不同坑底加固方式对深基坑变形影响的研究  

STUDY ON INFLUENCE OF DIFFERENT WAYS OF PIT BOTTOM REINFORCEMENT ON DEFORMATION OF DEEP FOUNDATION PIT

作　　者：熊春宝[1] 高鹏[1] 田力耘 熊爱成 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津市陆海测绘有限公司,天津300191

出　　处：《建筑技术》2015年第6期486-490,共5页Architecture Technology

基　　金：国家重点基础研究发展计划(973计划)课题(2010CB732106)

摘　　要：通过使用ABAQUS有限元软件建立三维模型,研究内撑式深基坑内被动区坑底加固对基坑变形的影响,讨论基坑坑底满堂、裙边、抽条、格栅等四种不同加固方式对坑底隆起和围护结构侧向位移的影响,并结合工程实例的实测值与模拟值对比,验证模型的合理性。结果表明:坑底加固能有效抑制土体的隆起,其抑制作用从大到小依次是满堂、格栅、抽条、裙边加固,裙边加固能有效减小加固范围内土体的隆起;这四种加固方式对抑制围护结构侧向位移的效果差距不大,主要影响最后一道支撑以下围护结构的侧向位移。Based on the three-dimensional model established by using the ABAQUS finite element software, the influence of pit bottom reinforcement in passive zone and internal braced deep foundation pits on deformation of foundation pit was studied. The influence of different reinforcement ways （the full bottom pit, skirt edge, ribbon and grille） on the pit bottom upheaval and lateral displacement of the retaining structure were discussed. And combined with engineering examples, the model is verified. The results showed that the soil reinforcement can effectively inhibit the action of the foundation-pit, and the inhibitory effect from large to small is full pit bottom, grille, ribbon, skirt edge reinforcement. At the same time, skirt can effectively reduce the pit bottom upheaval within the scope of soil reinforcement. But for the lateral displacement of the retaining structure, the four reinforcement ways have little difference, mainly affecting the last lateral displacement of retaining structure.

关 键 词：坑底加固 内撑式深基坑 基坑变形 修正剑桥模型 

分 类 号：TU753[建筑科学—建筑技术科学]