考虑邻近建筑物影响的基坑支护结构受力响应分析

MECHANICAL BEHAVIORS OF SUPPORTING STRUCTURE OF FOUNDATION PIT WITH CONSIDERATION OF THE INFLUENCE OF ADJACENT BUILDING

为了深入了解临近建筑物对基坑支护结构受力响应的影响,通过学习前人的研究成果和基于自身经验采用三参数地基弹性梁模型,来考虑临近建筑物与支护结构间有限宽土压力、基底应力等的影响,根据支护结构受力特点,得到一种考虑临近建筑影响的支护结构计算分析模型;采用桩身离散的方法创建了支护结构的内力及其变形计算的矩阵表达式,得到一种半解析解答的方法;并根据工程实例对该方法进行计算验证,对建筑基底应力、距支护结构距离的影响规律进行了分析,验证了本方法的可行性,可为城镇建筑密集区域的基坑工程类似支护设计提供参考。

In order to better understand the mechanical behaviors of the supporting structure of the deep foundation pit,a tri-parameter foundation model is used,according to different stress patterns of the supporting structure,to build a computational analysis model with consideration of the influence of the adjacent building.In this computational analysis model,the additional stress caused by the adjacent building and the pressure of a certain width soil between the supporting structure and the adjacent building are considered.The matrix expressions for the internal forces and the deformations of the supporting structure are derived by using the pile discrete method and the matrix transfer method,and the semi-analytical solution for the supporting structure is obtained.For an excavation project,the influences of the additional stress caused by the adjacent building and the distance between the supporting structure and the adjacent building are analyzed,this method is verified,and it can be used for the design of this type of supporting projects in dense urban areas.