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Abstract In order to study the micropiles anti-slide mechanism by the step loading method on rectangular arranged intensive micropiles retaining system，a full scale lateral loading test and a numerical calculation on it were performed. On the basis of prototype test，a finite element model is established to analyze the lateral bearing capacity of the pile group by changing the design parameters like soil parameters，micropile elastic modulus，pile spacing and row spacing. According to the results，the front-row piles will not play the role in retaining until the landslide thrust force exceeds a certain value for a stratum of silty clay；the position of the earth pressure peaks in front of piles is deeper than the earth pressure peaks inside of piles；the lateral load bearing rate of the soil and the pile is 7∶3. Controlling the piles in optimal row spacing was more effective than optimizing other parameters in enhancing the lateral bearing capacity and reducing displacement of pile tip. The test result provides reference for further analysis on anti-slip system of intensive micropiles and optimization of engineering design.
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2015, Vol. 34 
