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Abstract Four selected engineering accident examples of composite soil nailing walls are particularly analyzed and studied；and some conclusions are drawn as follows. (1) When the safety factor of global stability checking of composite soil nailing wall meets the requirements of specification，the local stability can not be checked. (2) The “design bearing capacity” of nailing is difficult to be checked；and the“pull-out resistance of acceptance” could be adopted as the quality test standard and the basis of rod body strength design. (3) 6 kinds of composite soil nailing wall failure modes of the 13 kinds should be mainly checked and the other kinds could adopt structural measures，and so on. In addition，the research results include that：application conditions of composite soil nailing wall，methods of basic test and acceptance test of soil nailing，treatment principles of excavation of pit inside pit and edge-corner effect，exploration and survey requirements for surrounding environment，solution to bad engineering plan and coordination and lack of geotechnical engineering professional experience，etc. These theories research results have been reflected in the new implemented national standard of Technical Code for Composite Soil Nailing Wall in Retaining and Protection of Excavation.
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Received: 04 August 2012
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2012, Vol. 31 
