Calculation model of tunnel surrounding rock load considering moisture content and compactness in sandy pebble soil ground

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-08-27 DOI:10.1007/s10064-025-04450-5

Chunwei Zhang, Xiaojun Zhou, Kejia Yang, Yunpeng Hu

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引用次数: 0

Abstract

Sandy pebble soil presents issues such as loose surrounding rock and collapse during tunnel excavation due to its sensitivity to moisture content and compactness. This study combines indoor large-scale triaxial tests and numerical triaxial tests using particle discrete elements to calibrate the microstructure parameters of sandy pebble soil under different conditions. The relationship between shear strength parameters and moisture content and compactness is established. The barn effect principle is introduced to develop a method for calculating tunnel surrounding rock load, fully considering the influence of compactness and moisture content. Key findings include: (1) increased stress peak with higher compactness and lower moisture content, and increased internal friction angle with decreasing moisture content or increasing compactness; (2) identification of critical microstructure parameters affecting strength properties, such as particle contact modulus, friction coefficient, and porosity; (3) validation of the Janssen model for sandy pebble soil layer load calculation; (4) derivation of a formula for calculating the vertical load of sandy pebble soil tunnel surrounding rock, revealing the influence of compactness and moisture content on lateral pressure.

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砂卵石土地基中考虑含水率和密实度的隧道围岩荷载计算模型

砂卵石土因其对含水率和密实度的敏感性，在隧道开挖过程中存在围岩松动和塌方等问题。本研究结合室内大型三轴试验和数值三轴试验，采用颗粒离散元对不同条件下砂卵石土的微观结构参数进行了标定。建立了抗剪强度参数与含水率、密实度之间的关系。引入仓效应原理，建立了一种充分考虑密实度和含水率影响的巷道围岩荷载计算方法。主要发现有：(1)随着压实度和压实度的增大，应力峰值增大；随着压实度和压实度的减小，内摩擦角增大；(2)确定影响强度性能的关键微观结构参数，如颗粒接触模量、摩擦系数和孔隙率；(3)砂卵石土层荷载计算的Janssen模型验证；(4)推导了砂卵石土隧道围岩竖向荷载计算公式，揭示了密实度和含水率对侧压力的影响。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.