發(fā)布時間：2018-07-03 19:57

  本文選題：地下水滲流 + 上限分析��； 參考：《巖土工程學報》2017年08期

【摘要】：利用數值模擬技術對地下水滲流情況下盾構隧道開挖面的滲流場進行模擬,獲得了隧道開挖面周邊各節(jié)點的孔隙水壓力。基于極限分析上限定理,利用各節(jié)點孔隙水壓力計算出隧道開挖面上限破壞機制中的孔隙水壓力功率,并將其視為一個外力功率代入虛功率方程中,構建出考慮滲流影響的開挖面安全系數目標函數。通過非線性序列二次規(guī)劃法對該目標函數進行優(yōu)化計算,得到開挖面安全系數上限解。利用強度折減法驗證了該方法的有效性,并將其用于考慮地下水滲流作用的盾構隧道工程實例分析。研究表明:在考慮地下水滲流的情況下,開挖面安全系數隨土體黏聚力、摩擦角、開挖面支護力的增大而增大,隨地下水位的升高而減小;開挖面的破壞范圍隨摩擦角的增大而顯著減小,但地下水位線的位置對開挖面的破壞范圍影響較小。
[Abstract]:The seepage field of excavated surface of shield tunnel under the condition of groundwater seepage is simulated by numerical simulation technique, and the pore water pressure of each node around the tunnel excavation surface is obtained. Based on the upper limit theorem of limit analysis, the pore water pressure power in the upper limit failure mechanism of tunnel excavation surface is calculated by using the pore water pressure of each node, and the pore water pressure power is regarded as an external force power to be substituted into the virtual power equation. The objective function of safety factor of excavated surface considering seepage effect is constructed. The optimization of the objective function is carried out by the nonlinear sequential quadratic programming method, and the upper limit solution of the safety factor of the excavated surface is obtained. The effectiveness of the method is verified by using the strength reduction method, and it is applied to the analysis of shield tunnel engineering with groundwater seepage. The results show that the safety factor of excavated face increases with the increase of soil cohesion, friction angle, excavation support force, and decreases with the increase of groundwater level. The damage range of the excavated surface decreases significantly with the increase of the friction angle, but the position of the underground water level has little effect on the damage range of the excavated surface.
【作者單位】： 長沙理工大學土木工程學院;約瑟夫傅里葉大學法國國家科學研究院3SR實驗室;
【基金】：國家自然科學基金項目(51308072,51678071) 湖南省教育廳科研項目(15C0052) 長沙理工大學土木工程優(yōu)勢特色重點學科創(chuàng)新性項目(15ZDXK13) 國家留學基金項目(國家建設高水平大學公派研究生項目)
【分類號】：U455.43

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本文編號：2094829