基于等效周长法研究隧道衬砌水压力荷载及内力

发布时间：2018-04-17 04:18

本文选题：隧道 + 水荷载　；参考：《铁道科学与工程学报》2015年03期

【摘要】：为研究方形隧道断面衬砌水压力及内力,利用等效周长替代法,将方形隧道断面转变成圆形隧道断面,并运用轴对称解析法与有限差分FLAC3D分别计算在不同衬砌渗透系数、不同注浆半径和不同衬砌厚度情况下,隧道衬砌水压力、渗透量、内力、偏心距以及安全系数。结果表明:轴对称解析法的渗透量和水压力与有限差分数值计算法的很接近;在不透水情况下,水压力不进行折减;通过控制排水、减小衬砌渗透系数、适当增大围岩注浆或适当增大衬砌厚度可以调节衬砌水压力、偏心距与安全系数;衬砌厚度对边角处安全系数影响大;以设计水荷载为正算,施工监测水压力为反算,在施工过程中,检验并修正水荷载。
[Abstract]:In order to study the water pressure and internal force of the lining of square tunnel section, the equivalent circumference substitution method is used to transform the section of square tunnel into round section of tunnel, and the coefficient of permeability in different lining is calculated by using axisymmetric analytical method and finite difference FLAC3D, respectively.Under different grouting radius and different lining thickness, tunnel lining water pressure, permeability, internal force, eccentricity and safety factor.The results show that the permeability and water pressure of the axisymmetric analytical method are very close to those of the finite difference numerical method, the water pressure is not reduced in the case of impermeable water, and the permeability coefficient of the lining is reduced by controlling the drainage.The water pressure and eccentricity and safety factor of lining can be adjusted by increasing the grouting of surrounding rock or increasing the thickness of lining properly; the thickness of lining has great influence on the safety factor at the edge and corner; the design water load is taken as positive calculation, and the water pressure of construction monitoring is inversely calculated.Check and correct water load during construction.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【分类号】：U45

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