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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 the settlement of the silty soil splicing subgrade, the finite element model was established by treating the gravel pile composite foundation. The influence of the length and modulus of the stone pile, the soil modulus between the piles and the cohesion on the settlement was studied. The results show that when the pile length is 5.0m, the maximum subsidence of the subgrade top surface is 9.8cm. The effect of the gravel pile modulus on the subsidence is insignificant. The inter-pile soil modulus has a great influence on the subgrade settlement. Subsequent to the increase of 14 MPa, the subgrade settlement tends to be stable. At this time, the top subgrade settlement is 7.15 cm. When subgrade cohesion reaches 10 kPa, the subgrade settlement tends to be stable. At this time, the top subgrade settlement is 9.8 cm. In short, the gravel pile can significantly reduce the settlement, the gravel pile length 5.0m, the soil between the pile module 14MPa, inter-pile soil cohesion 10kPa, the new subgrade settlement control effect is good.