摘要
为减小粉砂土拼接路基的沉降,采用碎石桩复合地基处治,建立了有限元模型,研究了碎石桩长度及其模量、桩间土模量及黏聚力对沉降的影响。结果表明:桩长为5.0m时,路基顶面最大沉降为9.8cm;碎石桩模量对沉降的影响不显著;桩间土模量对路基沉降的影响较大,当桩间土的模量增大到14 MPa以后,路基的沉降趋于稳定,此时路基顶面沉降为7.15cm;桩间土黏聚力达10kPa后路基沉降趋于稳定,此时路基顶面沉降为9.8cm。总之,碎石桩能明显减少沉降,碎石桩长5.0m、桩间土模量14 MPa、桩间土黏聚力10kPa时,新路基沉降控制效果良好。
In order to reduce settlement between splicing subgrade and old subgrade,the treatment method of gravel pile composite foundation is employed.Based on the finite element model,in view of the length and modulus of gravel pile,modulus and cohesive force of soil between piles,settlements are calculated,through which the influences factors and effects are analysed.The results show that the maximum settlement is 9.8 cm.The modulus of gravel pile has little influence on settlement of subgrade.However,the modulus of silty soil between piles has a large impact on settlement of subgrade.After the modulus of the soil between piles reaches 14 MPa,the settlement tends to be stable when the settlement of subgrade surface is 7.15 cm.Then,the subgrade settlement becomes stabilized when the cohesive force reaches 10 kPa,with a subgrade surface settlement of 9.8 cm.In a word,the gravel pile can significantly reduce the settlement.To achieve the ideal effect,the length of gravel pile is 5.0 m with the modulus of 14 MPa and cohesive force of 10 kPa of silty soil between piles.
出处
《公路》
北大核心
2017年第10期57-61,共5页
Highway
基金
河南省科技发展计划项目
项目编号162102210026
河南大学科研基金项目
项目编号2016S12
开封市科技发展计划项目
项目编号1602014
关键词
道路工程
粉砂土
拼接路基
碎石桩
沉降控制
数值模拟
road engineering
silty soil
splicing subgrade
gravel pile
settlement control
numericalsimulation
