The phrase "a big deformation" is correct and usable in written English.
It can be used in contexts related to physics, engineering, or materials science when discussing significant changes in shape or structure.
Example: "The metal showed a big deformation after being subjected to extreme pressure during the test."
Alternatives: "a large deformation" or "a significant deformation."
The excavation released the normal stress on the bedding, which caused a big deformation.
During the construction, a big deformation occurred at the upstream area (S13 + 493.0 S13 + 630.0).
The construction was started in February 2009, but a big deformation was observed in branch tunnels 2, 4, and 6.
A big deformation occurred and the advance was very slow with an average monthly advance of 21 m.
A big deformation was observed during the tunneling with a maximum deformation of 2.0 m, causing great difficulty and severe delay.
The tunnel was in phyllite, shotcrete cracks and steel arch distortion were observed, and a big deformation with a maximum of 2.0 m was monitored during the initial stage of the construction.
To avoid big deformation, a construction principle was established for the tunneling including the following: (1) Effort should be made to provide confinement pressure to the rock.
Big deformation with a maximum up to 2.0 m was observed in the tunneling of the diversion tunnel of Dongsong Hydropower Station.
The occurrence of big deformation in tunneling had become a serious problem since 1906 when an extremely big deformation was found in the Simplon Tunnel that is located between Italy and Switzerland [1, 2].
By integrating literature reviews, site observation, field monitoring, theoretical analysis, summarization, etc., a construction strategy was proposed and verified for tunneling with big deformation in this paper.
Based on the site observation and laboratory test results, a set of tunneling strategies was proposed to overcome the big deformation problem.
