CAJ | 학술논문

盾构掘进过程中隧道掘进面附近水头分布是掘进面稳定分析的重要因素.为此,基于固定在隧道开挖面上参照坐标系,推导了考虑盾构掘进速度、土体的渗透系数以及土体贮水系数的稳态地下水流动偏微分方程.通过伽辽金有限元法,推导了考虑盾构掘进速度的二维稳态渗流有限元方程,编制了有限单元数值分析程序,计算了稳态地下水流条件下,地下水参数和盾构掘进速度的变化对隧道掘进面附近水头场分布的影响.结果发现,在低渗透性土层中进行隧道开挖,掘进速度的增加导致隧道掘进面附近总水头梯度显著增加.水头场的重新分布导致了作用在隧道掘进面的渗透力增加.将考虑盾构掘进速度的数值分析结果与相关实验数据相比较,两者取得较好的一致性.
순구굴진과정중수도굴진면부근수두분포시굴진면은정분석적중요인소.위차,기우고정재수도개알면상삼조좌표계,추도료고필순구굴진속도、토체적삼투계수이급토체저수계수적은태지하수류동편미분방정.통과가료금유한원법,추도료고필순구굴진속도적이유은태삼류유한원방정,편제료유한단원수치분석정서,계산료은태지하수류조건하,지하수삼수화순구굴진속도적변화대수도굴진면부근수두장분포적영향.결과발현,재저삼투성토층중진행수도개알,굴진속도적증가도치수도굴진면부근총수두제도현저증가.수두장적중신분포도치료작용재수도굴진면적삼투력증가.장고필순구굴진속도적수치분석결과여상관실험수거상비교,량자취득교호적일치성.
The head distribution around the tunnel face is an important factor in stability analysis of tunnel face in shield advance. Based on a frame of reference that advances together with the tunnel heading, the steady seepage flow differential equations were derived in consideration of shield advance velocity, the ground permeability and the storativity. Moreover, the finite element equation was deduced by the weighted residual-Galerkin method and the finite element numerical program was written to measure the effect of shield advance velocity and the groundwater parameters on the head distribution around the tunnel face. The results show that the head gradients around the tunnel face are increased greatly especially in poor permeable ground with the increase of advance velocity. The head redistribution causes the increase of the seepage force on the tunnel face. The result of numerical analysis in consideration of shield advance velocity is consistent with the experimental data.