Development and Application of Micro Automatic Excavation Device for Model Test of Underground Engineering
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ORIGINAL PAPER
Development and Application of Micro Automatic Excavation Device for Model Test of Underground Engineering Chuan-cheng Liu . Qiang-yong Zhang . Wen Xiang
Received: 2 March 2020 / Accepted: 27 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract In the model test of underground engineering, how to carry out the automatic excavation of different types of tunnel and small caverns is still a technical challenge at present. In this paper, we designed and developed the micro automatic excavation device, including the cutting type automatic excavation device and the crushing type automatic excavation device for model test of underground engineering by using servo electric control technology. The device has high excavation accuracy. With the aid of this device, the excavation of cavern with any shape can be conducted. This device can carry out not only full section automatic excavation, but also bench method automatic excavation. The device has been successfully applied in the three-dimensional geomechanical model test of the excavation for the cavern groups in an underground laboratory. After the excavation of the model cavern, the wall of the cavern is smooth, and the intersection position and angle between the caverns are accurate. Compared with the design size, the excavation error of all caverns is within ± 5 %, which meets the design requirements. C. Liu (&) Q. Zhang Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, People’s Republic of China e-mail: [email protected] W. Xiang School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, People’s Republic of China
It provides technical support for accurate excavation test of model test meanwhile provides a strong technical guarantee for the fine simulation of the deformation characteristics and failure laws of deep underground caverns. Keywords Underground engineering Servo electric control technology Micro automatic excavation device Geomechanical model test
1 Introduction The needs of human survival and development as well as the exploration of the unknown world make human beings expand the underground activity space continuously, so it is necessary to study the damage mechanism and disaster conditions of deep caverns (Sellers and Klerck 2000; Guzev and Paroshin 2001; Reva 2002; Duan et al. 2019). The geomechanical model test is an important means to study the stability of surrounding rock of large-scale underground cavern group structure and the optimization design of support system, and to verify the numerical simulation results and reasonable construction scheme (Zhang et al. 2019a). Because the geomechanical model test is based on the similarity principle to study the specific engineering geological problems in a certain scale, the small excavation error in the model test will cause a great deviation from the actual project. Therefore, how
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Geotech Geol Eng
to carry out the accurate excavation of differe
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