关键词: 铁路隧道, 喷射混凝土, 模筑混凝土, 平均线性超挖, 回弹率, 预留变形量, 超耗率, 应耗量

Abstract: Excessive consumption of concrete is a common problem in tunnel projects. Controlling excessive consumption of concrete is both the key and most difficult aspect of construction cost control. Accordingly, to effectively reduce construction costs, reasonably determine tunnel concrete consumption standards, and perform construction management and control, the consumption of concrete before and after construction is calculated and evaluated in terms of the cause of concrete consumption, consumption composition, consumption quantitative analysis, and the influence of the outline of the secondary lining formwork trolley. The following results are obtained. (1) The consumption of shotcrete in the primary support is mainly related to the design quantity, rebound quantity, and average linear overbreak quantity, and the theoretical consumption is approximately 1.6 to 3.8 times the design quantity. (2) The consumption of concrete for secondary lining formwork is mainly related to the design quantity and reserved deformation quantity, and when the actual reserved deformation quantity is onethird of the design reserved quantity, the theoretical consumption of concrete for secondary lining formwork is approximately 1.04 to 1.12 times the design quantity. (3) The structural strength and rigidity of the general secondary lining formwork trolley are relatively large, meeting the requirements of selfweight or impact pressure of secondary lining formwork from concrete pouring to initial setting, and the trolley contour does not need to be enlarged to prevent deformation and falling back.

Key words: railway tunnel, shotcrete, formwork concrete, average linear overbreak, rebound rate, reserved deformation, excessive consumption rate, consumption