水泥土帷幕桩联合堆载预压加固对市政道路软土地基的沉降影响分析

Influence Analysis of Reinforcement of Cement-soil Curtain Pile and Preloading on Soft Soil Subgrade Settlement of Municipal Road

随着基础设施建设工程大规模推进,软土问题日益突出。广泛分布的软黏土地基必须经过处理后方能进行道路工程项目建设。为此,通过广州市南沙区某市政道路工程,采用数值模拟的方法,研究了水泥土帷幕桩联合堆载预压对软土地基加固处理的效果,探索了在不同水泥土帷幕桩布置形式、桩长以及布设位置等因素影响下,加固路堤全服役周期的沉降特性。结果表明:1)增设坡脚帷幕桩对路堤的沉降控制能力有一定的提高;2)桩长的设置需依据软土地基含水率沿深度分布规律确定;3)帷幕桩布置在坡脚处对路基沉降影响较小,同时在实际工程中还需考虑坡脚反挖工作量和临近灌溉水的敷设,以综合确定帷幕桩在坡脚的布置位置。以上结论可为类似工程提供参考。

With the large-scale development of infrastructure construction,the problem of soft soil is becoming more and more prominent.The foundation of the widely distributed soft clay must be treated before road construction.In this paper,based on a municipal road project in Nansha District,Guangzhou,the reinforcement effect of cementsoil curtain pile combined with preloading on soft soil subgrade was studied by numerical simulation method;Under the influence of different layout forms,pile lengths and positions of cement-soil curtain pile,the settlement characteristics of reinforced embankment is explored during the whole service cycle.The results show that adding curtain piles at slope toe has some help for control of embankment settlement;Pile length should be determined according to the distribution law of water content of the soft soil subgrade along the depth;The placement of curtain at slope toe has little influence on embankment settlement.In practical engineering,the layout position of the curtain at the slope toe can be determined comprehensively by considering the amount of back-digging at the slope toe and the setting of adjacent irrigation water.The conclusion can provide reference for similar engineering.