發(fā)布時(shí)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(xué)報(bào)》2017年08期

【摘要】：利用數(shù)值模擬技術(shù)對(duì)地下水滲流情況下盾構(gòu)隧道開挖面的滲流場(chǎng)進(jìn)行模擬,獲得了隧道開挖面周邊各節(jié)點(diǎn)的孔隙水壓力�；跇O限分析上限定理,利用各節(jié)點(diǎn)孔隙水壓力計(jì)算出隧道開挖面上限破壞機(jī)制中的孔隙水壓力功率,并將其視為一個(gè)外力功率代入虛功率方程中,構(gòu)建出考慮滲流影響的開挖面安全系數(shù)目標(biāo)函數(shù)。通過非線性序列二次規(guī)劃法對(duì)該目標(biāo)函數(shù)進(jìn)行優(yōu)化計(jì)算,得到開挖面安全系數(shù)上限解。利用強(qiáng)度折減法驗(yàn)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(gòu)隧道工程實(shí)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(shù)隨土體黏聚力、摩擦角、開挖面支護(hù)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(duì)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(xué)土木工程學(xué)院;約瑟夫傅里葉大學(xué)法國國家科學(xué)研究院3SR實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51308072,51678071) 湖南省教育廳科研項(xiàng)目(15C0052) 長沙理工大學(xué)土木工程優(yōu)勢(shì)特色重點(diǎn)學(xué)科創(chuàng)新性項(xiàng)目(15ZDXK13) 國家留學(xué)基金項(xiàng)目(國家建設(shè)高水平大學(xué)公派研究生項(xiàng)目)
【分類號(hào)】：U455.43

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