CAJ | 학술논문

以上海某实际隧道叠交段土层分布为背景，采用3维有限元方法对新建隧道分别以先下后上夹穿、下穿和上穿3种形式穿越既有隧道施工过程进行模拟，分析了在每种穿越形式下既有隧道的变形，给出了每种穿越形式下控制既有隧道变形的合理措施。研究结果表明，在盾构开挖过程中，既有隧道圆形断面不仅出现变形，而且也出现了扭转；新建隧道先下后上夹穿既有隧道的控制重点不是既有隧道最终沉降，而是开挖过程中出现的最大沉降值；下穿形式下，控制重点为既有隧道最终状态沉降曲线；上穿形式下，控制重点为既有隧道的大幅度上浮。同时对比了实测和模拟数据，验证了数值模拟的可靠性。研究成果为地铁叠交段穿越形式的选择、施工及既有隧道保护技术提供了一定理论基础。
이상해모실제수도첩교단토층분포위배경，채용3유유한원방법대신건수도분별이선하후상협천、하천화상천3충형식천월기유수도시공과정진행모의，분석료재매충천월형식하기유수도적변형，급출료매충천월형식하공제기유수도변형적합리조시。연구결과표명，재순구개알과정중，기유수도원형단면불부출현변형，이차야출현료뉴전；신건수도선하후상협천기유수도적공제중점불시기유수도최종침강，이시개알과정중출현적최대침강치；하천형식하，공제중점위기유수도최종상태침강곡선；상천형식하，공제중점위기유수도적대폭도상부。동시대비료실측화모의수거，험증료수치모의적가고성。연구성과위지철첩교단천월형식적선택、시공급기유수도보호기술제공료일정이론기출。
Based on an actual soil layer of tunnel overlapping section of Shanghai Metro, a 3-D finite element method is used to simulate the excavation process of three crossing forms of new tunnels, including crossing from upper and under of an existing tunnel, under crossing from an existing tunnel, and upper crossing from an existing tunnel. Settlement of the existing tunnel of each crossing form is analyzed. A reasonable measure is given to control settlement of the existing tunnel in each crossing form. The results show that there is not only deformation but also torsion of circular section of the existing tunnel. The key of a new tunnel crossing an existing tunnel from upper and under is to control the maximum settlement during the excavation process instead of final status settlement value of the existing tunnel. The key of a new tunnel under crossing an existing tunnel is to control the final status settlement curve of the existing tunnel. The key of a new tunnel upper crossing an existing tunnel is to control the floating upwards of the existing tunnel. Reliability of the numerical simulation is verified by comparison between the measured and simulated data. The results of this research provide a basis for choosing the form for a new tunnel crossing an existing tunnel, constructing new tunnels, and protecting existing tunnels.