2017年08月14日

Self drilling soil nail system

Large quantity of engineering construction shows that broken rock mainly takes place in surrounding rock of tunnels, with the characters of deformation and abruptness, it’s hard to deal with the problems exist in tunnel support of hard tunnel only by self drilling soil nail, especially in the hard tunnel at jointed fractured zone.
Information on soil and bedrock hydraulic head (i.e., porewater pressures) is required for slope stability analyses of self-drilling anchored systems. The available piezometer and hydraulic head data for each water-bearing zone should be evaluated, but note that these hydraulic heads are likely to change as a result of seasonal changes in precipitation and construction activities that change or interrupt water flow paths.
For stability analyses, an envelope of maximum heads measured at different times of the year should be conservatively assumed. The required restraint force that must be developed by the self drilling soil nails and the wall will depend on the location of the wall relative to the sliding surface and the amount of material to be stabilized.
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Posted by soilnailsystems at 18:49│Comments(0)TrackBack(0)

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