scholarly journals Influence Factors of Vibration Response on Supporting-Thrusting System of Tunnel Boring Machine

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yongbing Mei ◽  
Yimin Xia ◽  
Laikuang Lin ◽  
Yongliang Cheng ◽  
Cong Qian
Keyword(s):  
Influence Factors ◽  
Tunnel Boring Machine ◽  
Vertical Vibration ◽  
Surrounding Rock ◽  
Vibration Response ◽  
Main Beam ◽  
Support Pressure ◽  
Vibration Acceleration ◽  
Tunnel Boring ◽  
Input Load

A supporting-thrusting system is the main load-bearing component of a tunnel boring machine (TBM) and the centralization of vibration response under TBM working. This study combines the structure and working principle of the supporting-thrusting system. Based on the vibration theory and test results at a construction site, the main influence factors of the vibration response of the supporting-thrusting system are the main beam structure, the characteristic parameters of advance cylinder, and the support pressure to surrounding rock. Under the different influence factors, the vibration response of the supporting-thrusting system is calculated and analyzed via computer simulation. The results indicate that, under the equivalent input-load on the TBM and increase in the length of the front main beam, the vibration acceleration at the front area of the TBM increases. The change rate of vertical vibration will be maximum, while the vibration acceleration at the rear area of TBM decreases. When the structure size of the thrusting cylinder increases, the vibration acceleration on the main beam decreases and those of the gripper shoe and saddle frame increase. However, the response to the axis vibration is the most sensitive. As the horizontal support pressure to the surrounding rock increases, the vibration acceleration on supporting-thrusting system decreases. When the level of support pressure exceeds 1.6e4 kN, the vibration acceleration changes gradually. These results provide a reference for designing and operating TBM parameters.

Vibration response law of existing buildings affected by subway tunnel boring machine excavation

2022 ◽  
Vol 120 ◽  
pp. 104318
Author(s):  
Ke Wu ◽  
Yang Zheng ◽  
Shuchen Li ◽  
Jie Sun ◽  
Yucong Han ◽  
...  
Keyword(s):  
Tunnel Boring Machine ◽  
Vibration Response ◽  
Existing Buildings ◽  
Subway Tunnel ◽  
Tunnel Boring

Monitoring and Reinforcement Technology of Passing Weak and Broken Rock Strata for Tunnel Boring Machine

2012 ◽  
Vol 204-208 ◽  
pp. 2819-2823
Author(s):  
Tao Li ◽  
Kai Bin Liu ◽  
Wei Hong Yang ◽  
Bo Liu ◽  
Ying Chao Liu
Keyword(s):  
Tunnel Boring Machine ◽  
Stability Control ◽  
Surrounding Rock ◽  
Tunnel Boring ◽  
Rock Stability ◽  
Tunnel Convergence ◽  
Geological Conditions ◽  
The Stability ◽  
Large Tunnel ◽  
Rock Strata

The stability control of surrounding rock is a relatively important problem in tunnel boring machine (TBM) construction. The tunnel convergence deformation value was monitored in field while TBM passing weak and broken section of hydraulic tunnel. The correlation between tunnel convergence and surrounding rock stability is analyzed. The monitoring results show that: the characteristic of weak and broken Strata is closely correlated with some geological conditions, such as fault development, intrusive contact of orthophyre and lamprophyre veins. These supporting measures can well ensure the stability of surrounding rock in weak and broken section, such as sealing the inverted arch by using concrete of C25,reinforcing the inverted arch by steel arch of I10 and anchor construction in the roof. There is great difference between the properties of the weak and broken rocks on both sides, which is the main reason of the large tunnel convergence deformation. The monitoring results can provide reference for similar engineering in the future.

scholarly journals On the Loads for Strength Design of Cutterhead of Full Face Rock Tunnel Boring Machine

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Meidong Han ◽  
Zongxi Cai ◽  
Chuanyong Qu
Keyword(s):  
Three Dimensional ◽  
Influence Factors ◽  
Tunnel Boring Machine ◽  
Element Model ◽  
Rock Breaking ◽  
Strength Properties ◽  
Tunnel Boring ◽  
Strength Design ◽  
Full Face ◽  
Rock Tunnel

AbstractCutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine (TBM). Due to the brittle rock-breaking mechanism, the excavation loads acting on cutters fluctuate strongly and show some randomness. The conventional method that using combinations of some special static loads to perform the strength design of TBM cutterhead may lead to strength failure during working practice. In this paper, a three-dimensional finite element model for coupled Cutterhead–Rock is developed to determine the cutterhead loads. Then the distribution characteristics and the influence factors of cutterhead loads are analyzed based on the numerical results. It is found that, as time changes, the normal and tangential forces acting on cutters and the total torque acting on the cutterhead approximately distribute log normally, while the total thrusts acting on the cutterhead approximately show a normal distribution. Furthermore, the statistical average values of cutterhead loads are proportional to the uniaxial compressive strength (UCS) of cutting rocks. The values also change with the penetration and the diameter of cutterhead following a power function. Based on these findings, we propose a three-parameter model for the mean of cutterhead loads and a method of generating the random cutter forces. Then the strength properties of a typical cutterhead are analyzed in detail using loads generated by the new method. The optimized cutterhead has been successfully applied in engineering. The method in this paper may provide a useful reference for the strength design of TBM cutterhead.

