[논문]추력에 따른 동작 유체의 거동에 있어 쉴드 TBM 추진잭의 안정성에 대한 연구

이현석; 나영민; 장현수; 석익현; 강신현; 김훈태; 박종규

doi:10.14775/ksmpe.2019.18.1.038

추력에 따른 동작 유체의 거동에 있어 쉴드 TBM 추진잭의 안정성에 대한 연구
A Study on the Stability of Shield TBM Thrust Jack in the Behavior of Operating Fluid According to Thrust Force 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.1, 2019년, pp.38 - 45

이현석 (창원대학교 기계공학과) , 나영민 (창원대학교 기계공학과) , 장현수 (창원대학교 기계공학과) , 석익현 (창원대학교 기계공학과) , 강신현 (이엠코리아 (주)) , 김훈태 (이엠코리아 (주)) , 박종규 (창원대학교 기계공학과)

Abstract ▼ AI-Helper

In this paper, the stability of the tunnel boring machine (TBM), used in tunnel excavation, according to the thrust force of the thrust jack was investigated. The existing hydraulic cylinder analysis method is fluid-structure interaction (FSI) analysis, where all of the flow setting and dynamic characteristics should be considered. Therefore, there is a need for a method to solve this problem simply and quickly. To facilitate this, the theoretical pressure in the hydraulic cylinder was calculated and compared with the analytical and experimental results. In the case of the analysis, the pressure generated inside the cylinder was analyzed statically, considering the operating characteristics of the shield TBM, and the stress and pressure were calculated. This method simplifies the analysis environment and shortens the analysis time compared to the existing analysis method. The obtained theoretical and analytical data were compared with the measured data during actual tunneling, and the analysis and experimental data showed a relative error of approximately 23.89%.

주제어

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가설 설정

In this regard, this study considered the operation characteristics of the TBM to calculate the pressure that occurs in the working fluid of the cylinder due to the thrust force. The forward speed of the hydraulic cylinder of the TBM manufactured by the company is 57 mm/min, which moves the TBM forward approximately at a rate of 1mm per sec.

제안 방법

5. As mentioned in Section 2, this study aimed to analyze the pressure that occurred in the working fluid inside the chamber, as well as the stress due to the pressure, while excluding the inlet and outlet of the working fluid. Software COMSOL Multiphysics was used, the cylinder's material was SCM 440, and the working fluid was non-compressive oil.
For the experimental method, a comparison was conducted with the data accumulated during tunneling conducted from Shin Boryeong to Yeongseo in tunnel construction for power cables by the Korean electric power corporation (KEPCO). The specifications of the TBM used in tunneling are presented in Table 3, and data were measured and extracted by sensors attached to the thrust jack from 07:50 to 23:26 on September 17, 2017.
FSI analysis, which was used to verify the operation characteristics of hydraulic cylinders, was generally accompanied by the dynamic characteristics. However, this study analyzed the operation characteristics statically by reflecting the operation characteristics of the thrust jack.
It was created with 153,449 nodes when the analysis values started to converge. In addition, the mesh whose value had not converged was re-created through the adaptive mesh refinement function to increase the accuracy of the analysis. The analysis time was zero to 10 sec with increments of one sec.
In this regard, this study aimed to calculate the working fluid pressure according to the thrust force of the thrust jack in the FSI analysis; it did so while changing the analysis conditions, thereby verifying the structural stability of the thrust jack. The specifications of the hydraulic cylinder that were applied to the TBM by the company were employed in the thrust jack.
Using this, a theoretical derivation and analysis environment are constructed. That is, the pressure applied to the given hydraulic jacking device is theoretically derived, and its stability is determined through a comparison between FSI analysis and experimental measurements.
The aforementioned studies analyzed the behavior and reaction force that occurred when a rod pushed working fluid and it moved. Their studies verified the stress distribution of actuators and evaluated their structural stability. However, their analysis methods require the boundary conditions of liquid flow and should consider the dynamic characteristics according to the fluid movement as well.
This study verifies the stability of the thrust jack used in tunneling in a shielded TBM by calculating the pressure applied to its fluid. FSI analysis, which was used to verify the operation characteristics of hydraulic cylinders, was generally accompanied by the dynamic characteristics.

이론/모형

The pressure (σ)applied to the fluid can be calculated by the Pascal’s principle, which is as follows, assuming that a constant pressure is applied to the whole area of the chamber.

성능/효과

Pressure occurred when a force was applied to a non-compressive fluid in the hydraulic cylinder used by the company; it was calculated in the FSI analysis, and the force varied in a range of 270 to 390 kN. The analysis results verified that the maximum stress and fluid pressure, occurring at 390 kN, were 28 and 12 MPa, respectively. Since the yield stress of SCM 440 was known to be 570 MPa, this cylinder was regarded as stable.
The experiments were based on data measured during tunneling conducted by the company, and the relative error between analysis and experimental values was calculated to be 23.89% on average. This error was due to the friction and viscosity that were not taken into consideration in the analysis, and this study verified that a more simplified method of analysis could be possible in the future.
10 shows the comparison graph of theoretical, analytical, and experimental results. The mean error between the analysis and experimental values was around 23.89%, which was due to the difference in actual driving environments, that is, changes in thrust force caused by the ground strength.

후속연구

89% on average. This error was due to the friction and viscosity that were not taken into consideration in the analysis, and this study verified that a more simplified method of analysis could be possible in the future. In future studies, both friction and viscosity will be taken into consideration to raise analysis accuracy.

참고문헌 (14)

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상세보기
10.1002/geot.201200032 Schubert, W., Lauffer. H., “NATM - from a construction method to a system,” Geomechanics and Tunnelling , Vol. 5, No. 5, pp. 455 - 463, 2012.

상세보기
10.1016/j.tust.2016.01.020 Yokota, Y., Yamamoto, T., Shirasagi, S., Koizu, mi. Y, Descour. J., Kohlhaas, M., “Evaluation of geological conditions ahead of TBM tunnel using wireless seismic reflector tracing system,” Tunn elling and Underground Space Technology, Vol. 57, pp. 85 - 90, 2016.

상세보기
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상세보기
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원문보기 상세보기
10.14775/ksmpe.2016.16.1.042 Yeo, D. H., Park, D. G., Byon, S. M., “CFD Analysis on Stent Shape to Reduce Blood Flowing into Cerebral Aneurysm,” Journal of the Korean Society of Manufacturing Process Engineers, Vol. 16, No. 1, pp. 42-50, 2017.

원문보기 상세보기
10.14775/ksmpe.2016.15.1.008 Kuk, Y. H., Choi, H. J., “Analysis of Fluid-Structure Interaction of Cleaning System of Micro Drill Bits,” Journal of the Korean Society of Manufacturing Process Engineers, Vol. 15, No. 1, pp. 8 - 13, 2016.

원문보기 상세보기
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원문보기 상세보기
Kim, J. H., Han, S. M., Kim, Y. J., “Motion Characteristics of Hydraulic Actuator with Variou s Cushion Shapes Using Fluid-Structure Interaction Method,” The 70th Anniversary Conference of the Korean Society of Mechanical Engineers. pp. 2636 - 2641, 2015.
Kim, T. O., "Coupled Flow-Structural Analysis of Rack and Pinion Type Hydraulic Actuator," A Thesis for a Master’s Degree, Gyeongsang National University, Republic of Korea, 2017.
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