预应力混凝土管桩加固软土地基效果及参数影响分析

Effect of Soft Soil Foundation Reinforced by Prestressed Concrete Pipe Piles and Impact Analysis of Parameters

采用数值模拟的方法分析了预应力混凝土管桩加固软土路基的效果,并对相关参数影响进行了分析,得到以下结论:分层填筑过程中数值模拟值与现场监测数据误差均在10%以内,说明数值模拟结果的可靠性;加固前路基沉降比较集中,路基水平位移较大值集中在路基坡脚处;加固后地基沉降大幅度降低,路堤坡脚水平位移明显减小,保证了路堤的安全;增大桩长和减小桩间距均可以有效降低路基沉降,但这种方法降低的沉降是有限的,设计和施工过程中要根据地质和工程条件合理设计参数;通过设置桩帽,使得桩体承载能力增大,降低了桩间土分担荷载,增加了桩体承载能力,减小了路基沉降。

The effect of soft soil subgrade reinforced by prestressed concrete pipe piles is analyzed by using the numerical simulation method,and the impact on relevant parameters is analyzed.The following conclusions are obtained:the error between numerical simulation value and on-site monitoring data during layered filling is within 10%,indicating the reliability of numerical simulation result;before the reinforcement,the settlement of subgrade is relatively concentrated,and the large value of horizontal displacement of subgrade is concentrated at the foot of subgrade slope;after the reinforcement,the settlement of the foundation is greatly reduced,and the horizontal displacement of the embankment slope toe is significantly reduced,ensuring the safety of the embankment;increasing the pile length and reducing the pile spacing can effectively reduce the subgrade settlement,but the settlement reduced by this method is limited.During the design and construction process,the parameters should be reasonably designed according to the geological and engineering conditions;the bearing capacity of piles is increased,the load shared by soil between piles is reduced,the bearing capacity of piles is increased,and the settlement of subgrade is reduced by setting up pile caps.