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Dimensional fractured rock bolt reinforcement for testing the effect of crack arrest

Author: ZhangNing
Tutor: LiShuCai
School: Shandong University
Course: Geotechnical Engineering
Keywords: Three-dimensional fracture Uniaxial tensile Crack propagation Acoustic emission Anchoring Effect Fracture mechanism
CLC: TU458
Type: Master's thesis
Year: 2009
Downloads: 190
Quote: 2
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Abstract


Dielectric constant due to crustal rock movement, development, showing a significant discontinuity, there are a lot of joints, cracks and other discontinuities. Presence of altered rock fracture mechanical properties, reducing the strength of rock and make rock showed significant anisotropy. Engineering practice, people tend to be taken to reinforce measures to ensure reliable and safe operation of the project. Bolt underground engineering and rock slope reinforcement supporting member main one, it is jointed rock cut significantly strengthening the role of a small perturbation of the original rock, safe, reliable, and cost-effective reinforcement technology, not only can improve the integrity of the rock mass, as well as conducive to play rock medium itself self-supporting capability. Although the technology has been successfully applied to the anchoring engineering practice for nearly a century, but the anchor bolt mechanism not yet fully clear. Anchoring theory research has lagged far behind engineering practice. Therefore, to study the mechanism of bolt reinforcement project has certain guiding significance. In this paper, on the basis of previous studies, mainly in the following aspects: (1) as the base material with cement mortar, adding a certain amount of rubber powder, developed a new type of rock similar material. Through physical and mechanical parameters of the materials tested and found this modified cement mortar can well meet the requirements of similar material can be used as an ideal rock similar material; choose full thread of glass fiber reinforced plastics (GFRP) to simulate the anchor rod. (2) to design a precise positioning presets simultaneously cracks and anchor new mold; improved direct tensile test technology, largely avoided the specimen eccentric tension, improve test accuracy and efficiency. (3) produced with different forms (different from the penetration d / T, different fracture angle α) presets fissures, various anchoring methods (different angle and anchoring anchoring position) specimen, and its uniaxial stretching, compression test, through the analysis of different anchoring specimen stress - strain curve shape, strength properties, preset angle fracture initiation and expansion mode, to study the three-dimensional fracture anchor reinforcement for crack effect. (4) using three-dimensional localization of acoustic emission technique was studied under uniaxial tensile loading conditions throughout the whole single anchor acoustic emission characteristics of the specimen and the specimen failure mode. Through the above work, explores the fractured rock bolt reinforcement on the role, summed up the anchoring effect of three-dimensional fracture extended mode, the actual project has a certain significance.

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