摘要
岩体裂隙对隧道掘进机(tunnel boring machine,简称TBM)滚刀破岩的施工效率和施工安全有显著影响。采用Monte Carlo方法建立了随机裂隙岩体离散元模型,通过单轴压缩试验模拟,构建了随机裂隙几何参数(倾角、直径、密度)与岩体力学性能(强度、弹性模量)的关系。在此基础上,模拟了TBM滚刀对随机裂隙岩体的破碎过程。结果表明:随机裂隙的倾角、直径、密度与岩体强度、弹性模量间存在明显的线性相关性,构建了裂隙岩体等效力学参数的多元线性回归预测模型;滚刀破岩过程中,岩体破碎比能随着裂隙倾角的增大而增大,随裂隙直径和密度的增大而先减小后增大;基于数值模拟结果,在东北工学院破岩力预测模型中引入岩体强度修正系数和破岩力修正系数,提出了考虑随机裂隙影响的岩体破岩力计算公式。
The fractures of rock significantly affect the efficiency and safety of rock breaking caused by tunnel boring machine(TBM)disc cutters.The present study established a discrete element model of randomly fractured rock using the Monte Carlo method,and investigated the correlation between random fractures geometry parameters(dip angle,fracture diameters and fracture density)and rock mechanical properties(strength and elastic modulus)through uniaxial compression simulation.Subsequently,the randomly fractured rock breaking by disc cutter was simulated using the discrete element method(DEM).The results demonstrated a clear linear correlation between the dip angle,diameter and density of random fractures with the strength and elastic modulus of rock,and a multiple linear regression prediction model for the mechanical properties of randomly fractured rocks was established.During construction simulation,the rock-breaking specific energy increased with an increase in fracture dip angle,while it initially decreases and then increases with increasing fracture diameter and density.Based on numerical simulation results,a correction factor for rock-breaking force was introduced into the Northeastern University rock-breaking force prediction model,thereby establishing a prediction formula that accounts for the influence of random fractures.
作者
苗日成
唐贝
祁飞
江志安
崔溦
MIAO Ri-cheng;TANG Bei;QI Fei;JIANG Zhi-an;CUI Wei(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Ground and Foundation Engineering,Sinohydro Foundation Engineering Co.Ltd.,Tianjin 301700,China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration,Tianjin University,Tianjin 300350,China)
出处
《岩土力学》
北大核心
2025年第S1期541-552,共12页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.52479131)
关键词
随机裂隙岩体
破岩
离散元
破岩力
TBM
random fractures
rock breaking
discrete element method
rock-breaking force
tunnel boring machine
