摘要
以某深大基坑为研究对象,以有限元FLAC 3D进行仿真分析及现场监测为研究手段,对该基坑施工过程中的应力应变变化规律进行研究。通过对比有限元仿真计算理论值和现场实测数据可知,有限元仿真计算结果与现场实测数据变化规律相似,两者误差较小,吻合度高,验证了有限元计算的有效性,在不适合布设传感器的区域可使用有限元进行仿真计算;环形支撑梁承受一定的剪力和弯矩,较大值主要集中在支撑梁、支撑环梁和冠梁的相交节点处;基坑支护桩和地表沉降曲线均为两头小,中间大,支护桩位移最大值出现的位置略高于基坑开挖面,地表沉降最大值出现位置与支护桩间存在一定距离,约为开挖深度的30%~60%。
This paper takes the deformation of a deep and large foundation pit as the research object, and uses FLAC 3 D simulation analysis and on-site monitoring as the research method to study the stress and strain changes of supporting structure during the construction of the foundation pit. By comparing the theoretical value of the finite element simulation calculation with that of the field measured data, both of them are similar. The error between the two is small and the agreement is high, which verifies the validity of the finite element simulation. The area that is not suitable for sensor placement can be simulated by finite element. The ring support beam bears a certain shear and bending moment, and the larger value is mainly concentrated at the intersection of the support beam, the support ring beam and the crown beam. The foundation pit supporting piles and the surface settlement curve are both small at both ends and large in the middle. The maximum displacement of the supporting piles appears slightly higher than the excavation surface, and the maximum surface settlement appears at a certain distance from the supporting piles, about 30% to 60% of the excavation depth.
作者
陈再兴
Chen Zaixing(Qinghai College of Architectural Technology,Xining 810012,China)
出处
《工程勘察》
2022年第1期65-69,共5页
Geotechnical Investigation & Surveying
关键词
深大基坑
支护结构
仿真计算
环形支撑梁
deep and large foundation pit
supporting structure
simulation calculation
annular supporting beam
