超深基坑对城市桥梁保护区域影响的初步探讨

针对城市建设中越来越广泛遇到的基坑问题,本文初步探讨了超深基坑开挖对城市桥梁安全保护区域的影响。目前我国多数城市所规定的安全保护区域为10～60 m,这是根据以往的工程经验所确定的。然而,随着我国经济建设的飞速发展,超深基坑不断涌现,综合工程经验与典型工程的数值模拟结果,本文认为超深基坑的影响范围可能超出现行有关规定为城市桥梁所确定的安全保护范围。为合理确定安全保护区域,建议应按照城市桥梁类型和重要程度的不同,根据基坑开挖等相关施工活动的扰动程度,分类划定城市桥梁安全保护区域。

Effect of deep excavation engineering on safety protective region of bridges

Many excavations appear in city construction,and effect of excavation on safety protective region of bridges has become a very important problem.The current safety protective region of bridges,determined by practical experiences,is usually 10~60 m in most cities of China.However,a few of deep excavations have appeared in recent years,and the current safety protective region may be not enough according to the practical engineering and numerical analysis.In order to properly determine the safety protective region,relationship between excavations and bridge styles should be studied,and the safety protective regions could be divided into different cases.