深基坑支护设计中多层土物理力学参数分算与合算的研究

Analysis of Physical & Mechanical Parameters Determined by Layering Calculation or Average Calculation for Deep Pit Bracing in Multi-layer Subgrade

以广州市五山路下沉式公路隧道的深基坑支护为例,应用等值梁方法对土层参数分层计算与加权平均计算所得到的桩的插入深度、支点力、最大弯矩等的结果均相差较大,对设计有较大的影响。从计算与实测结果可以看出,分层计算的结果比较合理,对类似的工程设计与施工均有指导意义,具有一定的实用价值。

Taking a deep pit bracing of Wushan road tunnel in Guangzhou as an example, layering calculation and weighted average calculation are adopted for equivalent beam method. The embedded length of pile, the supporting point, the maximum moment etc. are obtained using both equivalent and weighted mean methods but the resulfs from the two methods are highly different, which makes a great effect on the design. Comparison of the results from calculation and in field measurement show that it is more reasonable to use layering calculation. It is applicble and may be a helpful guide for similar works.