本文選題：深埋隧道 + 剪切破壞理論　； 參考：《巖土工程學(xué)報(bào)》2017年11期

【摘要】：在剪切破壞理論基礎(chǔ)上采用極限分析法對(duì)黏性地層中深埋直墻拱形隧道展開(kāi)研究。首先基于加載試驗(yàn)提出了破裂區(qū)的理論模型,考慮隧道側(cè)面剪切楔形體的雙滑裂面作用建立了側(cè)壓力表達(dá)式,得出側(cè)壓力及豎向支護(hù)壓力的近似解,并提出了隧道側(cè)壓力與豎向土壓力相互作用理論。根據(jù)剪切楔形體的穩(wěn)定建立無(wú)支護(hù)深埋直墻拱形隧道的穩(wěn)定性定量判別條件,得出極限承載力近似解。定義了基于極限分析法的穩(wěn)定安全系數(shù),并分析深埋隧道穩(wěn)定性的影響因素。研究結(jié)果表明:本文提出的破裂區(qū)理論模型、極限承載力值與試驗(yàn)結(jié)果接近;基于雙滑裂面作用的豎向支護(hù)壓力、側(cè)壓力顯著小于傳統(tǒng)理論值;在良好地層中,拱形隧道極限狀態(tài)下的豎向支護(hù)壓力越小則側(cè)壓力越大,側(cè)壓力或側(cè)壓力系數(shù)?越大則豎向支護(hù)壓力越小;黏聚力是無(wú)支護(hù)的深埋直墻拱形隧道穩(wěn)定的必要條件穩(wěn)定安全系數(shù)K隨黏聚力、內(nèi)摩擦角的增大而增大,隨隧道跨度、高度的增大而減小;黏聚力對(duì)K的影響比內(nèi)摩擦角大,跨度對(duì)K的影響比高度大,而埋深越大對(duì)深埋隧道穩(wěn)定安全系數(shù)的影響越小。
[Abstract]:On the basis of the shear failure theory, the limit analysis method is used to study the deep buried straight wall arch tunnel in the viscous stratum. Firstly, the theoretical model of the fracture zone is put forward based on the loading test, and the lateral pressure expression is established considering the double sliding surface of the shear wedge in the side of the tunnel, and the approximate solution of the lateral pressure and the vertical support pressure is obtained. The theory of the interaction of tunnel side pressure and vertical earth pressure is put forward. Based on the stability of the shear wedge shape, the quantitative criterion for the stability of the unsupported deep buried straight wall arch tunnel is established, and the approximate solution of the ultimate bearing capacity is obtained. The stability safety factor based on the limit analysis method is defined and the influence factors of the stability of the deep buried tunnel are analyzed. The results show that the theoretical model of the fracture zone proposed in this paper is close to the test results, and the lateral pressure is significantly smaller than the traditional theoretical value based on the vertical support pressure based on the double sliding surface. The greater the vertical support pressure is, the greater the lateral pressure is, the greater the side pressure or side pressure coefficient is, the greater the coefficient of side pressure or side pressure is greater in a good stratum. The smaller the vertical support pressure is, the cohesive force is the necessary condition of stability of the unsupported deep buried straight wall arch tunnel. The stability safety factor K increases with the cohesion, the increase of the internal friction angle and the increase of the tunnel span and height; the influence of cohesive force on the K is larger than the internal friction angle, and the influence of the span to the K is larger than that of the depth, and the deeper the buried depth is, the deeper the deep buried tunnel is buried. The lower the influence of the stability safety factor of the channel.

【作者單位】： 中交鐵道設(shè)計(jì)研究總院有限公司;
【分類號(hào)】：U451

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本文編號(hào)：1776888