CAJ | 학술논문

江河堤岸的地层变形及整体稳定性是过江盾构隧道施工时关注的重点。文章基于南京纬三路过江通道江北堤岸盾构段(S线)的工程背景，利用有限差分软件对施工过程进行了数值模拟，分析了盾构掘进对大堤地层沉降变形及整体稳定性的影响，并比较了不同注浆效果、堤岸坡度和隧道埋深情况下地层沉降变形及稳定性的差异。研究结果表明：地表沉降最大值在堤岸顶部中央位置，迎水面边坡产生沿隧道纵向位移，最大位移发生在堤岸边坡中点附近；盾构掘进使迎水面边坡安全系数降低，在盾构通过边坡前半段时，安全系数减小最显著；注浆效果、堤岸坡度和隧道埋深对堤岸沉降和边坡稳定影响具有差异性，注浆效果对地层沉降影响较大，隧道埋深次之，坡度影响很小；而坡度对于岸坡安全系数影响最大，注浆效果影响最小。
강하제안적지층변형급정체은정성시과강순구수도시공시관주적중점。문장기우남경위삼로과강통도강북제안순구단(S선)적공정배경，이용유한차분연건대시공과정진행료수치모의，분석료순구굴진대대제지층침강변형급정체은정성적영향，병비교료불동주장효과、제안파도화수도매심정황하지층침강변형급은정성적차이。연구결과표명：지표침강최대치재제안정부중앙위치，영수면변파산생연수도종향위이，최대위이발생재제안변파중점부근；순구굴진사영수면변파안전계수강저，재순구통과변파전반단시，안전계수감소최현저；주장효과、제안파도화수도매심대제안침강화변파은정영향구유차이성，주장효과대지층침강영향교대，수도매심차지，파도영향흔소；이파도대우안파안전계수영향최대，주장효과영향최소。
Stratum deformation and the overall stability of river embankments are key points in river-crossing shield tunnelling. Using the north river embankment section of the Nanjing Weisan Road river-crossing tunnel as an example, a numerical simulation of the construction process was made using finite difference software. This paper analyzes the influences of shield tunnelling on stratum deformation and overall stability of embankments, and compares settlement and stability differences under different grouting effects, slope coefficients and buried depths. The results show that:1) the maximum settlement occurs at the center point of the top of the embankment and the maximum longitudinal displacement of the slope towards the water occurs near the midpoint of the slope;2) the safety factor decreases with shield tunnelling at the slope towards the water, for which the trend is most significant at the front half of the slope; 3) the influence of the grouting effect on embankment settlement is significant, less so regarding the buried depth and minimal regarding the slope coefficient; and 4) the slope coefficient has the greatest influence on slope stability while it has the smallest influence on the grouting effect.