某基坑位移、沉降和内力实测结果及预警值讨论

›› 2008, Vol. 29 ›› Issue (4): 1045-1052.

某基坑位移、沉降和内力实测结果及预警值讨论

李俊，张小平

南京航空航天大学土木工程系，南京210016

收稿日期:2006-04-05 出版日期:2008-04-10 发布日期:2013-07-10
作者简介:李俊，女，1970年生，讲师，博士，主要从事基坑工程方面的研究。
基金资助:
江苏省自然科学基金（青年科技创新人才技术带头人）（No. BK2004427）。

Discussion on monitoring results of displacements, settlements and inner forces of a foundation pit and early-warning value

LI Jun, ZHANG Xiao-ping

Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2006-04-05 Online:2008-04-10 Published:2013-07-10

摘要/Abstract

摘要： 以某深基坑支护结构位移、沉降、内力及水位的施工监测数据为依据，探讨了位移、沉降与内力大小及变化规律。实测表明：支护桩及外侧土体各点随着基坑开挖深度和时间的递增，水平位移逐步增大，增大速度由快逐步趋于平稳。另外，位移大小还与周围建筑物位置和支撑条件有关。周围建筑物的沉降随时间增大，且离基坑越近则越大；立柱沉降及土的隆起量与承受的支撑重量及基坑形状有关；支撑轴力的大小及变化与地质条件、支撑刚度和施工开挖顺序及速度等因素有很大关系；桩身偏心较小，底部可按轴心受力计算。最后，对预警值进行了讨论。

关键词: 深基坑支护, 位移, 沉降, 监测, 预警值

Abstract: Basing on construction monitoring of the supporting system for a deep foundation pit, a study on the displacement, settlement, inner force and water level are carried out. It is indicated that the horizontal displacements of timbering stakes as well as observation spots outside increase step by step along with the increase of the excavation depth and construction time. Meanwhile its increasing velocity tends to steady gradually. In addition, the displacements are also related to the location of building nearby and the supporting condition. The settlement of building nearby increases with time, and is greater near to the pit. The settlement of standing column and the apophysis of earth are related to the bearing weight and the form of pits. The axial force of support is related to earth condition, support rigidity as well as order and velocity of construction, etc.The partiality value of stake body is small; the bottom can be calculated according to axial forces. The early-warning value is taken into account in this paper.

Key words: supporting system for foundation pit, displacement, settlement, construction monitoring, early-warning value

中图分类号:

T 413.6+2

李俊，张小平. 某基坑位移、沉降和内力实测结果及预警值讨论[J]. , 2008, 29(4): 1045-1052.

LI Jun, ZHANG Xiao-ping. Discussion on monitoring results of displacements, settlements and inner forces of a foundation pit and early-warning value[J]. , 2008, 29(4): 1045-1052.

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