针对暗挖海底隧道开挖面围岩稳定性问题,总结极限分析上限法、楔形体模型、二维对数螺旋线模型以及条分法模型4种理论解析模型,并考虑了海底隧道开挖面滑移体上部地层压力等因素,对理论解析公式进行了修正;同时结合一工程实例,将数值模拟方法与解析模型进行了对比分析。结果表明:与数值模拟结果相比,4种理论解析模型在求解极限支护力时都偏于安全和保守,其中,极限分析上限法精确度最高,其次是楔形体模型,再次是二维对数螺旋线模型和条分法模型。
Abstract
Aimed at the problem of subsea tunnel face stability, four analytical models including limit analysis upper bound method, wedge analysis, two-dimensional logarithmic spiral model and slice method for estimating the support pressure required for the face stability were summarized. With considering the pressure of overlying strata, theoretical analytical formulas were modified. Combined with the results of a practical example, the results of the numerical simulation and the analytical formulas were compared and analyzed. The results show that four analytical models were all on the safe side; and the limit analysis upper bound method model has the highest accuracy, followed by wedge analysis model, two-dimensional logarithmic spiral model and slice method.
关键词
隧道工程 /
海底隧道 /
解析模型 /
开挖面 /
围岩稳定性
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Key words
tunnel engineering /
subsea tunnel /
analytical model /
tunnel face /
surrounding rock stability
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中图分类号：
U451.2
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脚注
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基金
国家自然科学基金项目(51134001);铁道部科技开发项目(2011G019-A);中国博士后科学基金项目(2012M510491)
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