Analysis of Influencing Factors on Stability of Micropile-cable System Reinforced Slope
WU Li-jianl，TAN Dong-sheng2，HONG Zheng3
1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji University，Shanghai 201804， China; 2. Northwest Research Institute Co. Ltd of C. R. E. C，Lanzhou，Gansu 730000，China; 3.Key Laboratory of Mechanics on Disaster and Environment in Western China，Lanzhou University，Lanzhou，Gansu 730000，China
Abstract：Research purposes: With smaller flexural rigidity, the lateral resistance of individual micropile is generally small. So it is impossible for micropiles to reinforcing the large scale slope failure. In order to improve the bearing capacity of micropiles，a new type of micropile-cable system was developed in this paper. The components and features of the system were introduced briefly. As such，a series of numerical slope stability analysis for a reinforced slope were performed using FLAC3 D to investigate the behavior of the sy stem and its influencing factors.
Research conclusions:(1)It is found that the micro pile-cable system can largely improve the safety factor of the slope and the optimum prestressed force is almost 400 kN. (2)There is a big difference in the thrust among different rows of micro pile of the system. During the failure of the reinforced slope，the rear row of micropile resist the maximum value of load , followed by the middle row of micropile，while the head row of micropile resist the smallest value of load.(3)It is concluded from the limited parametric study that the reinforced slope is more stable when the head of pile is fixed and the inclined angle for micro pile and cable in the system are spectively installed with 250 and 140. (4)The link between the head of micro pile and cable should be welded each other and merged by fine concrete to make the system behave much compatibly.(5)The results provide a useful basis for applications of micropile-cable system in slope and landslide reinforcing in mountainous area.
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2014, Vol. 31 
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