下穿隧道开挖区域边坡变形现场检测与数值模拟对比分析

摘要

Soil nailing wall is one of the most effective supporting structures that can ensure the slope stability during the excavation of the tunnels which are underneath some existing buildings .Taking a certain tunnel engineering as the re-search subject ,the monitoring schemes and the distribution of the sensors were determined according to the conditions of the tunnel .The changing law of the vertical settlement and horizontal displacement of the excavation surface were ana-lyzed according to the in-situ monitoring data .In addition ,the FEM software was adopted to simulate the slope excava-tion ,the simulation results were then compared with the measured data .The results indicate that the measured results are slightly larger than those of the numerical simulation ,but they both fall in the range of allowable deformation value .The reliability and rationality of the numerical simulation result is verified .This study can provide theoretical basis and refer-ence for similar projects .%土钉墙支护是确保下穿隧道开挖区域边坡稳定性的有效方法之一，以某下穿隧道开挖区域工程为研究背景，根据工程实际确定现场监测方案和测点布设，结合现场监测成果，分析该开挖面坡顶竖向沉降和水平位移的变化规律，并利用有限元软件对边坡开挖进行数值模拟，且与实测结果进行对比分析。结果表明：实测结果略大于数值模拟结果，但均满足容许变形量要求，验证了数值模拟计算结果的可靠性与合理性，为类似工程提供理论依据，具有较强的参考价值。