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。
The Terzaghi soil arching theory has been widely used in force calculations for tunnel structures, however, the theoretical explanation and experimental verification are not sufficient regarding the calculation width, lateral pressure coefficient and frictional coefficient, as well as for the soil arching pattern involved in the Terzaghi formula. Moreover, the technicians are not quite clear about the physical meaning of model parameters, and the selection of parameters is not accurate enough. In this context, the physical meaning of such parameters as the calculation width, lateral pressure coefficient and frictional coefficient, as well as the soil arching pattern, are analyzed here in detail, and the effect of parameters on the calculation results for soil pressure is presented based on a comparison of different parameters. The analysis shows the calculation width and soil arch pattern have a large impact on soil pressure, and the calculation width and soil arch pattern should be chosen based on measured data, or a wider calculation width and more conservative soil arch pattern should be taken when the scope of construction disturbance is relatively large; it is safer to choose active soil pressure coefficent; the friction angle also has a large impact on soil pressure; and it is recommended that the critical friction angle or half of the critical friction angle should be used to conduct the calculation.
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第2期55-60,共6页
Modern Tunnelling Technology
基金
国家自然科学基金项目(51074144)
关键词
太沙基土拱理论
隧道受力
计算宽度
土拱模式
Terzaghi soil arching theory
Force applied on tunnel
Calculation width
Soil arching pattern
