土工基础

土工基础 ›› 2026, Vol. 40 ›› Issue (4): 737-740.

• 测试技术 • 上一篇    下一篇

基于数值反分析的砂卵石强度和模量参数研究

卞士海1,2，蔡国成1，郭 云1，常金源1，武维勇1   

  1. （1.浙江省工程勘察设计院集团有限公司，浙江宁波 315012；2.浙江省城市盾构隧道安全建造与智能养护重点实验室，杭州 310015）
  • 收稿日期:2024-07-03 修回日期:2024-07-29 出版日期:2026-08-30 发布日期:2026-08-26
  • 作者简介:卞士海(1987-)，男，博士（后），高级工程师，研究方向为土体力学特性的试验、本构模拟以及数值模拟。
  • 基金资助:
    国家自然科学基金(No.52008214);浙江省城市盾构隧道安全建造与智能养护重点实验室开放基(No.ZUCC-UST-23-06)

Strength and Modulus Parameter of Sandy Cobble Soil Using Numerical Back Analysis

BIAN Shihai1,2, CAI Guocheng1, GUO Yun1, CHANG Jinyuan1， WU Weiyong1   

  1. (1.Zhejiang Engineering Survey and Design Institute Group Co. Ltd., Ningbo 315012；
    2.Key Laboratory of Safe Construction and Zhejiang Provincial Intelligent Maintenance for Urban Shield Tunnels, Hangzhou 310015)
  • Received:2024-07-03 Revised:2024-07-29 Online:2026-08-30 Published:2026-08-26

摘要： 砂卵石土由于岩性不均，结构松散，颗粒较大，通过室内外试验给出强度和模量参数成本较高并且难度较大，给工程设计带来了挑战。基于加载至破坏的平板载荷试验，使用塑性硬化模型，通过FLAC3D反分析砂卵石强度和模量参数，并与摩尔库伦模型进行了比较。数值反分析结果表明，塑性硬化模型相比摩尔库伦模型更适合砂卵石材料刚度降低效应，砂卵石强度指标中的内摩擦角很高，可达50°~60°，其弹性模量也很大，大约在200~300 MPa之间，而设计中给出的值远低于这些强度指标。建议设计时适当提升相关强度和模量参数值，使用数值反分析作为砂卵石参数确定辅助手段。


关键词: 砂卵石, 反分析, 数值模拟, 模量参数, 承载力, 平板载荷试验

Abstract: The mechanical characterization of sandy cobble mixtures is challenging due to their heterogeneous lithology, loose structure, and large particle size. Obtaining reliable strength and stiffness parameters through conventional laboratory and in-situ tests is both technically difficult and costly, often leading to significant uncertainty in engineering design. In this study, strength and modulus parameters of sandy cobble soils were back-calculated using a plastic-hardening constitutive model in FLAC3D, based on plate load tests performed to failure. The results were compared with those obtained using the Mohr–Coulomb model. Numerical back-analysis indicates that the plastic-hardening model better captures the stiffness-degradation behavior characteristic of sandy cobble materials. The inferred internal friction angle is notably high, typically ranging from 50° to 60°, and the elastic modulus is also substantial, on the order of 200~300 MPa—significantly exceeding the parameter values commonly adopted in engineering design. It is therefore recommended that design practice appropriately increase the strength and stiffness parameters for sandy cobble soils, and that numerical back-analysis be used as an effective supplementary approach for parameter determination.

Key words: Sandy Cobble, Back Analysis, Numerical Simulation, Modulus Parameter, Bearing Capacity, Plate Load Test

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