路基地段卵石地层轨道降低独立接地电阻值方法

Method for Reducing Independent Grounding Resistance Value of Pebbles Stratum Track in Subgrade

高速铁路路基地段贯通地线接入处的接地电阻不应大于1Ω,本文针对卵石地层土壤电阻率高,在此条件下设置独立接地装置难以符合设计要求,若采取换填,则成本支出过高且工程量较大,必须采取其他有效降低接地电阻值的措施;土钉墙支护是常用的基坑支护形式,利用土钉作为接地电阻装置,对降低卵石地层条件下低独立接地电阻值具有一定的可研究意义。

The grounding resistance at the access of the through grounding line in the high speed railway subgrade section should not be greater than 1Ω. Considering that the soil resistivity of the pebble formation is high and it is difficult to meet the design requirements under the condition that the independent grounding device is installed, while if the replacement is adopted, the cost is too high and the engineering quantity is large, other measures to effectively reduce the grounding resistance value must be taken. Soil nailing wall support is a commonly used form of foundation pit support, so the use of soil nails as a grounding resistance device has certain research significance for reducing the low independent grounding resistance value under the condition of pebble formation.