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Vincent Chu answers......
Soil nails are mainly designed for stabilization of major slips. How should designer cater for the stability of minor slips?
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Vincent T. H. Chu is renowned internationally Photograph of vincent chuas walking encyclopedia of civil engineering. Author of a number of widely acclaimed civil engineering books, Mr Chu is recipient of various reputed awards including Young Engineer of the Year Award 2008 (Merit) by the Hong Kong Institution of Engineers &  Ombudsman’s Award 2007 (under complaint-related category). He is also listed in 11th Edition of Marquis Who's Who in Science and Engineering. ConcreteBasics.org thanks him for his exemplary contribution to the cause of civil engineers around the world.
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Few measures to cater for stability of minor slips are:

(i) Adoption of smaller diameter size bars at closer spacing;

(ii)  Installation of tie beams at the same horizontal levels;

(iii)  Provision of steel wire meshes in-between soil nails; and

(iv)  Provision of short soil nails in combination of long soil nails.


Reference: 200 Questions and Answers on Practical Civil Engineering Works by Vincent Chu
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