浅谈煤矿软岩巷道的支护及应用.pdfVIP

浅谈煤矿软岩巷道的支护及应用 许孝建崔可存 中煤第五建设公司第三十一工程处，河北 邯郸 056003 摘 要：针对山东郓城煤矿施工轨道巷时遇见岩石属于典型的软页岩，煤加矸层的岩溶陷落区 域，采用”注浆加固，管棚支护，短掘进，快支护”的方法。由于开掘巷道破坏了原应力平衡状 态，围岩应力产生了重新分布，首先采取”锚杆+金属条丝网+锚索”进行初期支护，初次支护 软岩变形能量来自大范围的上覆地层，常由急到缓，初次支护不宜”硬顶”，采取了卸压、可缩 等让压措施，以柔克刚，先释放一部分岩体变形能；待岩层趋于稳定状态时，进行二次支护，二 期支护是在初期支护的基础让进行套金属棚的支护方法，对残余的岩体变形能进行”硬顶”， 也就是”先让后顶”，取得了良好的预期效果，在软弱岩石的掘进方面积累了宝贵经验。 关键词：岩层；围岩；初期支护；二次支护 TD353 A 1672-1098(2012)S1-0335-03 DiscussionoftheSupportingandApplicationonCoalMineSoftRockTunnels XUXiao-jianCUIKe-cun The31stConstructionDivisionofChineseCoalFifthConstructionco.LTD.HandanHebeiProvince056003,China Abstract:FortheShandongYunchengmineconstructtheconstructiontunnelmeetsthetypicalsoftshaleandexist karstcollapsearea,weadoptthemeasurescalledgroutingreinforcement,piperoofsupport,shortboring,fast support.Surroundingrocklosttheoriginalstressequilibriumandstressredistributionduetodiggingthetunnel, sotheinitialsupportuseanchor+metalstripsmeshandanchorcable,andshouldnotbestraighttouchthesur roundingrock,andneedtoreleasethepartoftherockmassdeformationenergybyusecontractibleandsoftappara tus.Becausetheinitialrockdeformationenergycomesfromthewideoverlyingstrata,oftenanxiousatfirstand changeslow.Whentherockformationbecomessteady,itsrighttimeforthesecondarysupporting.Thesecondary supportmeansmakemetalshedinthebasisoftheinitialsupport,andstraighttouchtherock.Wecancallthe methodreleasefirstsupportsecondandachievedgoodexpectedresult,intermsofweakrocktunnelinghasaccu mulatedvaluableexperience. Keywords:rock ;surroundingrock ;initialsupport ;secondarysupport {术用驮苜州 上支护 （简称 吏护 （简称锚 疑土支护 （简 口锚索联合支 JHL，、7日 ‘ 地应力大／1 巷软弱岩i 直工软弱岩