输电塔回填土基础计算露头调整方法

Calculation Method of Outcrop Adjustment for Backfilling Foundation of Transmission Tower

此文介绍了输电塔回填土基础在上拔计算时对表层较差土壤的考虑方法。通过计算表明,输电塔回填土基础在上拔计算时,上覆较差土壤的性质对其计算露头的考虑方法影响较大。对典型的下层为粉质粘土的地质条件,上覆土壤为粉土和素填土时,可分别将粉土和素填土厚度的20%和50%作为计算露头的增加值,然后按照粉质粘土计算基础的上拔。在斜坡地形情况下,若因地形而增加的计算露头高度大于上覆较差土层的厚度时,可不再考虑上覆较差土层的影响;在梯田坎子地形情况下,可以偏于安全的在因地形增加计算露头的同时,再考虑上覆较差土层的折算厚度作为计算露头。

This paper has introduced methods for worse soil of the surface layer when up-pull was calculated based on backfilling foundation of transmission tower.If the up-pull calculation was based on backfilling foundation of transmission tower,the nature of the overlying worse soil imposes quite large influence on considerations for outcrop calculation.For typical geological conditions when the lower layer is silty clay,when overlying soil is silt and plain fill,20% and 50% of the thickness of silt and plain fill can be used as value added to calculate outcrop respectively,and then up-pull as the calculation foundation of silty clay.In the case of slope topography,when the increased height of the outcrop is larger than the thickness of the worse overlaying soil layer,the influence of the overlaying worse layer could be no longer considered.In the case of terraced fields and ridge terrain,the converted thickness of the overlaying worse soil layer can be considered while calculating outcrop for increased terrain safety.