Dynamic analysis and vibration reduction of mechanical-hydraulic coupled tunnel boring machine (TBM) main drive system

2021 ◽  
pp. 095440622110293
Author(s):  
Zhange Zhang ◽  
Wenbo Ji ◽  
Bowen Yang ◽  
Junzhou Huo ◽  
Xuanxuan Li
Keyword(s):  
Dynamic Model ◽  
Working Conditions ◽  
Vibration Reduction ◽  
Tunnel Boring Machine ◽  
Drive System ◽  
Damping Coefficient ◽  
Main Beam ◽  
Tunnel Boring ◽  
Axial Acceleration ◽  
Main Drive System

Tunnel Boring Machine always works in the changeable geologies with multiple drivers, which leads to severe vibration of the TBM main drive system and key component failures. The vibration characteristics of TBM under different working conditions and the vibration reduction analysis have important meanings. First of all, by considering the time-varying random loads of the cutters, the contact force of the gears, the stiffness of the main bearing, and the stiffness of the cylinders, a mechanical-hydraulic coupling nonlinear dynamic model of the TBM main drive system was built according to the assembly relationship and load transmission path of the main drive system. Secondly, the dynamic model of the TBM main drive system is verified by comparing the theoretical vibration with the real vibration of the TBM main drive system. The error of the vibration acceleration is 10% to 30%. Three typical loads are defined under typical working conditions, and the vibrations of the TBM main drive system under three typical loads were analyzed. Finally, the sensitivity analysis of the cylinder damping shows that the damping at the position of the propulsion cylinder has a great influence on the vibration of the TBM main drive system. The results show that when the damping coefficient is 2.5 × 106 N·s/m, the maximum reduction of axial acceleration of cutterhead is 0.64 g, and that of the main beam front section is 0.55 g. The variable damping coefficient vibration reduction strategies under three typical loads are verified.

scholarly journals Vibration Response Characteristics and Application of Existing Railway Subgrade

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Junyun Zhang ◽  
Zhuoling He ◽  
Siyuan Chen ◽  
Le Zhang
Keyword(s):  
Vertical Vibration ◽  
Vibration Response ◽  
Disease Assessment ◽  
Horizontal Distance ◽  
Acceleration Response ◽  
Vibration Acceleration ◽  
Response Characteristics ◽  
Attenuation Law ◽  
Before And After ◽  
Research Studies

The existing conventional methods of subgrade disease assessment are not suitable for the existing lines. There are many research studies on the vibration response and attenuation law of the railway subgrade, but few research studies focus on the vibration response and attenuation law caused by the weak subgrade. In this study, vibration response tests were carried out at different positions and depths of the subgrade before and after reinforcement improvement. The results show that vibration response near the ballast is obvious, and it attenuates with the increase of the horizontal distance from the rail; the vibration acceleration response of the subgrade after reinforcement changes greatly; the vibration response curve of the reinforced section is spindle shaped, and the vertical vibration acceleration response attenuates obviously at the depth of 6.5 m, only about 10% to 30% of the surface; the vibration acceleration of the subgrade with reinforcement at the depth of 4.5 m attenuates to 60% of the surface; the vibration acceleration of the subgrade without reinforcement at the depth of 4.5 m attenuates to 50%–60% of the surface.

Field Measurement and Analysis of Vibration Response in the Metro Shield Tunnel with Straight Joint

2013 ◽  
Vol 838-841 ◽  
pp. 1363-1369
Author(s):  
Ming Yu Li ◽  
Yuan Cheng Guo
Keyword(s):  
Response Time ◽  
Vertical Vibration ◽  
Vibration Response ◽  
Structural Vibration ◽  
Shield Tunnel ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Steel Spring ◽  
Measurement And Analysis ◽  
Standard Block

Appling the M8 as the monitor objects and choosing the single-round shield tunnel with or without the steel spring floating slab and the DOT shield tunnel with straight joint as the research objects, the vertical vibration response of the track bed and the standard block in different conditions was compared. The peak vibration acceleration of two measuring points and vibration response time of the standard block in the DOT is smaller compared with the DOT and the single-round shield tunnel when a single train is through the monitoring section. Vibration response time and intensity of the DOT structure is increasing with two trains intersection. Compared to the other two shield tunnels, structural vibration response of the single-round shield tunnel is significantly decreased by the isolation effect of steel spring floating slab. For the vibration acceleration of the track bed and the standard block in the three types of shield tunnels, spectrum range is 0Hz~150Hz, and peak acceleration is in the same frequency range, which is 35Hz~70Hz. Peak vibration acceleration of the track bed is greater than that of the standard block.

Transient Property Improvement of Hydraulic Cylinder Control for Tunnel Boring Machine Using Opposite Reference Filter

2020 ◽  
Vol 140 (3) ◽  
pp. 320-325
Author(s):  
Yoshihiro Ohnishi ◽  
Takahisa Shigematsu ◽  
Takuma Kawai ◽  
Shinichi Kawamura ◽  
Noboru Oda
Keyword(s):  
Tunnel Boring Machine ◽  
Hydraulic Cylinder ◽  
Tunnel Boring

Integral hoisting technology of tunnel boring machine in limited space

2016 ◽  
Vol 33 (3) ◽  
pp. 317
Author(s):  
Fei Wang ◽  
Mengbo Liu ◽  
Long Chen ◽  
Wen Liu ◽  
Linmeng Tang
Keyword(s):  
Tunnel Boring Machine ◽  
Tunnel Boring ◽  
Limited Space

A Newly Developed State-of-the-Art Full-Scale Excavation Testing Apparatus for Tunnel Boring Machine (TBM)

2021 ◽  
Author(s):  
Gi-Jun Lee ◽  
Hee-Hwan Ryu ◽  
Tae-Hyuk Kwon ◽  
Gye-Chun Cho ◽  
Kyoung-Yul Kim ◽  
...  
Keyword(s):  
State Of The Art ◽  
Tunnel Boring Machine ◽  
Full Scale ◽  
Testing Apparatus ◽  
Tunnel Boring
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