|
|
|
| Research on the Corrosion Test of Micro-pile Anti-slide Structure |
| JIANG Chu-she1, LI Qing-hai 1，HE Gang1 ,ZHOU De-pei 2 |
| 1 .China Railway Eryuan Engineering group Co. Ltd, Sichuan 610031，China; 2. Southwest Jiaotong University，Chengdu，Sichuan 610031，China |
|
|
|
|
Abstract Research purposes:The application time of micro-pile is not long enough to discover the problem of anti- corrosive durability. There is also no relevant terms yet about the anti-corrosive durability of micro-pile in the current codes. There are two ways of micro-pile corrosion: the reinforcement corrosion and the cement mortar corrosion of piles. For the engineering application, the laboratory corrosion test of dry and wet cycle and the general loading test were conducted. The bond behavior with rocks and the bending fracture failure of micro-pile under different corrosion degree were studied.
Research conclusions : The test results show:(1)The micro-pile with smaller water cement ratio and larger cement sand ratio，was performed better bond behavior and corrosion durability.(2)The stress distribution was optimized in order to reduce the large cracks by separated reinforcement by physical isolated method. This also improved the bearing capacity of micro-pile structure. (3)Based on the research，several suggestions of micro-pile corrosion durability were proposed，such as design working life, pile diameter and protective layer, and were recommended for design reference.
|
|
Received: 16 December 2013
|
|
|
|
|
|
| [1] |
Tom Armour, Paul Groneck，James Keelev，etc. Micropile Design and Construction Guidelines Implementation Manual [ R ]. FHWA Office of Technology Applications，FHWA Federal Lands Highway Division Offices, FHWA Region 10，2000.
|
| [2] |
Paul J. Sabatini，Burak Yanyu, Tom Armour, etc. Micropile Design and Construction Reference Manual [R ]. National High Institute，Federal Highway Administration，IL S. Department of Transportation Washington, D. C.，2005.
|
| [4] |
GB 50086-2001, 锚杆喷射混凝土支护技术规范[S].
|
| [5] |
GECS 22,岩土锚杆（索）技术规程[S ].
|
|
CECS 22，Technical Specification for Ground Anchors [S].
|
| [6] |
SL212—98，水工预应力锚固规范[S].
|
|
SL 212—98， Design Specification for Hydraulic Prestressed Anchorage [ S].
|
|
TB 10005-2010，Code for Durability Design on Concrete Structure of Railway[ S].
|
| [8] |
李鲲.框架型深路堑支挡结构计算及支护效果对比分析 [J],铁道工程学报,2013(6):34 -38.
|
| [7] |
TB 10005-2010,铁路混凝土结构耐久性设计规范[S].
|
|
GB 50086—2001，Specifications for Bolt - shotcrete Support[ S].
|
| [3] |
D.A. Brucel，A. W. Cadden，P. J. Sabatini. Practical Advice for Foundation Design - Micropiles for Structural Support [ C ] //Contemporary Issues in Foundation Engineering, Proceedings of the Sessions of the Geo - Frontiers 2005 Congress, Geo - Frontiers 2005. Austin Texas： ASCE, 2005:1 -25.
|
|
Li Kun. Calculation of Retaining Structure for Frame - type Deep Cutting and Comparative Analysis of Support Effect [ J ]. Journal of Railway Engineering Society， 2013(6) :34 -38.
|
|
|
|
2014, Vol. 31 
