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Study on Long Term Stability of Geotechnical Prestressed Anchor System

Author: LiYingYong
Tutor: WangMengShu
School: Beijing Jiaotong University
Course: Geotechnical Engineering
Keywords: Geotechnical prestressed anchoring system Long-term stability Reinforcement Mechanism Mechanical model Durability analysis Stress corrosion Dynamic Design Method Failure warning
CLC: U418.52
Type: PhD thesis
Year: 2008
Downloads: 353
Quote: 4
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Abstract


Based on an extensive literature study and practice, membership assistant Jinan Ring Expressway situ measured data, the use of theoretical analysis, field trials, laboratory experiments and numerical simulation studies means long-term stability of a comprehensive system of geotechnical prestressed anchor system in-depth research, and this research thinking combined with practical engineering application of research to determine the life of the the actual Engineering Division service beneficial to the theory and practice of research. (1) through a comprehensive study of the mechanism of geotechnical prestressed anchor system, type and mechanism of instability from a dynamic point of view, geotechnical prestressed anchorage system and its long-term stability of the new definitions and interpretations reveal rod material stress corrosion determine its long-term stability of the fundamental factors established geotechnical of prestressed anchoring system long-term stability of the overall research framework, the basic theory. (2) track and monitor the long-term field reveals the characteristics and laws of prestressed anchors in the change in the role of the different periods and different factors, rainfall, diurnal temperature changes caused by seasonal temperature prestressed approximate closed \variation of \Combination of research with actual monitoring data analysis through the use of rheological mechanics theory, to build a four-parameter reflects the rock and soil creep and prestressing rod material relaxation coupling constitutive model first proposed prestress \attenuation superimposed fluctuation \/ sub>) F Ce -ct sin (w 1 t φ 1 ). (3) through the analysis of the main factors that determine stress corrosion and orthogonal combination, developed indoor full scale of the analog geoenvironmental metal rod material stress corrosion test methods and devices. Based on the laboratory test to determine the law of the development of stress corrosion, for the first time establish a characterization of rod material features of stress corrosion the quantitative formula C l = · p 1 x 1 p 2 · e -p 3 x 2 · ( p 4 x 3 p 5 ), laid Geotechnical Prestressed Anchorage Systems Division serving a life study of the theory foundation. In situ Measurement reveals for the first time typical distribution and cross-sectional characteristics geotechnical prestressed anchor system stress corrosion in the actual engineering environment. Scene situ test data to amend the law on the indoor test can be used to predict the the judicial service life of the actual geotechnical prestressed anchorage system. (4) through the first scene in situ in the Battle Prestressed Anchor full scale uninstall comparative tests and numerical simulation studies reveal a single anchor failure effect and within the rock mass stress adjustment law, put forward a different position anchor cable affect The relationship between the factor and the pitch δ = f (L). Fast Lagrangian calculation procedure using a three-dimensional continuum numerical simulation study the anchor group failure effect and stability loss propagation law proposed partial prestressed anchor structural failure of the development of non-monotonous continuity. Failure anchor cable reaches a threshold, the rock and soil vertical plastic zone free face through rock and soil occurs first local instability. The local buckling where the relative position (distance) and the number of overall stability of the impact of having a significant difference. Obtained when the failure anchor rope more than eight or plastic surface area of ??the slope more than 200m 2 for the actual project, the occurrence of local instability; the main landslide adjacent level the same slope profile simultaneously local instability or local instability occurs each other through multiple (three or more) will lose the overall stability of important conclusions. (5) in the long-term stability of the system proposed geotechnical prestressed anchor system control principle and experts predict composite control method based on the first time given to consider the stress corrosion and the number of dynamic threshold optimization design method based on the anchor cable failure. A comprehensive analysis of the three geotechnical prestressed anchoring system stability criterion, creative determined based on the of prestressed variation and the stress corrosion regular Servo life, determine Secretary of actual engineering service life of 41 years Secretary of the different parts of the service life. Combined with different quantitative stress corrosion characteristics and on-site monitoring results for the first time, warning reinforcement of different failure cases deal with timing and reinforcement for different warning instability prestressed anchoring system approach.

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CLC: > Transportation > Road transport > Road works > Road maintenance and repairs > Conservation and maintenance of the roadbed > Slope reinforcement
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