2016年09月02日

Soil nail strengthening work


For all soil nail strengthening works, the primary objective is to improve the safety factor to the design requirement. Slope stability program by either limit equilibrium method or strength reduction method in finite element analysis will normally be used to assess the original safety factor and the improvement after strengthening. The extent of such stability assessment shall be carried out, at least, at areas where there is impact to human being if slope instability occurs. If there is any surcharge loading, it should be considered in the stability assessment. Both global stability and local stability shall be carried out for the concerned slope.
The use of soil nail anchors works best in soils that are sandy but with sufficient clay to allow unsupported cuts of up to 7 feet to stand temporarily. This system is not advisable to use next to buildings. Their strength is derived from the fact that the wall displaces slightly and the steel tendons stress and induce increased shear strength to the soil.

The soil nails are typically closely spaced and a 4″ thick shotcrete facing is applied to the earth face after the nails are drilled. One of the advantages of soil nails is that only a small percentage (5-10%) of the nails are tested which reduces the cycle time between rows.

This method can result in cost-effective top-down construction.
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