就地固化土层联合桩复合地基桩土应力比分析

doi:10.13722/j.cnki.jrme.2022.1132

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摘要研究了就地固化土层联合桩基复合地基在路堤荷载作用下的桩土应力比计算方法。考虑桩–土相对位移对桩侧摩阻力的影响，采用固化层为定值、软土层为线性变化的桩侧摩阻力分布模型；基于荷载传递法，对桩、桩间土体微单元进行受力分析，结合固化层–桩–土的变形协调方程，推导固化土层联合桩复合地基桩土应力比的解析表达式；分析有无固化层、固化土层模量及厚度等因素对桩土应力比的影响。结果表明：选择合适的固化剂掺量，在深厚软土地基上设置一定厚度的固化层能够降低桩土应力比，有效发挥桩间土体的承载能力，有效提高复合地基的承载能力。固化土层模量超过50 MPa后，桩土应力比增幅不明显，在选择固化剂掺量时应适量；桩土应力比随着固化土层厚度增加而增大，但从工程经济节约的角度出发，厚度的选择也要适当。

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	陈龙1
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	柴浙炜1
	沈政3
	陈永辉1
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	谢晨雷1
	李德晟1

关键词 ：道路工程, 固化土层联合桩复合地基, 水泥搅拌桩, 桩侧摩阻力, 桩土应力比

Abstract：The pile-soil stress ratio of the composite foundation reinforced by piles and solidification layer under embankment load was studied. The friction resistance of pile was supposed to be constant in the solidification layer and linearly increased with depth in the soft layer，considering the impacted of the relative displacement of pile and soil. Based on the load-transfer method，the force on the discretization of the soil and piles were analyzed. The analytical expression of the pile-soil stress ratio of the composite foundations was derived，taking the compatibility equation of deformation into consideration. The influence factors of the pile-soil stress ratio such as the solidification layer，the modulus and thickness influence were studied. The result show that set solidification layer on deep soft soil foundation using the suitable dosage of curing agent can decrease the pile-soil stress ratio，increase the bearing capacity of soil between piles and the composite foundation. The increase amplitude is not obvious while the elasticity modulus of the solidification layer larger than 50 MPa，so the dosage of curing agent should be in the suitable range. The pile-soil stress ratio increase with the increasing thickness of the solidification layer，but the choose of the thickness should in the right range from a economy perspective.

Key words： road engineering composite foundation reinforced by piles and solidification layer cement mixing pile pile friction resistance pile-soil stress ratio

引用本文:

陈龙1，2，柴浙炜1，沈政3，陈永辉1，4，谢晨雷1，李德晟1. 就地固化土层联合桩复合地基桩土应力比分析[J]. 岩石力学与工程学报, 2023, 42(10): 2578-2587.
CHEN Long1，2，CHAI Zhewei1，SHEN Zheng3，CHEN Yonghui1，4，XIE Chenlei1，LI Desheng1. Study on the pile-soil stress ratio of the composite foundations reinforced#br# by piles and solidification layer. , 2023, 42(10): 2578-2587.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1132 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2578

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