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In this paper, the influence of crack of the big physical volume concrete, types of cracks, cracks reasons were comprehensive analysis, expounds the key elements of large volume concrete configuration, construction and maintenance and other aspects of the, proposed to reduce and control of crack of the big physical volume concrete technical requirements, for the same project provides theoretical reference. rapidly with the increase of crack width. Therefore, in the underground engineering should try to avoid more than 0.3mm throughout the crack of the whole section. Such cracks will greatly affect the use of the structure, chemical grouting must be carried out treatment. Stage of construction of large volume concrete temperature crack, on the one hand is the internal factors of concrete, concrete temperature difference between inside and outside influence; on the other hand is the external factors of concrete, the structure of external constraints and concrete each particle constraints to prevent shrinkage deformation of concrete, concrete compressive strength, tension small. When the temperature stress once more than the tensile strength of the concrete can bear, the cracks will appear. The width of this crack can not affect the strength of the structure, but it has an effect on the durability of the structure, so it must be paid attention and controlled. III. MASS CONCRETE CRACK TYPE Causes of cracks in the points into two categories: structure type crack is caused by the external load, including in the calculation of the conventional structure of the main stress and other structural stress caused by the stress cracks. Two is the material type crack, is by the non bearing the distortion change, is mainly by the temperature stress and the concrete contraction cause. The main discussion of material type cracks.

Cause and Influence of Mass Concrete Crack