考虑膨胀土影响的土钉支护设计方案对比分析——以平顶山市某膨胀土基坑项目工程为例

Comparative Analysis on Design Schemes of Soil Nailing Support Considering the Influence of Expansive Soil——Taking an Expansive Soil Foundation Pit Project in Pingdingshan City as an Example

文章依托平顶山市某膨胀土基坑项目工程,对比分析在坑底浸水60 d情况下,仅考虑膨胀土强度降低和同时考虑强度降低与湿胀力两种支护方式的不同。结果表明:在考虑湿胀力的情况下土钉长度增加明显,钢筋直径也要增大,在进行膨胀土基坑支护设计时,除考虑膨胀土强度的降低,还应同时考虑膨胀土吸水膨胀产生的湿胀力作用,为今后膨胀土基坑支护设计提供参考依据。

Based on an expansive soil foundation pit project in Pingdingshan City, this paper compares and analyzes the difference between two supporting methods of only considering the strength reduction of expansive soil and considering both the strength reduction and wet expansion force when the bottom of the pit is soaked in water for 60 days. The results show that the length of soil nailing increases obviously and the diameter of the steel bar also needs to be increased with the consideration of wet expansion force. In the support design of expansive soil foundation pit, in addition to considering the reduction of expansive soil strength, the effect of wet expansion force caused by water expansion of expansive soil should be considered at the same time, which provides references for the support design of expansive soil foundation pit in the future.