基于上限原理的兩種巖溶隧道巖墻厚度計算方法
發(fā)布時間：2018-11-28 07:23
【摘要】：巖溶隧道掌子面附近的高壓富水溶腔易造成突水、突泥地質(zhì)災害,在施工中確定合適的巖墻厚度是一個亟待解決的技術問題�；跇O限分析上限原理提出了兩種新的巖墻厚度計算思路,即線性Mohr-Coulomb準則方法與非線性Hoek-Brown準則方法。根據(jù)構建的相應三維破壞模式,推導演繹了計算步驟,最終得到了這兩種方法的巖墻厚度表達式。采用線性Mohr-Coulomb方法計算了Ⅰ~Ⅴ級圍巖下的巖墻安全厚度。結(jié)果表明:隨著圍巖等級的逐級降低,即黏聚力、內(nèi)摩擦角的減小,巖墻厚度在不斷增大。對于非線性Hoek-Brown方法則分析了各個參數(shù)對巖墻厚度的影響,并根據(jù)計算結(jié)果繪制了巖墻的破壞形狀與范圍;同時,給出了Hoek-Brown常數(shù)A、B的建議取值,即圍巖Ⅰ至Ⅵ級、巖性條件從好至壞,分別建議A取0.5~0.3,B取0.7~0.9。應用這兩種方法分別計算了宜萬鐵路云霧山隧道與野三關隧道溶腔的預留巖墻厚度,與工程實際吻合良好,從而驗證了方法的可行性。這兩種計算方法可為今后高風險巖溶地區(qū)隧道的設計與施工提供參考。
[Abstract]:The high pressure and rich water cavity near the face of karst tunnel can easily cause water inrush and mud inrush geological hazard. It is a technical problem to be solved urgently to determine the appropriate thickness of rock wall in construction. Based on the upper limit principle of limit analysis, two new methods for calculating the thickness of rock wall are proposed, namely, linear Mohr-Coulomb criterion method and nonlinear Hoek-Brown criterion method. According to the corresponding three dimensional failure model, the calculation steps are deduced and the expressions of the rock wall thickness of the two methods are obtained. The safety thickness of rock wall under class 鈪，
本文編號：2362211
[Abstract]:The high pressure and rich water cavity near the face of karst tunnel can easily cause water inrush and mud inrush geological hazard. It is a technical problem to be solved urgently to determine the appropriate thickness of rock wall in construction. Based on the upper limit principle of limit analysis, two new methods for calculating the thickness of rock wall are proposed, namely, linear Mohr-Coulomb criterion method and nonlinear Hoek-Brown criterion method. According to the corresponding three dimensional failure model, the calculation steps are deduced and the expressions of the rock wall thickness of the two methods are obtained. The safety thickness of rock wall under class 鈪，
本文編號：2362211
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2362211.html
