随着城市建设的迅速发展,既有高填明洞填土顶面将不可避免地出现新增结构物等二期荷载的情况。为了明确明洞回填完成后新增二期荷载对其顶部垂直土压力的影响,在已有明洞减载结构土压力计算公式的基础上,利用土体沉降弹性理论计算公式建立了土工格栅变形与土体沉降变形的关系,并考虑二期荷载作用,进一步完善了高填明洞减载前后的洞顶垂直土压力计算公式。建立数值分析模型,将数值分析结果与文中公式计算结果进行了对比。结果表明:公式计算与数值分析结果较为接近,表现出相同的规律性;有无减载措施对明洞回填土压力影响较大,填土越高,减载越显著,实际作用在明洞顶土压力越小。新增二期荷载作用下的明洞顶垂直土压力计算,应考虑其对土体沉降变形的影响,而非简单叠加。 With the rapid development of urban construction, it is inevitable that there will be the second load such as the new structure appearing on the top of the high-fill-fill fills. In order to clarify the effect of the newly added second-stage load on the vertical earth pressure at the top of the backfilled Myeong-dong, based on the calculation formula of the earth pressure in the structure of the load-bearing structure in Myeong-dong, the geogrid deformation was established by using the formula of settlement elastic theory And the settlement of soil subsidence, considering the second-stage loading, the formula of vertical earth pressure on the top of the tunnel in the high-fill-in-hole is further improved. The numerical analysis model is established, and the numerical analysis results are compared with the formula calculation results. The results show that the formula and numerical analysis are close to each other and show the same regularity. Whether the unloading measures have a significant impact on the pressure of backfill in Myeong-dong, the higher the filling time is, the more significant the loading is. Earth pressure is smaller. The calculation of the vertical earth pressure at the top of Myong-dong under the addition of the second-stage load should consider its effect on settlement and deformation of the soil mass rather than simply superposition.