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The Study of Some Problems in the Anchorage Engineering for Soil and Rock

Author: ChenGuoZhou
Tutor: JiaJinQing;XuShi
School: Dalian University of Technology
Course: Structural Engineering
Keywords: Anchored Soil Anchor stress Beam-spring FEM 3D Stability analysis Slope Retaining
CLC: U417.1
Type: PhD thesis
Year: 2008
Downloads: 688
Quote: 6
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Abstract


Anchors have been used widely in slope, excavation and tunnel. However, the mechanism of anchor-soil interaction is not clear. This paper includes:(1)An analytical solution for shear distribution of anchor under pull load is presented by considering the progressive failure of anchor-soil interface, based on Mindlin solution of force at a point in the interior of a semi-infinite solid. Then a program is developed accordingly, and the flow chart of program is also presented. The results of analytical solution and the field measurements all show that peak value of resistance at the-anGhor-soil interface transfers to the distal end of the bonded length as the applied load increases. Further, the effect of soil elastic modulus and anchor diameter on shear distribution between anchor and soil is studied by using this analytical model. The result shows that greater soil elastic modulus leads to greater peak shear magnitude under the same load while greater anchor diameter leads to smaller peak shear magnitude.(2)The conventional beam-spring FEM used in deep excavation retaining design is based on anchored pile or anchored diaphragm retaining, and is not fit for prestressed anchor flexible retaining wall. Based on the construction characteristic of prestressed anchor flexible retaining wall, this paper modifies beam-spring FEM, gives a new technique to evaluate the excavating load for flexible retaining, and develops a new beam-spring FEM program accordingly. Lastly a practical engineering project is analyzed using the new beam-spring FEM code. The horizontal displacement of retaining wall and the axial force of each anchor are yielded and compared with the field data, which shows the new beam-spring FEM suits prestressed anchor flexible retaining wall.(3)Three dimensional equilibrium analysis methods could get a calculated result which is more suited for actual behavior of rock comparing with 2D analysis methods. This paper presents a 3D equilibrium analysis method to evaluate the stability factor of reinforced slope considering slip-shear failure model. The assumed failure model always occurs in practical rock slope. In this failure model, slide slip along a weak rock direct. Shear occurs on the other planes of the slide. The slip and shear interfaces are satisfied with the Moore-Coulomb Law. The normal force on the slip interface could be calculated through the force equilibrium analysis. The stability factor of rock slope could be obtained by iterative method. The calculated expression and program flow are presented in this paper. Then the comparison between 3D analysis method and 2D analysis method is performed. The effect of anchor angle and anchor direct on the stability of slope is also studied using this 3D equilibrium analysis method.(4)This paper also presents a case study of rock slope reinforcement in a constructing highway through Henan Province in China. A reinforcement system combining compression anchor and concrete beam is used to stabilize the slope with 45 m in height. 12 monitors are installed in order to record the change of axial force of the selected anchors. The monitoring data shows that the axial forces of the selected anchors are all under design load. It is concluded that the reinforcement system is effective for stabilizing the slope in the landslide area. Based the monitoring data, anchor forces chance along height and safety factor of anchors are discussed.

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CLC: > Transportation > Road transport > Road works > Roads ancillary structures and along the facilities > Protection works
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