|
|
|
| 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.
|
|
Received: 26 September 2013
|
|
|
|
|
|
[1]王恭先.滑坡防治工程措施的国内外现状[J].中国地质灾害与防治学报，199s(1):1-9.
Wang Gongxian. Present Situation of Engineering Measures for Preventing and Controlling Landslide in China and Abroad[J].The Chinese Journal of Geological Hazard and Control，1998(1);1-9.
[2]陈德中.岩质高边坡综合治理施工技术[J].铁道工程学报，2004(9):85-88.
Chen Dezhong. Construction TechnIIIue for Treatment of High Rock Side-slope[J].Journal of Railway Engineering Society, 2004 ( 9 ) ; 85-88.
[3]马周全.钢管微型桩极限抗滑力的工程实例分析[J] 铁道工程学报，2012(9) ;45-48
Ma Zhouquan. Engineering Example Analysis of Limit Sliding Resistance of Steel Pipe Micropile[J].Journal of Railway Engineering Society, 2012(9) ;45-48.
[4]KAZUO KONAGAIA, YUANBIAO YINA, YOSHITAKA MURONOB. Single Beam Analogy for Describing Soil- pile Group Interaction}J}.Soil Dynamics and Earthquake Engineering, 2003(3) ;213-22l.
[5]BROWNDAN A, SHIE CHINE-FENG. Numerical Experiments into Group Effects on the Response of Piles Tolateral Loading[J].Computers and Geotechnics, 1990(3);211-230.
[6]Shu-Wei Sun, Ben-Zhen Zhu, Jia-Chen Wang. Design Method for Stabilization of Earth Slopes with Micropiles[ J].Soils and Foundations , 2013 ( 4 ) ; 487- 497.
[7]孙书伟，朱本珍，郑静，等.基于极限抗力分析的微型桩群加固土质边坡设计方法[J].岩土工程学报，2010 (11):1664-1669.
Sun Shuwei, Zhu Benzhen, Zheng Jing, etc. Design Method of Micropile Group for Soil Slope Stabilization Based on Ultimate Resistance of Analysis[J].Chinese Journal of Geotechnical Engineering, 2010 (11);1664- 1669.
[8]孙书伟，朱本珍，杨让宏.微型桩群与普通抗滑桩受力特性的室内对比试验研究[J].岩土工程学报，2009 (10):1564-1570.
Sun Shuwei, Zhu Benzhen, Yang Ranghong. Model Tests on Anti-sliding Mechanism of Micropile Groups and Anti-sliding Piles[J].Chinese Journal of Geotechnical Engineering, 2009(10) ;1564-1570.
[9]ITASCA. Fast Lagrangian Analysis of Continua in 3 Dimension; User’s Guide[M].Minneapolis:Itasca Consulting Group, Inc.，2005.
|
|
|
|
2014, Vol. 31 
