采动区桥体结构整体稳定机理研究

项目名称： 采动区桥体结构整体稳定机理研究

项目编号： No.51274192

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 夏军武

作者单位： 中国矿业大学

项目金额： 82万元

中文摘要： 我国煤炭开采已造成100多万公顷地表塌陷、每年还以6万多公顷的速度增加，在地表塌陷过程中引起地面建筑物、桥梁等地基基础和上部结构破坏、影响正常使用甚至引发安全事故。本课题针对采动区桥体结构整体稳定开展四个方面的研究：（1）采动区地表变形引起的桥体基础或地基土压力的变化规律，建立采动区桥体的应力边界；（2）研究采动区地基与桥体结构之间载荷、变形的传递规律，建立采动区浸水地基-桥体结构界面力学模型；（3）建立采动区地基-桥体结构协同作用力学模型，揭示采动区动态地表变形引起的桥体结构附加内力和附加变形的演化规律；（4）研究采动区桥体结构整体稳定的关键影响因素，揭示采动区桥体结构关键部位和整体稳定的机理。该项目的研究为评价动态地表变形对桥体结构的影响程度、为保证采动区新建及改造桥体结构的安全提供理论依据，具有重要的理论意义和社会效益。

中文关键词： 地表变形；地基与结构界面；土压力变化规律；协同作用；浸水地基

英文摘要： The exploiting of underground mine has caused more than 10 billion square meters of ground surface subsidence in China, which increase more than 60 million square meters per year. Foundation and up structure of buildings and bridges damage during the development of surface subsidence, which affect the normal use or even lead to security incidents. This theme focus on the global stability of bridge structures in mining subsidence area: (1) Study the pressure changes of bridge foundation or soil to establish the stress boundary of bridge structures; (2) Analyze the transfer law of load and deformation between the soil and bridge structure, derive the interface mechanical model between immersion soil and bridge structure; (3) Establish the interaction model of soil-bridge structure in mining subsidence area, reveal the evolution rules of the additional internal force and additional deformation of the bridge structure induced by the dynamic ground deformation; (4) Determine the key factors that influence the global stability of the bridge structure in the mining subsidence area, reveal the local and global stability mechanism of the bridge structure. The study of this project provides theoretical evaluation of the influence of dynamic ground deformation on the bridge structures, guarantees the safety and stability o

英文关键词： surface deformation；interface between foundation and structure；variation of soil pressure；coordinating action；water-immersion foundation