潘静杰,朱春柏,刘伟,房凯,刘念武

• 1:浙江理工大学建筑工程学院
• 2:中车建设工程有限公司
• 3:苏州中车建设工程有限公司
• 4:山东科技大学能源与矿业工程学院

摘要(Abstract)：

工程实践表明，外基坑宽度和坑中坑会影响基坑坑底滑裂面的形成方式，因此，经典朗肯土压力理论的假设建立在半无限空间土体的基础上不再适用。基于极限平衡理论和微分体受力平衡方法，考虑土体黏聚力和围护结构与滑动土体摩阻力，推导了宽基坑和窄基坑坑中坑的被动土压力理论计算公式。通过具体算例对比了宽基坑与窄基坑在坑中坑条件下被动土压力大小的变化趋势。结果表明，考虑摩擦力条件下的被动土压力大于未考虑摩擦力的被动土压力；无论宽基坑还是窄基坑，有内坑的被动土压力小于无内坑时的被动土压力；无内坑时，外基坑宽度的增加导致被动土压力减小，而在有内坑的情况下，外基坑宽度的增加，反而增大被动土压力；在窄基坑中，随着内坑位置的移动，土压力先变小后增大，且内坑平面尺寸的增大导致土压力逐渐减小。因此，内坑的存在将降低坑中坑基坑的外坑被动土压力，工程中应注意内坑的存在。

关键词(KeyWords)： 基坑宽度;坑中坑;有限土体;被动土压力;滑裂面

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(52078466)

作者(Author): 潘静杰,朱春柏,刘伟,房凯,刘念武

DOI: 10.19509/j.cnki.dzkq.2022.0167

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