本文關(guān)鍵詞：土巖復(fù)合地層隧道群洞施工力學(xué)響應(yīng)研究　出處：《鐵道標(biāo)準(zhǔn)設(shè)計(jì)》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 地鐵 巖性 小凈距隧道群 施工階段 圍巖穩(wěn)定性 變形特征

【摘要】：為探究小凈距隧道群洞穿越不同地層施工引起的力學(xué)響應(yīng),基于青島地區(qū)土巖復(fù)合地層特殊地質(zhì)條件,通過(guò)數(shù)值計(jì)算并結(jié)合現(xiàn)場(chǎng)測(cè)試數(shù)據(jù),分析小凈距地鐵隧道群洞施工引起的地表沉降、應(yīng)力特征、拱頂變形規(guī)律。結(jié)合工程實(shí)際,將隧道群洞施工劃分為4個(gè)不同階段并依此分析,結(jié)果表明:隧道群在其階段Ⅳ施工后引起地表沉降變形較大,其他階段地表沉降無(wú)明顯變化;不同開(kāi)挖階段對(duì)夾巖的擾動(dòng)程度存在差異,階段Ⅳ施工使夾巖主應(yīng)力出現(xiàn)劇烈變化,且?jiàn)A巖最薄弱處最不利狀態(tài)發(fā)生于階段Ⅳ,但無(wú)剪切破壞現(xiàn)象;隧道拱頂沉降最大增量在該條隧道開(kāi)挖后出現(xiàn),上線隧道施工顯著影響其他隧道拱頂沉降,且能夠引起中線隧道拱頂抬升。研究成果為同類工程的施工穩(wěn)定性分析提供了現(xiàn)場(chǎng)指導(dǎo)和技術(shù)支持。
[Abstract]:In order to explore the mechanical response caused by the construction of small clean distance tunnel group through different strata, based on the special geological conditions of soil and rock composite strata in Qingdao area, the numerical calculation and field test data are carried out. This paper analyzes the surface settlement, stress characteristics and deformation law of arch roof caused by the construction of small clear distance subway tunnel group tunnel. Combined with the engineering practice, the tunnel group tunnel construction is divided into four different stages and analyzed accordingly. The results show that: the tunnel group after stage 鈪，

本文編號(hào)：1382068