能夠維持主斜井泥巖段軟巖巷道圍巖的穩(wěn)定。
關(guān)鍵字：膨脹性軟巖、鋼管支架、現(xiàn)場(chǎng)監(jiān)測(cè)
Abstract: based on the Nao mine shafts mudstone chagan’’s section of the soft rock tunnel geological conditions, through the indoor experiment to soft rock surrounding rock mechanical performance testing and mineral composition analysis, and combined with the slope of roadway deformation characteristics for shale, design the steel pipe support support scheme, among them, the shallow tunnel supporting and elliptic arch circular cross section, steel pipe support main body steel tube choose Φ 194 x 10 seamless steel pipe, steel tube filling materials in solid sex, auxiliary metal nets support and shotcrete layer support. Through the field construction site monitoring and analysis, we can conclude that the retaining easy construction scheme, and the ability to maintain the Lord slope mudstone period of soft rock tunnel the stability of surrounding rock.
Key word: pa soft rock, steel pipe support, monitoring
目前國(guó)內(nèi)外對(duì)于軟巖巷道采取要“先柔后剛、先挖后讓、柔讓適度、穩(wěn)定支護(hù)”,由此發(fā)展了錨噴網(wǎng)技術(shù)、錨噴網(wǎng)架支護(hù)技術(shù)等聯(lián)合支護(hù)技術(shù)[1-5]，但是由于圍巖壓力較大，巷道自承能力較差，錨固支護(hù)效果較差，而普通金屬架支護(hù)承載能力較差，且支護(hù)成本相對(duì)較高，受到支護(hù)成本和支護(hù)材料的限制，軟巖巷道支護(hù)困難。隨著鋼管支架支護(hù)技術(shù)逐步成熟，逐步應(yīng)用深井軟巖巷道的支護(hù)中，聯(lián)合其他支護(hù)方式，維持巷道圍巖的穩(wěn)定，為深井軟巖巷道支護(hù)提供一種新的支護(hù)方式[6-7]。
本文結(jié)合查干淖爾礦主斜井泥巖段膨脹性軟巖巷道的地質(zhì)條件和巷道變形特點(diǎn)，采用高強(qiáng)度鋼管支架支護(hù)方案,極大提高巷道徑向支護(hù)反力,提高巷道圍巖的承載能力，現(xiàn)場(chǎng)監(jiān)測(cè)及觀感質(zhì)量表明，鋼管支架支護(hù)方案能夠維持巷道圍巖的穩(wěn)定。
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