雷达探测隧道壁后空洞的现场验证及空洞影响分析
发布时间：2019-03-01 13:47
【摘要】：针对王市岭隧道隧改路工程,采用探地雷达检测衬砌壁后空洞,并进行钻孔取芯验证,结果表明探地雷达用于壁后空洞检测可行且具有较高的可信度。为系统分析壁后空洞对隧道结构的影响,基于现场原位测试数据,建立了连拱隧道的三维快速拉格朗日有限差分模型。数值分析结果表明,拱顶、拱肩和边墙部位的空洞均会导致衬砌局部产生拉压应力集中,应力集中程度受空洞位置与尺寸的双重影响。在竖向地应力为主的条件下,拱肩部位的空洞对衬砌危害最大,易导致拱肩上侧部位出现较大的应力集中,因此在隧道壁后空洞病害检测时应重点考虑拱肩部位。
[Abstract]:Aiming at the tunnel modification project of Wangshiling tunnel, ground penetrating radar (GPR) is used to detect the hole behind the lining wall, and the coring test is carried out. The results show that the GPR is feasible and has high reliability in the detection of the hole behind the wall. A three-dimensional fast Lagrangian finite-difference model of multi-arch tunnel is established based on in-situ test data to systematically analyze the influence of post-wall cavity on tunnel structure. The results of numerical analysis show that the cavity in arch roof, arch shoulder and side wall will cause local stress concentration of lining, and the degree of stress concentration will be affected by the location and size of the cavity. Under the condition that the vertical ground stress is dominant, the cavity in the arch shoulder is the most harmful to the lining, and it is easy to cause the stress concentration to appear in the upper side of the arch shoulder. Therefore, the arch shoulder part should be taken into account in the detection of the cavity disease behind the tunnel wall.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;浙江公路水运工程咨询公司;
【分类号】：U457
本文编号：2432478
[Abstract]:Aiming at the tunnel modification project of Wangshiling tunnel, ground penetrating radar (GPR) is used to detect the hole behind the lining wall, and the coring test is carried out. The results show that the GPR is feasible and has high reliability in the detection of the hole behind the wall. A three-dimensional fast Lagrangian finite-difference model of multi-arch tunnel is established based on in-situ test data to systematically analyze the influence of post-wall cavity on tunnel structure. The results of numerical analysis show that the cavity in arch roof, arch shoulder and side wall will cause local stress concentration of lining, and the degree of stress concentration will be affected by the location and size of the cavity. Under the condition that the vertical ground stress is dominant, the cavity in the arch shoulder is the most harmful to the lining, and it is easy to cause the stress concentration to appear in the upper side of the arch shoulder. Therefore, the arch shoulder part should be taken into account in the detection of the cavity disease behind the tunnel wall.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;浙江公路水运工程咨询公司;
【分类号】：U457
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