Soil nail application in different construction purposes

Soil nail application in different construction purposes
In global construction, soil nails are widely used in construction sites as an anchor system. Not only are soil anchors used as a slope stability retaining structure, but alsofor other purposes as follows
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Tie- back wall –
In this case, the soil nails are used to provide a tension force tothe back of the wall to increase the passive pressure of retaining wall system. It’sconceptually very similar to geo-synthetic soil nail (Ortigao, 2004). In order tominimize wall movement and ground settlement, tieback walls are designed toachieve an efficient earth retaining structure within economical considerations.

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Ground Anchor
– Using soil nails to provide the tensile force in the ground.Typically, they are used to prevent the overturning or floatation of structures suchas footing or structures in water.
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Deep excavation support -
Usually this involves using soil nails as a temporarymeasure for deep excavation stabilisation. Similar, to the tie-back wall method, indeep excavation, vibration sheet pile will be installed for supporting the verticalcut slope. The deeper the excavation , the higher the active pressure that will begenerated and act on the pile wall. Therefore, structural supporting on upper portions of the pile are necessary. Soil nails can provide these external tensileforces to help resist the deformation of pile wall.
Advantages of Soil nailing for Slope Stability
Soil nailing presents the following advantages that have be contributed to thewidespread use of this technique in many countries in more recent times.
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Economy :
Steel bar reinforcement is inexpensive. The concrete or shotcrete for the soil nail head is relatively small and inexpensive. Construction techniques aresimple and quick. Skilled labor can be minimized. According to Cornforth (2005)mentioned that, soil nailing can result in a
cost saving of 10 to 30 percent whencompared to tieback walls.
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Rate of construction:
Fast rates of construction can be achieved if adequateequipment is employed.
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Light construction equipment:
Soil nailing can be done using a conventionaldrilling rig and grouting equipment. Thus, equipment can be delivered to siteeasily even in areas with difficult access or limited working space constraints.

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