Ultimate Load Analysis of Soft Interlayer Considering Slip Plane Conditions(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2016年04期
- Page:
- 36-43
- Research Field:
- Publishing date:
Info
- Title:
- Ultimate Load Analysis of Soft Interlayer Considering Slip Plane Conditions
- Author(s):
- YIN Yong; QIAO Lai-jun; ZHOU Guo-qing
- State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology
- Keywords:
- soft interlayer; plastic extrusion failure; main stress method; yielding criteria; slip condition; ultimate load
- PACS:
- -
- DOI:
- -
- Abstract:
- Aimed at the problems that some available calculation theories of ultimate load to soft interlayer could not fully take into account of the slip plane conditions and most of these theories adopted metal yielding criteria, not suit for geomaterials with internal friction characteristics, based on Prandtls plastic extrusion failure mode, the variation law of ultimate load of soft interlayer under three slip conditions and the applicable scopes of these slip conditions were analyzed with the main stress method and the MohrCoulomb yielding criteria. Meanwhile, the relevant formulas for ultimate load were also deduced. The solutions were contrasted with those of thinlayer extrusion theory and Prandtls squeezing theory, and the appropriate scope of flakiness ratios of the proposed method was also suggested. The results show that the ultimate load of soft interlayer is enhanced with the increment of flakiness ratio, strength parameter and friction coefficient.However, as the friction coefficient increases to a certain value, the ultimate load will not be varied anymore. The effect of slip conditions on ultimate load is not obvious when the strength parameter is low, and the ultimate load is controlled mainly by strength parameters. While the strength of soft interlayer increasing gradually, the influence of slip conditions on ultimate load is enhanced steadily, it is even more significant especially with a higher value of flakiness ratio. The proposed formula can reflect the effect of surface slip conditions to the ultimate load of soft interlayer more definitely, and can contribute references to the stabilization analysis of soft interlayer in rocksoil mass.
Last Update: 2016-07-22