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| Engineering Example Analysis of Limit Sliding Resistance of Steel Pipe Micro － pile |
| MA Zhou － quan |
| Northwest Research Institute Co．Ltd of CREC，Lanzhou，Gansu 730000，China |
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Abstract Research purposes:Micro － pile construction has been widely used in the reinforcement in the mountains slope ( landslide) with the feature of simple，rapid construction，layout flexibility and strong skid resistance． Based on the failure examples of steel pipe micro － pile reinforcement slope，using finite element method to research the limit sliding resistance of steel pipe micro － pile through back analysis．
Research conclusions:This study showed that，for the steel pipe micro － pile that using pile － cap － beam combined structure，the landslide － thrust distribution back of the pile is big in the end and small in the middle performance " U" type distribution form; Soil resistance before the pile is big top and small bottom performance inverted triangular distribution． Limit sliding resistance of steel pipe micro － pile composite structures ( four row of steel pipe pile + contact beam) is 596 kN，single steel pipe micro － pile average limit sliding resistance for 149 kN． In practical projects，these engineering measures can be used to improve the anti － sliding ability of steel pipe micro － pile such as modify between pile soil，setting support structure before pile，optimize structure distribution form，and so on．
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Received: 10 February 2012
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2012, Vol. 29 
