【摘要】 以重庆至长沙公路共和隧道为研究对象,研制出相似模型材料和配套试验设备,进行不同长度锚杆支护条件下的隧道超载试验。采用应变测量技术,测量两种不同长度锚杆支护工况下的隧道关键部位的应变值,据此分析围岩体在锚杆支护后的应力变化规律。通过模型材料室内试验,获取岩体相关计算参数,采用与模型试验相同的边界条件进行相应工况的有限元数值模拟,研究围岩体的变形量、应力场和锚杆轴力因锚杆长度不同而产生的变化。结果表明,模型试验和数值模拟反映围岩体应力和锚杆轴力因锚杆长度的不同而产生的变化是一致的。更多还原

【Abstract】 According to rock character of a certain soft rock tunnel of Chongqing to Changsha highway,similar model materials and supporting test equipments are developed to reproduce the whole process of progressive failure of surrounding rock under different supporting conditions.Through solving a series of technological matters in execution and installation and testing,by using the strain measuring technology,the strain of key parts of the surrounding rock under different supporting conditions are measured;according to this,the variability of the stress of surrounding rock are studied.By model materials laboratory determining the related parameters of rock mass,the numerical simulation are worked with the same boundary condition as the model test,according to this,the stress field and the deformation of the surrounding rock are studied;the variation of the axial force of the anchor bolt is studied.We compare the variation of stress of the surrounding rock and the variation of the axial force of the anchor bolt under different supporting conditions of the model test with the numerical simulation and draw the conclusion that the two processes coincide with each other.更多还原