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中文摘要：
现行的设计规范中明洞各部位土压力尤其是垂直土压力计算仍采用土柱压力，即P=γh．但是，已有研究表明这种计算方法具有一定的局限性．主要依托某明洞高回填土项目，采用室内模拟试验和现场试验相互验证的方法研究明洞顶土压力的变化规律及双向土工格栅减栽效率．通过室内外试验验证，回归出了能反映该明洞顶垂直土压力变化性状的非线性计算公式，得到了土工格栅的减载效率．最后，根据得出的非线性土压力计算公式和格栅减栽效率，推求了两种方案下各自的极限填土高度，有效地指导了该明洞顶土的继续回填．
英文摘要：
In the current design code about earth pressure calculation,especially the vertical earth pressure soil, the column method is still adopted,that is P=γh. However,the existing research shows that this cal- culation method has some limitations. On the basis of the project of high backfill soil of one Myeong-dong, the vertical loess pressure properties and the load siledding scheme of geogrid are studied by both indoor simulation test and outdoor test, and a nonlinear calculation formula is regressed, which can reflect the ver- tical earth pressure properties of this open cut tunnel, then the lightening efficiency of geogrids is obtained. Finally, according to the nonlinear earth pressure calculation formula and the grille lightening efficiency, two options fill height limits are calculated to guide the Myeong-dong continue to backfill effectively.
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