Rockburst mechanism research and its control
|نوع نگارش مقاله||
scopus – master journals – JCR
۴٫۲۷۶ در سال ۲۰۲۰
۲۶ در سال ۲۰۲۱
۰٫۹۰۱ در سال ۲۰۲۰
|شاخص Quartile (چارک)||
Q1 در سال ۲۰۲۰
خرید محصول توسط کلیه کارت های شتاب امکان پذیر است و بلافاصله پس از خرید، لینک دانلود محصول در اختیار شما قرار خواهد گرفت و هر گونه فروش در سایت های دیگر قابل پیگیری خواهد بود.
فهرست مطالب مقاله:
A new rockburst classification, innovative works in developing a ‘‘strainburst test machine” and an
‘‘impact-induced rockburst test machine” that can reproduce rockbursts in laboratory were researched. New concepts were proposed regarding the stress paths that take into account both the static and dynamic stresses analogous to that at excavation boundaries for generating artificially-induced strain- burst and impact-induced rockburst. As an important method for rockburst control, a novel energy- absorbing bolt was developed, which has a constant-resistance under both static and impact loadings and a large-elongation capacity for containing large deformations of rock masses under burst-prone conditions.
|بخشی از متن مقاله:|
Rockburst frequently occurs at excavation faces or on a working panel of an underground excavation at great depth. In last years, the rockburst phenomena have been investigated by many researchers through theoretical, numerical, and experimental approaches [1–
۶]. It is critical to understand the phenomenon of rockburst and to focus on the patterns of occurrence of these events.
There are several rockburst mechanisms. The main factors are usually associated with local underground geometry and with the geology [7–۹]. Rockbursts normally occur in mining operations and in civil works. The most common phenomenon is strainburst- ing, although buckling may also occur. In addition, impact-induced rockbursts can occur in less stressed rock formations, caused by blasting and excavation of adjacent cavities.
Some researchers have conducted experimental studies on rockburst using uniaxial compression tests, combined uniaxial and biaxial static-dynamic tests, true triaxial loading tests, and conventional triaxial unloading tests [10–۱۳]. Also some research- ers have promoted the use of acoustic emission (AE) monitoring technology to study rockburst mechanisms [2,14].
A new method for studying strainburst involves the use of a modified true triaxial apparatus that can unload the test specimen on one surface . The test system can be used to simulate strain- burst in laboratory. Another new method for studying impact- induced rockbursts involves the use of a modified true triaxial apparatus that can load both static and dynamic on one, two or
three surfaces of the specimen. Details of the two test systems will be presented in Section 3.
In addition to understanding rockburst mechanisms, controlling rockburst damage is important for the safety of mining operations and underground structures. Rock support using bolts and anchors, which has the roles such as reinforcement of rocks, holding, and retaining fractured rocks, is an efficient measure for rockburst con- trol in underground excavations .
Researchers worldwide have developed some dynamic rockbolts [16,17]. The MCB conebolt developed in Canada has been successfully used in Canadian hard rock mines and in some other countries. Another rock bolt (Roofex) was developed for soft rock tunneling and it is capable of maintaining a constant resistance when the supported rock masses undergo large deformations. This bolt has a maximum extension up to 300 mm and a constant resis- tance force of 80 kN. As mining depths increase, there are demands for anchor bolts with larger extension and higher loading capaci- ties. In Section 4, a state-of-the-art anchor and bolt technology– the constant resistance large deformation (CRLD) bolt or anchor, developed by the State Key Laboratory for Geomechanics and Deep Underground Engineering (SKLGDUE) at China University of Mining and Technology, Beijing (CUMTB), is introduced. Field tests were performed in a coalmine in China to demonstrate the effectiveness of the CRLD cable.
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