不平衡高差场地条件下软土基坑对撑支护设计分析

为了研究不平衡高差场地下软土基坑对撑支护方案，以珠海地区典型软土基坑为研究

背景，利用Midas GTS NX有限元数值分析软件，针对3种支护方案进行数值模拟分析，得出了适合不

平衡高差场的支护设计要点。研究表明：高差较大的软土基坑两侧土压力不平衡，对撑支护条件下

深侧基坑向坑内位移较大，并可以引起浅侧基坑向坑外位移；坑内加固+桩外主动土加固的支护形式

对基坑变形有明显抑制作用，若配合浅侧先挖的施工措施，对进一步控制基坑变形更有利；采用有限

元数值分析软件进行不同支护方案的决策选型具有可行性。

In order to study the supporting scheme of soft soil foundation pit under unbalanced height

difference field，taking the typical soft soil foundation pit in Zhuhai area as the research background，Midas

GTS NX finite element numerical analysis software is used to simulate and analyze the three supporting

schemes，and the supporting design points suitable for unbalanced height difference field are obtained.The

research shows that the earth pressure on both sides of the soft soil foundation pit with large height difference

is unbalanced，and the displacement of the deep side foundation pit to the pit is larger under the condition of

bracing support，and the displacement of the shallow side foundation pit to the outside of the pit can be

caused.The support form of reinforcement in the pit + active soil reinforcement outside the pile has a signifi⁃

cant inhibitory effect on the deformation of the foundation pit. If it is combined with the construction mea⁃

sures of the shallow side excavation first，it is more favorable to further control the deformation of the founda⁃

tion pit.It is feasible to use finite element numerical analysis software to make decision and selection of dif⁃

ferent support schemes.

1. Wuhan Geological Prospecting Foundation Engineering Co.，Ltd.;

2. Hubei Institute of Urban Geological Engineering

摘要：

为了研究不平衡高差场地下软土基坑对撑支护方案，以珠海地区典型软土基坑为研究

背景，利用Midas GTS NX有限元数值分析软件，针对3种支护方案进行数值模拟分析，得出了适合不

平衡高差场的支护设计要点。研究表明：高差较大的软土基坑两侧土压力不平衡，对撑支护条件下

深侧基坑向坑内位移较大，并可以引起浅侧基坑向坑外位移；坑内加固+桩外主动土加固的支护形式

对基坑变形有明显抑制作用，若配合浅侧先挖的施工措施，对进一步控制基坑变形更有利；采用有限

元数值分析软件进行不同支护方案的决策选型具有可行性。

关键词:

不平衡高差软土基坑桩撑支护数值模拟

Abstract: