CAJ | 학술논문

某长江隧道盾构机穿越江北大堤后,堤身出现裂纹且累计沉降较大,工程采用深层搅拌桩对堤身进行加固。为了检验深层搅拌桩对长江大堤堤身加固后的渗流稳定性,采用三维饱和-非饱和渗流有限元法,根据具体的工况建立了大堤的有限元渗流分析模型,并运用该模型分析了历史最高水位条件下加固后大堤的渗流性态。计算结果表明：深层搅拌桩消减水头的作用明显,土体渗透系数越大,深层搅拌桩的阻水作用越明显;堤身与堤基的渗透坡降均小于相应土体的允许渗透坡降,加固后长江大堤的渗流性态是正常的、安全的。
모장강수도순구궤천월강북대제후,제신출현렬문차루계침강교대,공정채용심층교반장대제신진행가고。위료검험심층교반장대장강대제제신가고후적삼류은정성,채용삼유포화-비포화삼류유한원법,근거구체적공황건립료대제적유한원삼류분석모형,병운용해모형분석료역사최고수위조건하가고후대제적삼류성태。계산결과표명：심층교반장소감수두적작용명현,토체삼투계수월대,심층교반장적조수작용월명현;제신여제기적삼투파강균소우상응토체적윤허삼투파강,가고후장강대제적삼류성태시정상적、안전적。
After the tunnel-shield-driving machine excavating through the north levee of Yangtze River, some cracks ap- peared in the levee, and the accumulative settlement of the levee was very large, so the levee was enhanced by deep mix- ing pile in the project. A three-dimensional saturated and non-saturated seepage finite element method is adopted here to check up the seepage stability of the enhanced Yangtze River Levee. Then, the finite-element seepage analysis model is established based on the actual project condition, and by using this model, the seepage behaviors of the enhanced levee under the condition of historical highest water level are analyzed. The calculation results show that the function of deep mixing piles for reducing water head is evident, and the larger the permeability coefficient of soil, the more evident is the water-tight action of deep mixing piles. The seepage gradients in levee body and foundation are less than the permissive permeability gradients in corresponsive soils, and the seepage behavior of the enhanced Yangtze River Levee is normal and safe.