基于监测数据对基坑工程变形规律分析

发布时间：2018-01-04 03:45

本文关键词：基于监测数据对基坑工程变形规律分析　出处：《沈阳建筑大学学报(自然科学版)》2015年06期 　论文类型：期刊论文

【摘要】：目的为解决基坑开挖时结构的安全与稳定问题,对基坑工程的变形进行分析,找出影响规律.方法以营口某深基坑工程实例为研究背景,整理现场得到的桩顶位移、地表沉降及深层土体水平位移等监测数据,对基坑工程的支护结构和周围土体及墙后土体在施工过程中产生的位移变化进行分析.结果支护结构相同的挡墙坑角处变形最小,中间位置变形最大,并且基坑变形随着开挖深度的增加而变大.开挖深度较大的软土地区基坑周边深层土体水平位移曲线类型大致表现为抛物线形,其最大水平位移大致为(2.0~10.0)×10-4hd,通常发生在基坑工程底部附近.结论深基坑工程的支护结构顶部水平位移与竖向位移变化趋势一致,表明二者的产生条件和影响因素大致相同.坑底部下面土体的水平位移对于坑底隆起有着直接影响,支护结构的强度越低,坑底部隆起的增强区域的范围也越大.
[Abstract]:Objective in order to solve the problem of structure safety and stability during excavation, the deformation of foundation pit is analyzed and the influence law is found out. Methods A case of Yingkou deep foundation pit is used as the research background. The monitoring data such as pile top displacement, surface settlement and horizontal displacement of deep soil were collected. The displacement changes of the retaining structure and surrounding soil and the soil behind the wall in the construction process were analyzed. Results the deformation of the same retaining structure at the corner of the retaining wall was the smallest and the deformation in the middle position was the largest. And the deformation of foundation pit becomes larger with the increase of excavation depth. The horizontal displacement curve of deep soil around the foundation pit in soft soil area with higher excavation depth is parabola. The maximum horizontal displacement is about 2.0 脳 10 ~ (-4) 脳 10 ~ (-4) HD. It usually occurs near the bottom of foundation pit. Conclusion the horizontal displacement and vertical displacement of the support structure in deep foundation pit engineering are consistent with each other. The horizontal displacement of the soil under the bottom of the pit has a direct effect on the uplift of the pit bottom, and the strength of the supporting structure is lower. The larger the range of enhancement areas raised at the bottom of the pit.
【作者单位】：沈阳建筑大学土木工程学院;
【基金】：国家自然科学基金项目(10902073) 住房和城乡建设部研究开发项目(K32015001)
【分类号】：TU433
【正文快照】： 随着我国经济的迅猛发展,高层建筑大量涌现,如何合理开发利用地下空间成为城市可持续发展的另一要求[1].然而深基坑工程是组成地下空间施工的重要部分,它的安全与稳定性问题现已经成为了大家关注的焦点.随着市区内建筑及基础设施快速增加导致建筑用地大量缩水,越来越多的深基

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