非圆形隧洞解析应力空间分布特征  

Spatial Distribution Characteristics of Analytical Stress on a Non-Circular Tunnel

作　　者：杜小洲 胡志平[2] 王振林 安学旭 陶磊 DU Xiao-zhou;HU Zhi-ping;WANG Zhen-lin;AN Xue-xu;TAO Lei(Hanjiang-to-Weihe River Valley Water Diversion Project Construction Co.,Ltd.,Xi an 710024,China;School of Civil Engineering,Chang an University,Xi an 710061,China)

机构地区：[1]陕西省引汉济渭工程建设有限公司,西安710024 [2]长安大学建筑工程学院,西安710061

出　　处：《科学技术与工程》2022年第27期12175-12182,共8页Science Technology and Engineering

基　　金：陕西省自然科学基础研究计划-引汉济渭联合基金(2021JLM-49);峨汉高速工程科研专项(LH-HT-45)。

摘　　要：隧洞开挖过程中快速获取掌子面附近围岩空间应力分布信息对其灾变防控至关重要。基于收敛约束法,将非圆形隧洞围岩解析解与可视化软件Tecplot相结合,提出一种高效、直观的隧洞解析应力空间分布呈现方法,利用该方法对引汉济渭岭北深埋隧洞掌子面附近的空间应力分布特征进行了分析,并在基础上探究了初始主应力场水平倾角对隧洞空间应力分布特征的影响。结果表明:沿隧洞纵向逐渐远离掌子面时,隧洞环向应力集中分布呈现出应力集中大小增长区、应力集中区域扩展区与应力集中区域稳定区三阶段特征。对于深埋硬岩隧洞,沿隧洞纵向远离掌子面的三阶段分布区间分别为0.5D(D为隧洞最大洞径)范围内,0.5D~2.0D范围之间,2.0D范围外。此外,初始主应力场水平倾角对隧洞应力分布影响主要体现在环向分布方位,而对其纵向分布影响较小。During tunnel excavation, quickly obtaining the spatial stress distribution information of surrounding rock near the tunnel working face is crucial for its disaster prevention and control. Based on the convergence constraint method, an efficient and intuitive spatial distribution method of tunnel analytical stress was explored by combining the analytical solution of a non-circular tunnel surrounding rock with the visualization software Tecplot. The spatial stress distribution characteristics near the deep buried tunnel working face of the North of Qinling Mountains for the Hanjiang to Weihe river valley water diversion project was analyzed by applying the proposed method. Moreover, the influence of the horizontal inclination of the initial principal stress field on the spatial stress distribution of the tunnel was studied. Results show these as follows. When it is gradually away from the working face along the longitudinal direction of the tunnel, the circumferential stress concentration distribution presents three stages: the rapid growth zone of stress concentration gradient, the expansion zone of stress concentration and the stability zone of stress concentration. For the deep buried hard rock tunnel, the three-stage distribution ranges away from the working face along the longitudinal direction of tunnel are 0~0.5D(D is maximum tunnel diameter), 0.5D~2.0D and outside 2.0D, respectively. In addition, the horizontal inclination of the initial principal stress field has a great influence on the circumferential stress distribution of the tunnel, but has little influence on its longitudinal distribution.

关 键 词：隧道工程 收敛约束法 非圆形隧洞 空间应力分布 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]