采煤沉陷区建筑物抗变形技术研究进展与展望

State-of-the-art of research on building anti-deformation technology in coal mining subsidence area

  • 摘要: 随着采煤沉陷区范围的不断扩大,矿山城市建设土地日益紧张,建筑物抗变形技术是解决采煤沉陷区工程建设利用的重要措施。但是由于采煤沉陷区地质条件的复杂多变、地表移动变形对建筑物的影响规律异常复杂及建筑结构形式多样等诸多困难,导致建筑物抗变形技术推广应用呈现起伏。首先,梳理了采煤沉陷区的地表变形特征、地表变形对建筑物的影响分类、地基与建筑物的相互作用机理、土与结构界面的本构模型、地基−基础−结构相互作用力学模型、建筑物抗变形技术及工程运用实例方面取得的成效和关键技术进展,分析了建筑抗变形的原理与技术应用。然后,总结了目前建筑物抗变形技术面临的难题与挑战:地表沉陷预测模型准确性有待提升;采煤沉陷区地基−基础−结构相互作用机制不明确;地基充填材料力学及变形特性尚不能满足工程建设地基用土的要求;基础类型、基础刚度及构造等对结构抗变形的影响有待进一步研究;结构耗能和吸收地表变形的新型建筑物抗变形技术待完善与研发。最后,针对现阶段我国建筑物抗变形技术应用面临的难题和挑战,提出了一套基于物理模拟试验平台研发、框架结构抗变形的规律及机理、共同作用力学模型、框架结构抗变形技术及自适应变形技术的研究与设计方法。

     

    Abstract: With the expansion of coal mining subsidence area, the construction land of mining city is increasingly tight, and the anti-deformation technology of buildings is an important measure to solve the problem of construction and utilization of coal mining subsidence area. However, due to the complex and changeable geological conditions in coal mining subsidence area, the extremely complex influence law of surface deformation on buildings and the various forms of building structures, the application of building anti-deformation technology had fluctuated. Firstly, the surface deformation characteristics of coal mining subsidence area, the classification of the impact of surface deformation on buildings, the interaction mechanism between foundation and building, the constitutive model of soil-structure interface, the mechanical model of soil-foundation-structure interaction, the achievements and key technical progress of building anti-deformation technology and engineering application examples are reviewed. The principle and technical application of building deformation resistance are analyzed. Then, it summarizes the difficulties and challenges facing the current building deformation resistance technology: The accuracy of surface subsidence prediction model needs to be improved; The mechanism of soil-foundation-structure interaction in coal mining subsidence area is not clear. The mechanical and deformation characteristics of foundation filling materials can not meet the requirements of foundation soil for engineering construction. The effects of foundation type, foundation stiffness and structure on structural deformation resistance need to be further studied. Improvement and development of new building deformation resistance technology for structural energy dissipation and absorption of surface deformation. Finally, a set of research and design methods based on the research and development of physical simulation test platform, the law and mechanism of deformation resistance of frame structure, the mechanical model of joint action, the deformation resistance technology of frame structure and the adaptive deformation technology are put forward for the difficulties and challenges faced by the application of deformation-resistant technology of China’s buildings at the present stage.

     

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