Model tests on influences of fill density on soil arching effects using transparent soil
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摘要: 土拱效应广泛存在于岩土工程中。开展基于透明土的活动门试验，研究填土密实度对土拱效应演化的影响。研究表明，密实度较低的填土，较小的相对位移就可以达到土拱稳定阶段，提高填土密实度有利于土拱效应的发挥；填土密实度对内拱高度无影响，但对外拱有显著影响；相对位移在0~3%时，位移反射率迅速上升，而后逐渐趋稳，提高密实度有利于减弱基地差异沉降向上反射。研究将为填土密实度对土拱演化过程的影响提供参考。Abstract: The soil arching effect commonly exists in geotechnical engineering. The trapdoor tests are conducted using transparent soil to study the influences of fill density on the soil arching effect. The results show that under the lower compactness of the fill, the smaller relative displacement can reach the steady stage of soil arching, and improving the compactness of the fill can reinforce the soil arching effect. The fill density has no influences on the height of the inner arch, but significant influences on the outer arch. When the relative displacement is between 0% and 3%, the displacement reflectivity increases rapidly, and then gradually reaches a constant. Improving the fill density is beneficial to weakening the reflection of differential settlement. This study may provide a references for the influence of fill density on the evolution of soil arching.
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Keywords:
- transparent soil /
- soil arching effect /
- fill density /
- trapdoor test
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表 1 试验方案
Table 1 Test plans
编号 B/mm H/mm Δ/B 拱数 填土密实度/% T1 100 300(H/B=3) 0.2 3 50 T2 100 300(H/B=3) 0.2 3 85 注：B为活动门宽度，H为填土高度，Δ为活动门位移。 
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