دانلود رایگان مقاله روش و سیستم جدید آزمایش برای تغییر شکل پیرامونی نمونه های استاندارد استوانه ای در مکانیک ژئوتکنیکی و کاربرد آن – سال 2020
مشخصات مقاله:
عنوان فارسی مقاله:
یک روش و سیستم جدید آزمایش برای تغییر شکل پیرامونی نمونه های استاندارد استوانه ای در مکانیک ژئوتکنیکی و کاربرد آن
عنوان انگلیسی مقاله:
A new test method and system for the circumferential deformation of cylindrical standard specimens in geotechnical mechanics and its application
کلمات کلیدی مقاله:
مکانیک ژئوتکنیک، نمونه استوانه استاندارد، تغییر شکل محور، روش آزمون، توسعه سیستم
کلمات کلیدی انگلیسی:
Geotechnical mechanics – Standard cylindrical specimens – Circumferential deformation – Test method – System development
مناسب برای رشته های دانشگاهی زیر:
مهندسی عمران
مناسب برای گرایش های دانشگاهی زیر:
ژئوتکنیک
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Graphical abstract
Keywords
1. Introduction
2. System composition and testing principle and method
2.1. System composition
2.2. Principle and method
3. Main dimensions and technical advantages
3.1. Main dimensions
3.2. Technical advantages
4. Verification test and discussion
4.1. Test scheme
4.2. Result and discussion
5. System application
5.1. Test material
5.2. Test apparatus
5.3. Test scheme
5.4. Results
5.5. Discussion
6. Conclusions
Declaration of Competing Interest
Acknowledgements
References
قسمتی از مقاله انگلیسی:
1. Introduction
Rock mechanics laboratory test, as the main analysis and monitoring method to study the complex natural structure and physical and mechanical properties of rocks, plays a decisive role in the design and construction of rock engineering. Deformation monitoring of cylindrical standard specimens is one of the basic physical monitoring parameters in rock mechanics laboratory tests, and it is very important to study the mechanical properties of rocks under environmental and loading conditions Thomas Young found that the longitudinal deformation of materials was accompanied by the circumferential deformation in the tensile and compression tests in 1807. Simeon Denis Poisson put forward the concept of the elastic constant in 1829, Poisson’s ratio. Research shows that the circumferential deformation of rock samples deviates from the linear relationship between the circumferential deformation and the axial stress earlier and faster than that between the axial deformation and the axial stress under uniaxial compression [1,2]. However, further research is lacking due to the difficulty in monitoring the circumferential deformation in the elastic stage, especially in the post-peak plastic stage. At present, the measurement methods for circumferential deformation in rock mechanics tests can be divided into two categories: non-contact methods and contact methods. Non-contact measurement methods mainly include the optical interferometry method, the photoconductive thermoplastic holography method and the digital speckle in-plane correlation method (DSCM) [3,4]. For example, Seebacher et al. obtained the Young’s modulus and Poisson’s ratio of the materials using the holography method [5]. Yamaguchi proposed a non-contact laser speckle strain gauge [6]. The full-field and local displacements of the two groups of concrete specimens in the bending fatigue test were obtained by DSCM [7]. The three-dimensional displacement and strain of the sandstone before and after the deformation in the three-point bending test were obtained based on the DSCM, and the initial load and subcritical crack growth length were verified [8]. However, the disadvantages of this method are that the cost of the system is high, and the accuracy is greatly affected by external factors such as light, environment, operation and so on.
