Soil nails are known as ‘‘passive inclusions’’ because they rely on very small ground movements to mobilize their reinforcing stresses, which in turn influence the mechanics near potential failure surfaces in the soil mass. This is in contrast to ground anchorages ~such as tie-backs! that are often post-tensioned after installation and are designed to prevent ground movement by overstressing.
Because of these inherently different reinforcement mecha-
nisms, it became clear that new analysis methods were needed for
oil nailed cuts. This has led to debates about various aspects of
he analysis, including the importance of nail bending versus ten-
ion, the most realistic slip surface, etc. A number of software
packages have been developed to analyze soil nailed walls, with a
common characteristic among virtually all of the approaches
being that they are adaptations of slope stability analysis methods.
The use of modified slope stability programs has two problems:
First, it means that the geotechnical engineering practitioner must
usually purchase one of the software packages ~which can be
expensive! to do state-of-practice soil nailed wall analysis; and
econd, there are so few test walls that have been brought to
ailure that our knowledge of limit states in these walls is not well
known in different soil types. Regarding the latter point, there are
at least two full-scale soil nailed walls brought to failure in which
the failure surfaces were not typical slope stability slip surfaces,
but appeared to be approximately linear, wedge-type failures. A
method of wall analysis that stems from a trial wedge method
used for retaining walls would be more accessible for engineers to
implement, and provide a relatively simple and inexpensive
method for preliminary or supplemental design calculations for
soil nailed walls.
This paper presents a new approach that allows soil nailed
walls to be analyzed using a spreadsheet-based, trial wedge
method. This method stems from the existing U.S. Federal High-
way Administration ~FHWA! analysis method and considers only
tension in the nails as contributing to nail-soil mass stability. The
approach was used to evaluate two walls intentionally brought to
failure: the Amherst Test Wall, a soil nailed wall in clay that was
failed by overexcavation; and the Clouterre Test Wall No. 1, con-
structed in Fontainebleau sand and failed by backfill saturation.
请把语句改通顺点。。不要从在线直接弄过来啊····
参考资料:查的
参考资料:累死我了
谁来帮我翻译翻译啊··急用···头都大了··谢谢谢谢!!!
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