摘要
为了分析高填土基坑降水开挖对周围环境的影响及基坑稳定性,笔者以实际工程为例,对该基坑的地下水位、深层水平位移、地表沉降值、锚索轴力和桩顶水平位移进行了监测.监测分析表明,在施工过程中,基坑周边地下水位的变化大且变化不均匀,部分已超过了预警值;随着开挖深度的增加,深层水平位移随深度的变化曲线由线性逐渐向"弓"形分布转变,最后深层水平位移最大值位于地表以下一定深度;在施工过程中地表沉降可分为急剧增长和平稳增长两个阶段,地表沉降主要发生在基坑开挖期;桩顶水平位移和锚索拉力均随开挖深度的增加而增大,当基坑开挖至设计标高时达到最大并趋于稳定,测试值均小于预警值,满足要求.
In order to analyze the influence of the environment and the stability of high fill foundation pits precipitation and excavation. In practical engineering as an example, groundwater levels, deep horizontal displacements, cable tensions, surrounding ground settlements and horizontal displacements of pile top were monitored. The analyses indicated that the groundwater levels changed greatly and were uneven during the constructing process, and the change of groundwater level at part hole had exceeded the warning value. With the increase of excavating depth, the changing curves of horizontal displacements along with depth altered from linear distribution to ＇bow＇ distribution. Finally, the maximum deep horizontal displacement located at a certain depth below the ground. The development of ground settlements fell into two stages： sharply increasing stage, and stationary increasing stage during foundation pit construction. The horizontal displacements of pile top and the cable tensions increased with the growth of excavating depth, reached their maximum and trended to be stable when the pit excavated to the design elevation, and the test values were less than the warning values, it suggested that the displacements of pile top and the cable tensions can meet the requirements.
作者
丁简
邓宗伟
DING Jian DENG Zong-wei(School of Civil Engineering, Hunan City University, Yiyang, Hunan 413000, China)
出处
《湖南城市学院学报（自然科学版）》
CAS
2017年第3期6-11,共6页
Journal of Hunan City University:Natural Science
基金
湖南省自然科学基金项目(2016JJ4013)
湖南省教育厅科研项目(14A024
16A038)
关键词
高填土
基坑
环境影响
稳定性
监测
high fill soils
foundation fit
environmental influence
stability
monitored
