摘要
既有调研表明相当比例隧道存在超挖且回填不密实、空洞缺陷等质量问题.隧道围岩空洞易引起衬砌结构出现变形开裂等损伤,需要深入研究围岩空洞病害对隧道结构的影响机制.采用有限元数值模拟,分析隧道围岩空洞位置变化对隧道结构力学状态影响,进而评价存在围岩空洞的隧道结构安全性,得到结果:无围岩空洞情形的衬砌结构均处于受压状态,存在围岩空洞情形衬砌结构的空洞处截面出现拉应力,致使衬砌结构出现损伤;围岩空洞位于左右拱肩情形对隧道结构破坏作用大于空洞位于拱顶及拱肩情形,且两种情形衬砌出现最大拉应力位置均存在空洞,表明围岩空洞对隧道衬砌结构力学性能存在较大影响.
Existing studies show that a considerable proportion of tunnels have quality problems such as over-excavation, incomplete backfilling, and even void defects, and liable deformation and cracking of lining structures caused by surrounding rock voids of tunnels. Therefore, the influence mechanism of surrounding rock cavity disease on tunnel structure needs to be further studied. In this paper, finite element numerical simulation is used to analyze the influence of the change of tunnel surrounding rock cavity position on the mechanical state of tunnel structure, and then to evaluate the safety of tunnel structure with surrounding rock cavity. The following results are obtained: the lining structures without surrounding rock voids are in compressive state, and the cross section of the lining structures with surrounding rock voids has tensile stress, which results in the damage of the lining structures;the failure of tunnel structure caused by surrounding rock voids located at both arch spandrels is greater than that caused by the voids located at the arch vault and spandrel, and voids are located in the maximum tensile stress of section of tunnel lining with surrounding rock in both cases, which indicates that surrounding rock voids have great influence on the mechanical properties of tunnel lining structure.
作者
丁謇
刘伯成
莫振泽
杨湉
梅君
陈裕康
时文峰
吕伟华
DING Jian;LIU Bo-cheng;MO Zhen-ze;YANG Tian;MEI Jun;CHEN Yu-kang;SHI Wen-feng;LV Wei-hua(Wuxi Metro Group, Wuxi 214131, China;Shanghai Tunnel Engineering Company, Shanghai 200232, China;Nanjing Forestry University, Nanjing 210037, China)
出处
《南京工程学院学报（自然科学版）》
2019年第2期25-28,共4页
Journal of Nanjing Institute of Technology(Natural Science Edition)
关键词
围岩空洞
位置变化
衬砌
力学性能
数值计算
surrounding rock void
position variation
tunnel lining
mechanical properties
numerical calculation
