Research Status and Trends of Large Deformation Rock Bolts in China
Received date: 2019-06-27
Revised date: 2019-10-09
Online published: 2020-02-26
The large deformation rock bolt overcomes the small deformation failure behavior of the traditional bolt，and can effectively solve the support and disaster prevention problems of the weak surrounding rock，the deep buried rheological rock and the rockburst area.It is a hot research topic in deep engineering technology. In order to summarize the research and development status of large deformation rock bolts in China，discuss the bottleneck problems faced by current research and development，grasp the possible trends of future development，and summarize the development process of large deformation rock bolts at China and abroad，the existing 50 typical designs in China were summarized and analyzed.The scheme proposed a type division suggestion based on the action mechanism； five typical schemes of different types were selected to further analyze the advantages and disadvantages of each type of large deformation rock bolts； on this basis，the main problems of the prior art scheme were discussed.Based on this，some understandings on future research and development trends were proposed.The research indicates that the large deformation bolts in China can be divided into 3 types，these are structural type，material intrinsic type and other type.Among them，the main feature of the structural type is that it contains a certain structure，which provides support resistance through sliding of the structure and coordinated deformation of the rock mass.The amount of deformation of the structure is the amount of stretching of the rock bolts. Such rock bolts can be subdivided into three sub-classes of friction type，shear type and piston type； the material type is to optimize the deformation characteristics of the material of the bolt by using the preferred anchor material or designing a certain structure.The yield strength and yield deformation are the support and ultimate deformation of the bolt； the structural type is the main solution in China，further optimizing the structure，optimizing the bolt material，improving the manufacturing process，and ensuring the product quality stability.For the research of material intrinsic bolt, it is important to focus on the development and application of new rod materials, such as negative Poisson’s ratio materials, which is also one of the most potential directions for the development of large-deformation anchors. The combination of deformation bolt technology and the development of large deformation anchors with monitoring function are conducive to the continuous monitoring of disturbance stress and convergence deformation of surrounding rock in the whole life cycle of underground engineering. It is one of the research directions worthy of attention in the future.
He WANG , He CHEN , Hui CAO . Research Status and Trends of Large Deformation Rock Bolts in China[J]. Gold Science and Technology, 2020 , 28(1) : 112 -123 . DOI: 10.11872/j.issn.1005-2518.2020.01.074
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