密实砂土及硬黏土中圆形隧道的竖向支护压力

发布时间：2018-01-09 13:12

本文关键词：密实砂土及硬黏土中圆形隧道的竖向支护压力　出处：《岩石力学与工程学报》2014年04期 　论文类型：期刊论文

【摘要】：在Terzaghi理论假定的基础上,考虑圆形隧道侧压力系数及洞身范围斜向滑裂面作用,根据极限平衡法建立圆形隧道竖向支护压力的一般表达式,适用于密实砂土及硬黏土地层。该式表明圆形隧道的竖向支护压力随侧压力或侧压力系数λ的增大而减小,当λ=1时可得最小支护压力。为求解竖向支护压力,提出圆形隧道侧压力系数λ的计算方法,建立支护压力与衬砌刚度、地层刚度等因素的定量关系,表明随衬砌厚度的减小或地层弹性抗力系数的增大,侧压力系数增大,而竖向支护压力减小。通过对比表明,本文方法计算值与极限分析上限法、既有试验结果较接近且偏于安全,不仅适用于浅埋隧道,也适用于深埋隧道,且本文方法比极限分析上限法显著简化。
[Abstract]:Based on Terzaghi theory on the assumption of circular tunnel, considering the lateral pressure coefficient and the tunnel effect of oblique slip surface, a general expression is established according to the circular tunnel vertical support pressure limit equilibrium method is suitable for dense sand and hard clay layer. It is shown that the circular tunnel vertical support pressure with the increase of lateral pressure or a lateral pressure coefficient decreases, when =1 can get the minimal support pressure. In order to solve the vertical support pressure, put forward calculation method of circular tunnel side pressure coefficient, the establishment of supporting pressure and lining stiffness, the quantitative relationship between the formation of stiffness factors, that increases with the decrease of the thickness of the lining or the formation of elastic resistance coefficient, lateral pressure coefficient increasing, while the vertical support pressure decreases. Through comparison, the calculated values with the upper bound limit analysis method, which is close to the test results and on the safe side, not only suitable for shallow The tunnel is also suitable for deep buried tunnel, and the method is simpler than the upper bound method of limit analysis.

【作者单位】：北京城建设计研究总院有限责任公司;
【分类号】：U451
【正文快照】： 1引言直接作用在隧道支护上的围岩压力(或支护压力)是采用荷载结构法进行隧道结构设计的基本依据。密实砂土及较硬黏土地层中的隧道当埋深较大时可考虑拱效应,考虑拱效应的公式有岩(土)柱理论[1]、Terzaghi公式[2]、谢家p斯絒3]及笔者提出的公式[4],上述公式主要针对矩形

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