Study on Optimization of Crossheading Support and Lateral Stress Evolution Law with Shallow Buried Soft Rock
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ORIGINAL PAPER
Study on Optimization of Crossheading Support and Lateral Stress Evolution Law with Shallow Buried Soft Rock Yao Lu . Yongle Liu
. Dachong Hu
Received: 23 July 2020 / Accepted: 26 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract In a shallow-buried coal mine, the original support scheme of large crossheading has features of excessive strength and resource waste. Firstly, various optimization schemes are obtained through permutation and combination, and verified through numerical simulation. Additionally, under the premise of ensuring safety and economy, the optimal scheme is determined as A3B3: For the roof support, there are 5 rockbolts in each row, with spacing of 1100 9 1000 mm. Row-spacing between anchor cables is 2200 9 2000 mm. There is 1 bolt per row for each sidewall, 1050 mm from the roof and with the spacing of 1400 mm. In order to study the evolution of lateral abutment pressure during the dynamic load stage, FLAC3D was applied. The plastic zone range from coal seam excavation to model equilibrium is
Y. Lu Y. Liu (&) College of Safety and Environmental Engineering, College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China e-mail: [email protected] Y. Lu Y. Liu State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Qingdao 266590, China D. Hu CCIC Group Gongxin Security Technology Co., LTD, Zaozhuang 277100, China
analyzed. Finally, the rationality of the design is verified by analyzing the observed of borehole television and roadway displacement. Keywords Support optimization Numerical simulation Lateral support pressure evolution
1 Introduction Bolt support is widely applied in coal mining engineering. The differences in ground stress and lithology of surrounding rock lead to the different engineering condition of roadway. So, the support needed to maintain the stability of surrounding rock varies accordingly. When the supporting strength is insufficient, local instability and collapse of the surrounding rock may occur, causing excessive deformation or even overall failures. But the excessively high strength support of coal roadway not only wastes resources and increases the expense, but also delays the construction speed and affects the benefit. Many scholars have studied the support technology of coal mine roadway with different conditions. Through experimental investigation, some scholars designed the corresponding support structure and supporting process for different tunnel conditions. Martı´n et al. (2010, 2013) conducted theoretical and experimental research in order to determining its
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constitutive law of fully grouted rockbolts. Seo et al. (2016) developed a new pillar-reinforcement method to improve pillar stability, which is crucial for the successful construction of the rainwater storage cavern. Paul et al. (2012) developed a system of support des
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