摘要
基于深基坑微型桩支护模型试验,研究深基坑开挖过程与基坑周边堆载时支挡体系和基坑边坡的力学响应特征及破坏规律。研究分析表明：开挖过程中,每级开挖面处桩体受力较大,开挖面以上土压力随着开挖深度的增加而逐渐减小,桩体弯曲变形显著,类似于悬臂梁受力弯曲,且随着开挖深度的增大,变形逐渐增大,开挖面以下桩体受力、变形变化较小;基坑周边堆载时,桩-土体系的破坏进一步加剧,基坑底面附近局部范围桩身弯矩变化较大,桩体剪切作用显著;整个过程中,基坑顶面首先发生破坏,地表产生裂缝且伴有土块脱落,随着开挖加载的进行,基坑边坡将产生多个滑裂面,呈叠瓦式排列。
Based on the model test of deep excavation supported by micropiles, the mechanical response characteristics and destruction rules of retaining system and slope during excavation process and loading on the top of the excavation slope were studied. The results showed that the stress of the pile at each excavated surface was larger during excavation,and the earth pressure above the excavated surface gradually decreased with the increase of the excavated depth,and the bending deformation of the pile was significant,similar to that of the cantilever beam,and the deformation increased with the excavated depth,and the deformation of the pile below the excavated surface was small. When loads were loaded on the top of the excavation slope,the breaking intensity of potential failure modes of the pile-soil system was more obvious,the bending moment of the pile shaft adjacent to the bottom of the excavation changed greatly,the shear effect of the pile was significant. In the whole process,the first damage occurred on the top of the foundation excavation,and there were cracks on the earth surface accompanied by the shedding of the soil. With the excavating and the loading,the multiple sliding surfaces ocurred in the excavated slope,which were arranged in a imbricate pattern.
作者
王鹏
高洁
段旭
门玉明
韩冬冬
WANG Peng;GAO Jie;DUAN Xu;MEN Yuming;HAN Dongdong(Xi＇an China Highway Geotechnical Engineering Co.,Ltd.,Xi＇an 710065,China;China Electronic Research Institute of Engineering Investigations and Design,Xi＇ an 710054,China;College of Geology Engineering and Geomatics,Chang＇ an University,Xi＇ an 710054,China)
出处
《工业建筑》
CSCD
北大核心
2018年第7期101-105,210,共6页
Industrial Construction
基金
陕西省重点科技创新团队计划项目(2015KTZDSF03-03-01)
中央高校基本科研业务费专项资金(31082617016)
关键词
深基坑
微型桩
力学响应
破坏规律
deep foundation excavation
micropiles
mechanical response
the rules of destruction
