摘要
以绍兴地铁杭绍线某风井深基坑为背景,对开挖施工过程中的支护结构侧向位移、土体侧向位移、周边地表沉降、临近高速公路沉降和支撑轴力的监测数据进行分析。研究表明:围护结构的测斜分布曲线和临近土体的测斜曲线变化趋势一致,最大侧向变形值位于基坑底部;基坑开挖引起的周边沉降具有明显的时空效应,呈现凹槽型的变化趋势;沉降的大小不仅与支护结构的侧向位移有关,还受到场边堆载和基坑隆起的影响;高速公路临近基坑区域的沉降变形最大,需要加强监测并减少施工扰动;内支撑轴力在施工初期增长较快,随后逐渐趋于平缓。
This paper presents a case history of construction monitoring of the deep excavation for the ventilation shaft of Shaoxing Metro.The lateral deflections of the supporting structure as well as soil mass,settlement of adjacent soils as well as nearby highway and the axial force in the supporting structure were monitored.The results indicate that,the deflection curves measured in the supporting structures using slope inclinometer are similar to those observed in the adjacent soils and the maximum lateral deflections occurred at the bottom of the excavation.Spatial effect was observed in settlement in the adjacent soils and the bowl-shaped settlement pattern was measured at each side.The magnitude of the settlement was not only related to the lateral deflections of the supporting structures,but also was affected by the near be surcharge and the bottom heave of the excavated area.On the adjacent express highway,maximum settlement was measured at locations close to the excavated area,he frequency of the construction monitoring should be increased to ensure that the construction disturbance can be minimized.The axial force in the supporting structure increased rapidly during the initial excavation stage and became stable afterwards.
作者
任城
黄睿
REN Cheng;HUANG Rui(College of Civil Engineering,Shaoxing University,Shaoxing 312000;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing 312000)
出处
《土工基础》
2020年第3期361-365,共5页
Soil Engineering and Foundation
关键词
监测
地下连续墙
水平位移
沉降
Construction Monitoring
Diaphragm Wall
Horizontal Deflections
Settlement
