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Finite Element Analysis of Reinforcement by Shotcrete for Rock Slope and Its Engineering Application

Author: LiTieRong
Tutor: LeiGuangYu
School: Changsha University of Science and Technology
Course: Structural Engineering
Keywords: Reinforcement by Shotcrete Ansys Shotcrete surface force Outside the length of anchor head Pull-out test
CLC: TU457
Type: Master's thesis
Year: 2009
Downloads: 163
Quote: 2
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Abstract


Shotcrete reinforcement law in recent years because of good training results, the implementation of strong, simple in construction, compared with other economic rationality and reinforcement measures are widely used,However, due to the current anchor bolting in the high slope in the mechanism of reinforcement has not fully get,And research focus on the work of a single mechanism of the bolt,On the bolt、spray layer、not enough rock interaction study,Such as the length of bond-type anchor in the stage of the work force, and the first outside of a reasonable length of anchor values, sprayed layer of stress analysis have not been given sufficient attention,At the same time, China Shotcrete Rock Slope Reinforcement Design and Construction has not yet been established norms,And "bolt shotcrete support technical specifications" (GB50086-2001) for the implementation of the chamber, with large differences in slope,This Shotcrete reinforced slope design and construction of the standardization difficult。In this paper, the third installment of the Three Gorges reservoir area in Hubei Province County project against the backdrop of high slope,Application of ANSYS finite element analysis software for different types of rock the establishment of full-length bond-type anchor, sprayed layer of rock and free-type anchor unbonded paragraph, sprayed layer of rock mass interaction model,And comparative analysis;Bond-type anchor for the full-length pull-out test in practical engineering problems and unreasonable, and made some suggestions, received a number of theoretical and practical value of the results can be summarized in the following points:1. Free paragraph-type anchor unbonded work phases:rock and soil lateral pressure will be transmitted to the anchor surface and the outside spray anchor head;Bond-type anchor the work of full-length phases:lateral pressure from rock and soil surface spray and anchor bolt sharing free paragraph;2. Free paragraph bolt grouting can share a considerable portion of the lateral rock pressure, reduce the surface anchoring force jet,In the overall structure or block of rock, freedom to share grouting paragraph 0.25～0.41 times the lateral rock pressure;Layered structure of rock, freedom to share Grouting paragraph 0.14~ 0.39 times the lateral rock pressure;Cracked or loose rock structures, the freedom to share Grouting paragraph 0.01~0.1 times the lateral rock pressure;3. The introduction of reduced coefficient“k”;Specification of the current pressure on the rock side of calculation formula be amended, as a surface spray anchor design load;4. Given outside the full-length adhesive type anchor bolt head (hook) the length of the proposed formula for calculating;5. Green light of the Three Gorges reservoir region of high slope wadi Project,Adopted a revised formula for calculating the jet to anchor outside the anchor surface and the design of the first,The results show that the projects bolt anchorage supporting structure is a reasonable;6. Determine the anchor body and the formation characteristics of bond strength between the anchor value may not be too long paragraph,Otherwise, there is not only absurd in theory, but also caused by power off and pull anchor tendons intact paragraph;Acceptance Test bolt test method should pay attention to ensure the acceptance of scientific rationality。

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock stability analysis
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