基于极限平衡理论的黄土隧道岩石压力计算及影响因素分析

IF 1.5 Q3 MECHANICS
Cheng Danjiang, Hua Junfeng, Zhu Jianguo, Ji Yang, Hu Zhaoguang
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引用次数: 0

摘要

隧道围护结构计算方法的研究是隧道工程支护结构设计中的一个关键问题。基于极限平衡理论,提出了一种计算浅埋黄土隧道围岩压力的方法。首先,在对黄土隧道围岩损伤模式研究和围岩压力现场测量结果的基础上,提出了黄土隧道的损伤模式,然后根据隧道方土体和侧楔的极限平衡条件,推导出适用于浅埋黄土隧道的围岩压力计算方法;该方法基本力学参数已知,只需确定破裂角β,提出了浅埋黄土隧道的破裂角计算模型。在破裂角计算模式中进行了三个假设,根据围岩滑面上的应力状态推导出了破裂角计算公式;将该方法获得的黄土隧道围岩压力与Taishaki既有松散体围岩压力理论、铁路隧道设计规范中深埋围岩压力公式、Beer-Baumann方法和谢家义方法四种方法进行了比较,以验证所用计算方法的正确性和有效性,并分析不同参数对围岩压力的影响。本文的创新之处在于,利用极限平衡理论推导了浅埋黄土隧道围岩压力的计算方法,并进一步提出了破裂角的计算公式。围岩压力随土体静土压力系数、侧压力系数、摩擦角和粘聚力的增加而减小,但静土压力对围岩压力的影响较大。随着矢跨比、隧道埋深和土体重量的增加,围岩压力随着隧道埋深的增加而达到峰值,围岩压力曲线先增大后减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calculation of Rock Pressure in Loess Tunnels Based on Limit Equilibrium Theory and Analysis of Influencing Factors
The research on the calculation method of tunnel envelope pressure is a key issue in the design of tunnel engineering support structure. Based on the limit equilibrium theory, this paper proposes a method to calculate the surrounding rock pressure in shallow buried loess tunnels. Firstly, based on the investigation of the damage mode of the loess tunnel surrounding rock and the field measurement results of the surrounding rock pressure, the damage mode of the loess tunnel is proposed, and then a method of calculating the surrounding rock pressure applicable to the shallow buried loess tunnel is derived according to the limit equilibrium condition of the tunnel square soil body and the side wedge; the basic mechanical parameters are known in this method, so only the rupture angle β needs to be determined, and the rupture angle calculation model in the shallow buried loess tunnel is proposed Three assumptions are made in the rupture angle calculation model, and the rupture angle calculation formula is derived according to the stress state on the slip surface of the surrounding rock; the pressure of the surrounding rock in the loess tunnel obtained by this method is compared with four methods, namely, the pressure theory of the surrounding rock in the existing loose body of Taishaki, the pressure formula of the deeply buried surrounding rock in the railroad tunnel design code, the Beer Baumann method, and the Xie Jiayi method, in order to verify the correctness and validity of the calculation method used, and to analyze the influence of different parameters on the surrounding rock pressure. The innovation of this paper lies in the derivation of a method for calculating the pressure in the surrounding rock of a shallow buried loess tunnel using the limit equilibrium theory, and also further proposes a formula for calculating the rupture angle. The pressure of surrounding rock decreases with the increase of static earth pressure coefficient, lateral pressure coefficient, friction angle and cohesion in soil, but the static earth pressure coefficient has a greater influence on the surrounding rock pressure. With the increase of sagittal span ratio, tunnel burial depth and soil weight, the surrounding rock pressure peaked with the increase of tunnel burial depth, and the surrounding rock pressure curve increased first and then decreased.
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来源期刊
CiteScore
1.70
自引率
8.30%
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