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建造在土壤地基上的灰坑检查坑受机車动荷載作用,如同弹性半空間上的地基梁一样,应按弹性理論空間問題来計算。过去一般仅在坑的纵向取一米长来进行坑的横截面計算,横截面按挡土牆計算,未考虑坑纵向梁的整体作用,因此不能全面地正确地反映坑的受力情况。当机車荷載通过灰坑检查坑传递到地基上时,灰坑检查坑本身产生挠曲,因此这种結构应視为与土共同工作,在弹性地基上的結构物。应对坑的纵向及横向进行驗算,以保証足够的强度,否則就会因弯矩而引起坑牆开裂。实际上灰坑检查坑沿坑长度的断裂,不一定都是弯距作用,也有因地基不均匀沉陷而产生的,但是,在任何情况下都应該从計算上保証构筑物的强度。
The pit inspection pit constructed on the soil foundation is affected by the locomotive dynamic load, just like the foundation beam in the elastic half-space, it should be calculated according to the elastic theoretical space problem. In the past, the pit cross section was usually calculated by taking a meter long in the longitudinal direction of the pit. The cross section was calculated according to the retaining wall without considering the overall effect of the longitudinal beam of the pit. Therefore, the pit stress can not be fully and correctly reflected. When a locomotive load is transmitted to a foundation through a pit inspection pit, the pit inspection pit itself is deflected so that such a structure should be considered as a structure on a flexible foundation that works in co-operation with soil. The vertical and horizontal pit checks should be carried out to ensure sufficient strength, otherwise the pit wall will be cracked due to bending moment. In fact, the pits along the pit length of the pit inspection pit are not necessarily caused by the bending action, but also because of the uneven subsidence of the foundation. However, the strength of the structure should be guaranteed in any case.