水下隧道覆土层安全厚度设计预测数学模型研究  

STUDY ON FORECASTING MATHEMATICAL MODEL OF SAFETY ROOF THICKNESS OF UNDERWATER TUNNEL

作　　者：程亚鹏[1] 凌贤长[2] 王宣青[3] 胡庆立[2] 

机构地区：[1]哈尔滨工业大学建筑设计研究院,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]南京大学地球科学系,江苏南京210000

出　　处：《岩石力学与工程学报》2005年第A01期5157-5163,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：黑龙江落户博士后科研基金资助项目（HR2001-093）

摘　　要：直接针对拟建的哈尔滨松花江隧道的安全运营过程，采用因子对目标函数影响的优化分析思想，将土体和衬砌均设定为各向同性均质的连续介质材料，考虑土体-衬砌结构相互作用，在假定的考虑各种不同工况的54种设计模型下，建立尽可能逼近实际问题的有限元数值分析模型，进行反复的模拟计算：据此研究各单项影响因子与隧道覆土层安全厚度之间的相关变化规律，并遴选影响隧道覆土层安全厚度的主要因子，包括硐径、水柱高、土体弹性模量、土的重度、土的泊松比、土的粘聚力、土的内摩擦角、衬砌弹性模量、衬砌厚度等。采用多元逐步回归分析的方法，建立了能够综合体现各主要影响因子共同作用的隧道覆土层安全厚度设计的预测数学模型。引用某一水下隧道工程算例，对所确定的隧道顶板安全厚度设计的预测数学模型进行可靠性与有效性检验。Aiming at the normal and safe work of Songhua river tunnel in Harbin which will be built recently, and using optimum analysis of a factorial experiment, the FEM models which approximating the actual problems on 54 different cases assumed are e^tablished and repetitive calculations are carried out to research the relations between various factors and the safety roof thickness of tunnel and to screen out the main affecting factors of safety roof thickness of tunnel; Considering soil-liner interaction, the soil and liner are assumed to be homogeneous, elastic-plastic, continuous, isotropy medium. It is found that the main affecting factors consist of hole diameter, altitude of water, elastic modulus of soil, unit weight of soil, Poisson＇s ratio of soil, cohesion of soil, angle of intemal friction of soil, elastic modulus of liner, thickness of liner. And then, a stepwise regression analysis method is adopted to obtain the forecasting mathematical model on the safety roof thickness of tunnel which is capable of synthetically embodying the combination action of all main affecting factors. The model＇s reliability and efficiency are verified by a calculation example of underwater tunnel.

关 键 词：隧道工程 覆土层安全厚度 预测数学模型 水下隧道 有限元数值模拟 多元逐步回归分析 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]