flac3d數(shù)值模擬在潮濕地區(qū)土遺址探方穩(wěn)定性預(yù)判中的應(yīng)用

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4、ication of FLAC3D in Stability Pre-judgement of Excavation Unit of Archaeology Sites in Moist Environment Abstract Ground and underground water and rainfall are abundant in wet areas. The open test pits of archaeologica

5、l excavation in such environment are prone to lose stability and even to be destroyed, which pose a serious threat to the safety of the site and the safety of personnel. Based on the study of the application of FLAC3D in

6、 foundation pit, a method of applying this numerical analysis method in archaeology excavations is put forward in this article, which can make a reasonable prediction and analysis of the deformation and stability of the

7、test pits, verify the result of numerical analysis by a real engineering, discusses the feasibility of the FLAC3D in stability pre-judgement of archaeology excavation unit. The research results show that: (1) According t

8、o engineering experience, both straight wall and terraced excavation methods are chose. At the beginning of excavation, the deformation of pit wall is rotation-sliding along the potential slip surfaces, The rotation-slid

9、ing angle of pit wall in setback type is larger than the vertical pit wall. Along with the excavation, the deformation of the pit wall gradually convert into “kick foot”. (2) In the conditions of the simulation excavatio

10、n, the terraced excavation can obviously reduce the horizontal displacement of the pit wall in the most area, But it will not significantly reduce the displacement extremum of the pit wall, and transfer the area of displ

11、acement extremum into the deeper place in the pit wall where is closer to the bottom of the pit. Terraced excavation can transferred the danger zone to the bottom of the pit, the bottom of the pit can restrain the horizo

12、ntal displacement of the pit wall, so terraced excavation can improve the stability. (3) In the conditions of the simulation excavation, the horizontal displacement extermum of pit wall is from 4.2mm to 4.4mm, on the bas

13、is of the external conditions, the simulation excavation unit can achieve a stable state. (4) According to the comparative analysis of field monitoring and numerical simulation results, the conclusons can be drawn: ① Th

14、e results of numerical simulation are consistent with the field monitoring data, the displacement and deformation are consistent with the monitoring results, the method of numerical calculation is correct. ② By adopting