Mechanism and Application of Pre-stressed Grouting Bolt with Constant Resistance and Large Deformation
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ORIGINAL PAPER
Mechanism and Application of Pre-stressed Grouting Bolt with Constant Resistance and Large Deformation Pengfei Jiang . Suolin Jing . Peng Li . Donghe Qi . Jinhai Liu . Xiaogang Deng . Hailiang Zhang
Received: 23 August 2019 / Accepted: 5 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract To study the mechanical properties and its application of the pre-stressed grouting bolt with constant resistance and large deformation (PGBCRLD), the cavity expansion theory and other related mechanical methods were used to calculate and develop the constitutive equation of the grouting bolt. Meanwhile, bolt supporting resistance, tensile deformation and support effect were analyzed and verified by the pull-out test and field practice. The results indicated that properties of the bolt cone end and the
P. Jiang S. Jing (&) P. Li (&) College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China e-mail: [email protected] P. Li e-mail: [email protected] D. Qi Zhubai Coal Mine, Linyi Mining Group Co. Ltd, Tancheng 276100, Shandong, China J. Liu North China Institute of Science and Technology, Langfang 065201, Hebei, China X. Deng Linyi Mining Group Co. Ltd, Linyi 276017, Shandong, China H. Zhang Shanghaimiao Coal Mine, Linyi Mining Group Co. Ltd, Ordos 016299, Inner Mongolia, China
strength of surrounding rock were the main factors which influence the support effect of bolts. And when the value of drawing force was more than 220 kN and constant in the pull-out test, the elongating of grouting bolt was up to 75–80% higher than the common one, and good support resistance was maintained. Therefore, the design of grouting structure could control large deformation of surrounding rock effectively, soft rock in particular, and provided a tool to effective control of disaster accidents in coal mine. Keywords Grouting bolt Mechanism Constant resistance Large deformation Soft rock
1 Introduction As an effective way in supporting, bolting can significantly improve the stability by improving the structure of surrounding rock, which is widely used in mining, construction and other engineering fields (He et al. 2016; Wen et al. 2018; Yu et al. 2014). There are some problems in bolting. Firstly, the surrounding rock is broken seriously under high stress, leading to further damage in rock and causing the decrease of the anchoring force in anchorage zone, and even the failure of the support. Secondly, tensile failure is caused because the bolt can not accommodate the large deformation of surrounding rock (Kang 2011; Sun et al. 2014; Lu et al. 2013), as showed in the
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Geotech Geol Eng
Fig. 1 Underground roadway after surrounding rock deformation
Fig. 1. Both domestic and international scholars have studied mechanism of bolts action with constant resistance and large deformation under the tension, these studies have provided technical support for further study (Kang et al. 2014; Han et al. 2011). In 19
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