地下圆形隧道自由变形法的力法推导及例证

发布时间：2019-06-28 10:18

【摘要】：自由变形法是地下压力拱(隧道衬砌)结构内力计算的基本方法之一,适用于淤泥、流沙、完全塑形或软土介质等理想松软地层的水下隧道或软塑土层压力拱的内力计算。本文推导出整体圆形衬砌自由变形法内力计算的力法过程及其严格理论解,为后续发展的弹性抗力、椭圆变形、弹性铰等同类方法提供对比参考,以明确公式计算的理论来源,便于理论拓展。通过实例对比地铁浅埋衬砌压力拱自由变形法的理论计算、实测与数值模拟。结果显示,该方法进行整体式衬砌的内力计算过程明确,其理论结果可应用于狮子洋半岩半土复合地层及南京地铁砂性土及黏性土层衬砌计算,可为类似工程设计必要的理论包络值提供参考,具有一定的工程实用性。
[Abstract]:Free deformation method is one of the basic methods to calculate the internal force of underground pressure arch (tunnel lining) structure. It is suitable for calculating the internal force of underwater tunnel or soft plastic soil pressure arch in ideal soft strata, such as silt, quicksand, complete shaping or soft soil medium. In this paper, the force method process and its strict theoretical solution for calculating the internal force of the whole circular lining free deformation method are derived, which provides a comparative reference for the similar methods such as elastic resistance, elliptical deformation, elastic hinge and so on, so as to clarify the theoretical source of the formula calculation and facilitate the theoretical expansion. The theoretical calculation, measurement and numerical simulation of the free deformation method of subway shallow lining pressure arch are compared by an example. The results show that the internal force calculation process of integral lining is clear, and the theoretical results can be applied to the calculation of Lianyang semi-rock semi-soil composite strata and Nanjing subway sand soil and clay soil lining, which can provide reference for the necessary theoretical envelope value of similar engineering design, and has certain engineering practicability.
【作者单位】：北京交通大学土木建筑工程学院;中国中建设计集团有限公司;
【基金】：国家自然科学基金(51378051) 霍英东教育基金会优选资助(122009) 北京交通大学基本科研业务费(2011JBZ008)
【分类号】：U451

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