(2) Strictly control the blasting quality, fill the overbreak with shotcrete, and prevent the irregular rock stratum from constraining the shrinkage and deformation of the lining.
(3) When the formwork is dismantled, the laboratory shall issue a notice of formwork dismantling, and the formwork shall not be dismantled in advance due to the deadline.
(4) Carefully design the concrete mixture ratio, reduce the water cement ratio of concrete, and reduce the hydration heat of concrete.
(5) Try to reduce the frequency of using attached vibrators, so as to avoid scratching the initial setting concrete when vibrating.
(6) The floating ballast on the side wall foundation shall be cleaned to prevent settlement cracks. When the surrounding rock changes, settlement joints should be set according to the design requirements.
(7) Sprinkle water with sprinkler or brush curing liquid for curing, so as to reduce shrinkage cracks of concrete.
(8) Carefully design and build the lining trolley to prevent the deformation and fracture of the bar of the lining trolley.
(9) Ensure the concrete conveying pressure and prevent the upper part of the lining from void and water accumulation.
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