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...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。展开更多
The seismic response characteristics of underground structures in saturated soils are investigated.A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to sim...The seismic response characteristics of underground structures in saturated soils are investigated.A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to simulate the dynamic behavior of saturated soils.The accuracy of the model is validated using a classic example in literature.The performance of the model is verified by its application on simulating the seismic response characteristics of a subway station built in saturated soils.The merits of the model are demonstrated by comparing the difference of the seismic response of an underground structure in saturated soils between using the fully coupling model and a single-phase medium model.The study finds that the fully coupling model developed herein can simulate the dynamic response characteristics of the underground structures in saturated soils with high accuracy.The seismic response of the underground structure tends to be underestimated by using the single-phase medium model compared with using the fully coupling model,which provides a weaker confining action to the underground structure.展开更多
基金国家重点基金课题:“环渤海滨海地球关键带地质结构和岩相古地理研究(42293261)”中国地质调查局项目:“津冀沿海资源环境承载力调查(DD20189506)”+2 种基金中国地质调查局项目:“黄渤海海岸带重点生态保护修复区综合地质调查(DD20211301)”自然科学基金项目:“渤海湾全新世海面标志点研究与变化历史重建(41372173)”“渤海湾西北岸4 ka BP前后古环境重建(41806109)”。
文摘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。
基金National Natural Science Foundation of People’s Republic of China under Grant Nos.51178011 and 51778386the Key Fundamental Study Development Project of People’s Republic of China under Grant No.2011CB013602。
文摘The seismic response characteristics of underground structures in saturated soils are investigated.A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to simulate the dynamic behavior of saturated soils.The accuracy of the model is validated using a classic example in literature.The performance of the model is verified by its application on simulating the seismic response characteristics of a subway station built in saturated soils.The merits of the model are demonstrated by comparing the difference of the seismic response of an underground structure in saturated soils between using the fully coupling model and a single-phase medium model.The study finds that the fully coupling model developed herein can simulate the dynamic response characteristics of the underground structures in saturated soils with high accuracy.The seismic response of the underground structure tends to be underestimated by using the single-phase medium model compared with using the fully coupling model,which provides a weaker confining action to the underground structure.