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Hydrolock
| Глоссарий по проходческим щитам (тоннелингу) |
A phenomenon that occurs when circulation is lost creating a hydraulic cylinder in front of a reamer with holding pressure greater than the pullback capacity of the drill rig.
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Phenomenon, английский
- 1. a fact or situation which can be observed 2. someone or something that is considered to be extraordinary and marvellous
- A condition with various possible causes in which the blood supply to the fingers and toes is restricted and they become cold, white and numb. also called dead man’s fingers, vasospasm [described 1862. after maurice raynaud (1834–81), french physician.] rbc rbc abbr red blood cell rcgp rcgp abbr royal college of general practitioners rcn rcn abbr royal college of nursing rcog rcog abbr royal college of obstetricians and gynaecologists rcp rcp abbr royal college of physicians
- In diabetes mellitus, a swing to a high level of glucose in the blood from an extremely low level, usually occurring after an untreated insulin reaction during the night. it is caused by the release of stress hormones to counter low glucose levels.
- Явление; эффект
Circulation, английский
- Циркуляция
- Circulation (of the blood) movement of blood around the body from the heart through the arteries to the capillaries and back to the heart through the veins she has poor circulation in her legs. rub your hands to get the circulation going. comment: blood circulates around the body, carrying oxygen from the lungs and nutrients from the liver through the arteries and capillaries to the tissues. the capillaries exchange the oxygen for waste matter such as carbon dioxide which is taken back to the lungs to be expelled. at the same time the blood obtains more oxygen in the lungs to be taken to the tissues. the circulation pattern is as follows: blood returns through the veins to the right atrium of the heart. from there it is pumped through the right ventricle into the pulmonary artery, and then into the lungs. from the lungs it returns through the pulmonary veins to the left atrium of the heart and is pumped from there through the left ventricle into the aorta and from the aorta into the other arteries.
- The passing of any liquid or gas to the end of the drill string and back to the surface in the process of drilling a borehole.
- The movement of air currents through mine openings.
- An item that is communicated to team members on a group work site, and that supports confirmation and tracking of which team members have viewed it. cisc (n)
- Caused by quick changes in pressure, cavitation is the creation of vapor cavities within a low-pressure liquid. cavitation can cause severe wear through cyclic stress on metal surfaces as they implode.
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Low load method, английский
A pipe jacking method in which separate provision is made to carry the jacking load, the pipe being installed carrying little or none of the jacking force.
Slurry tbm, английский
A microtunnel method that uses tunnel boring machine (tbm) or shield with closed face which employs hydraulic means for removing the excavated material and balances the ground water pressure.
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