太沙基土拱理论计算隧道受力存在的问题
发布时间：2018-08-04 20:58
【摘要】：太沙基土拱理论已广泛应用在隧道结构的受力计算中,但太沙基公式中涉及的计算宽度、侧压力系数和摩擦系数以及土拱模式尚未得到充分的理论解释和实验验证,工程技术人员对模型参数的物理意义认识不够清楚,参数选择不够准确。文章详细分析了计算宽度、侧压力系数和摩擦系数以及土拱模式的物理意义,对比了这些参数之间的异同,给出了选择不同的参数对土压力计算结果的影响。分析计算表明:计算宽度和土拱模式的选择对土压力具有较大的影响,应该根据实测结果选择计算宽度和土拱模式或者在施工扰动范围较大时选择更大的计算宽度和更保守的土拱模式;选取主动土压力系数是偏于安全的;摩擦角的选取对土压力也有较大影响,建议选择临界摩擦角或者临界摩擦角的一半进行计算。
[Abstract]:The soil arch theory of Taishaji has been widely used in the stress calculation of tunnel structure, but the calculation width, the coefficient of lateral pressure, the coefficient of friction and the model of soil arch have not been fully explained and verified by experiments. The physical meaning of the model parameters is not clear enough, and the selection of the parameters is not accurate enough. In this paper, the physical meaning of calculating width, coefficient of lateral pressure, coefficient of friction and model of soil arch are analyzed in detail, the similarities and differences between these parameters are compared, and the influence of choosing different parameters on the calculation results of earth pressure is given. The analysis and calculation show that the calculation width and the selection of soil arch mode have great influence on the earth pressure. The calculated width and the soil arch mode should be selected according to the measured results, or the wider calculation width and the more conservative soil arch mode should be selected when the construction disturbance range is large, and the active earth pressure coefficient should be selected for safety. The selection of friction angle also has great influence on the earth pressure. It is suggested that the critical friction angle or half of the critical friction angle be chosen for calculation.
【作者单位】： 中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金项目(51074144)
【分类号】：U451
本文编号：2165113
[Abstract]:The soil arch theory of Taishaji has been widely used in the stress calculation of tunnel structure, but the calculation width, the coefficient of lateral pressure, the coefficient of friction and the model of soil arch have not been fully explained and verified by experiments. The physical meaning of the model parameters is not clear enough, and the selection of the parameters is not accurate enough. In this paper, the physical meaning of calculating width, coefficient of lateral pressure, coefficient of friction and model of soil arch are analyzed in detail, the similarities and differences between these parameters are compared, and the influence of choosing different parameters on the calculation results of earth pressure is given. The analysis and calculation show that the calculation width and the selection of soil arch mode have great influence on the earth pressure. The calculated width and the soil arch mode should be selected according to the measured results, or the wider calculation width and the more conservative soil arch mode should be selected when the construction disturbance range is large, and the active earth pressure coefficient should be selected for safety. The selection of friction angle also has great influence on the earth pressure. It is suggested that the critical friction angle or half of the critical friction angle be chosen for calculation.
【作者单位】： 中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金项目(51074144)
【分类号】：U451
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，本文编号：2165113
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