摘要
润扬长江大桥北锚特深基坑设计尺寸达69 m×50 m×50 m,支护方案为嵌岩地连墙加内支撑结构形式。为深入了解该基坑支护方案的安全情况,并预测其可能的破坏形式,在模拟施工过程的三维非线性有限元分析的基础上,通过人为加大土体自重直至支护结构破坏的方法,对该基坑进行了破坏模拟分析。分析结果表明,该基坑的破坏将始于支撑的压坏,进而使地连墙屈服或折断。而在不同开挖深度下,基坑的破坏形式有所不同,开挖深度越大,破坏造成的危害也越大。
The size of the north anchor pit of Runyang Bridge is about 69 m × 50 m ×50 m. The support forte pit is concrete diaphragm wall with internal support structure, and the diaphragm wall is embedded into rocks. In order to obtain the safety coefficient and the failure process of this pit, 3D nonlinear finite element analysis is carried out with ANSYS. The excavation process is simulated with the element dead/active function of ANSYS, The self-weight of soil in finite element model is increased hypothetically until support structure fails, so that the failure process of support structure can be simulated. Comparing the assumed self-weight of soil with the true value, the safety coefficient of the pit can be obtained. The numerical results show that all the failures of the pit begin with the collapse of the internal support and the failure models are different in various excavation depths. This method can also be applied to the other pits if their support structure is relatively stiff.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第11期1906-1911,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
深基坑
三维有限元分析
破坏模式
Bridges
Diaphragms
Failure (mechanical)
Finite element method
Safety factor
Soil mechanics
Three dimensional
