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风积沙地层大跨公路隧道施工过程力学行为分析

, PP. 112-119

Keywords: 隧道工程,风积沙隧道,三维数值模拟,旋喷桩,台阶长度,荷载释放,沉降

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Abstract:

？采用三维数值模拟和现场监测的手段,对风积沙地层大跨公路隧道超前支护效果、工法参数优化、围岩压力释放和沉降发展规律进行分析。通过计算结果与监测数据的对比分析,得出了风积沙地层隧道开挖过程中围岩压力的变化形态、二次衬砌施作时机和最终形变荷载大小以及沉降发展等规律。分析结果表明:旋喷桩超前支护将掌子面潜在失稳区域控制在旋喷壳下部掌子面前方D/2范围(D为单洞开挖跨度14m);三台阶法施工台阶长度宜取(1/3~1/2)D;二次衬砌落后下台阶掌子面的距离宜取D/2;二次衬砌分担荷载较大,分担比例约为50%。

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