疲勞荷載與腐蝕耦合作用下巖土預(yù)應(yīng)力錨固結(jié)構(gòu)長期耐久性研究
[Abstract]:Rock-soil Anchorage technology is a common and efficient method to reinforce and treat rock and soil. The prestressed Anchorage technique is used to reinforce the structures in geotechnical engineering, which can control the deformation and maintain the stability of the system. It has the following advantages: good effect, simple construction, safe and reliable, low cost, and has been widely used in slope, foundation pit, tunnel, underground cavern, mine and so on. However, the prestressed Anchorage structure has been subjected to tensile stress during the working period, and the surrounding environment of the structure is complex, there are a large number of erosive media and stray current, so it is easy to corrode the steel bar. Therefore, the prestressed Anchorage structure will be gradually aged and destroyed because of the influence of load and corrosion, which will lead to the gradual decrease of its durability and its ultimate failure. Therefore, it is very necessary to study the durability of prestressed Anchorage structure. By means of laboratory test, theoretical analysis and numerical simulation, this paper studies the durability of geotechnical prestressed Anchorage structure under the coupling of fatigue load and corrosion, and analyzes the influence of fatigue load and corrosion on the performance of steel bar. The failure and variation of the inner Anchorage section are studied by numerical simulation. The specific research contents are as follows: (1) carrying out fatigue and corrosion tests on steel bars for a certain period of time, numbering the steel bars into groups, applying different fatigue tensile times respectively, and placing them in different acid-base environments. The influence of fatigue load and corrosion on the performance of steel bar is obtained. The typical steel bar specimen was selected and scanned by tensile crack and electron microscope respectively. The fracture surface of steel bar was observed from macroscopic and microscopic angles. The mechanical properties and fracture characteristics of steel bars under the coupling of fatigue load and corrosion are analyzed. (2) the numerical models of prestressed Anchorage structure subjected to the coupling of fatigue load and corrosion and only fatigue load are established by PFC2D program. The variation characteristics of shear stress, axial stress and displacement field of the bolt-grouting body interface under two kinds of conditions are compared and analyzed. The mesoscopic law of bond deterioration at the interface between anchor rod and grouting body under the coupling of fatigue load and corrosion is obtained. (3) the numerical model of prestressed Anchorage structure under the coupling of fatigue load and corrosion is established by using PFC2D program. The effects of grouting strength, surrounding rock strength and anchoring length on the durability of prestressed Anchorage structure are studied, and corresponding measures to enhance the long-term durability of prestressed Anchorage structure are put forward.
【學(xué)位授予單位】:山東建筑大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU476
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