摘要
将三维激光扫描技术应用于温州绕城高速公路南山隧道施工期的变形量测中。首先相隔4个工日进行2次扫描得到2期隧道点云数据,通过对点云数据分析和处理得到隧道初期支护段空间变形场,从中提取断面的拱顶沉降作为隧道围岩参数反演分析的实测值。然后建立隧道三维有限元模型对围岩弹性模量、黏聚力和内摩擦角进行反演分析。结果表明:三维激光扫描监测可以快速获取隧道空间变形场,为隧道围岩参数反演分析提供足够的有效数据,弥补了传统监测方法的不足;当围岩弹性模量为1 GPa,黏聚力为200 k Pa,内摩擦角为28°时拱顶沉降模拟计算值与实测值吻合度最高。反演所得围岩参数均低于隧道设计阶段根据地质勘查报告的估算值,可用于隧道支护参数动态设计,降低工程成本。
The three-dimensional laser scanning technology was applied to the deformation measurement of Nanshan Tunnel in W enzhou Circumcity Expressway during construction.Firstly,the point cloud data of two phase tunnel were obtained by scanning twice every four working days,the spatial deformation f ield of the initial lining section of the tunnel was obtained by processing and analyzing the point cloud data,from which the vault settlement of the section was extracted as the measured value of the inversion analysis for tunnel surrounding parameters.Then a three-dimensional f inite element model of tunnel was established to inversely analyze the elastic modulus,cohesion and internal friction angle of surrounding rock.The results show that three-dimensional laser scanning monitoring can quickly acquire the spatial deformation f ield of tunnel,provide enough effective data for inversion analysis of tunnel surrounding rock parameters,and make up for the shortcomings of traditional monitoring methods,when the elastic modulus of surrounding rock is 1 GPa,the cohesion is 200 kPa and the internal friction angle is 28°,the simulated calculation value of vault settlement is in the best agreement with the measured value.The parameters of surrounding rock obtained by inversion are lower than those estimated by geological survey report in tunnel design stage,which can be used for dynamic design of tunnel support parameters and reduce engineering cost.
作者
杨建群
詹建勇
方良斌
史培新
赵宇
YANG Jianqun;ZHAN Jianyong;FANG Liangbin;SHI Peixin;ZHAO Yu(Zhejiang Wenzhou Shenhai Expressway Co.Ltd.,Wenzhou Zhejiang 325000,China;Institute of Disaster Prevention Engineering,Zhejiang University,Hangzhou Zhejiang 310058,China;School of Rail Transportation,Soochow University,Suzhou Jiangsu 215000,China)
出处
《铁道建筑》
北大核心
2019年第8期92-95,共4页
Railway Engineering
基金
浙江省自然科学基金(LY16D020002)
关键词
公路隧道
三维激光扫描
数值计算
围岩参数
反演分析
Highway tunnel
3D laser scanning
Numerical calculation
Surrounding rock parameter
Inversion analysis
