rotational-moment-analysis-and-posture-rectification-strategy-of-shield-machine外文翻译.doc
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1、 外文翻译 第21页 1 英文Rotational Moment Analysis and PostureRectification Strategy of Shield MachineAbstract. The rolling phenomenon of the shield body occurs frequently in the process of practice construction, which could lead to the derivation of the shield machine and increase the difficulties of the ex
2、cavation control. It is mainly caused by the rotation of the cutter head. Based on this practical problem, we investigate the forces around the shield body and the cutter head. Meanwhile, the positive and negative rotary controlling techniques are developed to regulate the deviated rolling angle. Th
3、ese studies would provide theoretical basis to the further research about the whole postures rectification of the shield machine.Keywords: Shield machine, Rotation moment analysis, Rectification strategy.1 Introduction1.1 Shield Tunneling Method Shield machine is an important technique equipment in
4、basic construction and resource development, which is widely applied in tunnel, railroad, highway, mineral mountain etc underground construction. The shield tunneling method is a method to construct tunnel with shield machine. During shield excavation, the jack at the shield tail push the tunnel seg
5、ment which had been assembled where a reaction force occurred to make the shield going forward, at the same time the excavation plane must keep stabile. Comparing with cut and cover method, shield tunneling method have some merits as follows:1, Less occupied ground surface, less land expropriation c
6、ost.2, The influence of weather condition is small, so there will be longer effectiveconstruction time comparatively.3, Soft soil, sand egg soil, soft rock and the rock strata are all applicable.4, The construction speed is quick.5, The influence to the environment is small.According to the above me
7、rits, the shield tunneling method get extensive application.1.2 Rotation Posture Rectification Position and posture of shield machine is important to precision of tunnel construction during excavation. But there must have deviation from actual position and posture to desired position and posture. So
8、 the rectification of the deviation is necessary. In this paper, we do not discuss position rectification. In posture rectification, only rotation rectification is considered. Posture of shield machine is described by three parameters: the pitching angle p ,the yawing angle y and the rotation angle
9、r. The pitching anglep is the angle between shield machine axis and horizontal plane. The yawing angle is the angle between shield machine and vertical plane through the shield machine axis. The rotation angle is the angle that the shield machine rotates on the shield machine axis. In the following
10、description, replace p with . To illustrate, the following coordinate system is established.Fig. 1. Coordinate systems are established The global coordinate system CE is selected so that the z axis is vertically downwards and the x and y axes are on a horizontal plane. The x, y and z axes are perpen
11、dicular to each other and follow the right-hand rule. A machine coordinate system CM is selected so that the p axis is vertically downward when the shield being not rotate and the r axis is in the direction of the machine axis. The CM consolidate with the shield. The origin of the machine coordinate
12、 system is selected at the center of the shield tail plane. The p , q and r axes are perpendicular to each other and follow the right-hand rule. A reference coordinate system CMV is selected so that the pv axis is through the cross-line of PV and shield tail plane and the rv axis is in the direction
13、 of the machine axis. The pv and qv axes are on the shield tail plane. The pv is the vertical plane through shield axis. The origin of the reference coordinate system is selected at the center of the shield tail plane. The pv , qv and rv axes are perpendicular to each other and follow the right-hand
14、 rule. The angle between p axis and pv axis is the rotation angle . The is positive for counterclockwise rotation of shield (view from shield tail). Shield rotation posture rectification means zero when is not zero. During excavation, if is not zero, the actual jack thrust distribution will be diffe
15、rent from theoretical jack thrust distribution. That will lead to algorithm deviation. More serious condition is that is over certain threshold which will lead to propulsion failure and segment assembly failure.1.3 Previous Research In literature 1, the silt sandy ground in Shanghai area is taken as
16、 prototype, then different parameters of shield machine and ground properties be combined for testing. Based on the test results, studies are carried out to discover the variation law of thrust force, the mechanism of friction between soil and shield and its influence factors. In literature 2, soil
17、cutting force was investigated and a soil cutting force model was proposed. In literature 3,4,5, the reasonable calculation method of thrust force and its influencing factors were studied by applying mathematics and mechanics based on the working mechanism of EPB shield machine. In order to research
18、 on shield rotation rectification, a shield rotation moment model must be established. The previous research is helpful to establish the model, but no specialized research was carried on.2 Rotation Rectification Strategy The rotation rectification strategy includes four steps: rotation angle measure
19、ment, cause analysis, need to rotation rectification or not, rotation rectification. Rotation angle measurement can be measured by an inclinometer in the shield. Based on the shield rotation moment model, the reasons that cause the current rotation situation could be found out. If 1.5 , rotation rec
20、tification by counter rotation of cutter is needed. When p and y rectification is proceeding, rotation rectification is not carried on. When the shield machine is in curve alignments, rotation rectification is also not carried on. To investigate the reasons that cause the rotation situation, the shi
21、eld rotation moment model must be established.Fig. 2. Rotation rectification steps3 Modeling of the Shield Rotation Moment The loads acting on the shield are composed of four forces: force due to the selfweight of the shield F1, force due to the jack thrust F2 , force acting at the face F3 , and for
22、ce acting on the shield periphery F4 , as illustrated in Fig. 3. Corresponding to the forces, the moment around the shield axis are T1 , T2 , T3 and T4 respectively.Fig. 3. Shield loads3.1 1 T Corresponding to the Shield Self-weight F1 The point of the self-weight is on the shield axis, so there is
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- rotational moment analysis and posture rectification strategy of shield machine 外文 翻译
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