摘要
为定量地确定盾构掘进过程中对土体造成的损伤,根据盾构对周围土体的扰动方式和土体内部稳定性判定准则,分析土体在发生损伤过程中,其内部孔隙率的变化规律。基于细观损伤力学理论,分析了土体损伤变量与孔隙率之间的关系,将土体损伤划分为4个不同的阶段,并给出每个阶段的损伤变化规律,建立以孔隙率表征的损伤变量演化方程。并基于线弹性本构关系,建立盾构掘进过程中考虑损伤作用的土体线弹性本构模型,以期为施工提供依据。
To quantitatively determine the damage to soil caused by shield tunneling,according to the disturbance mode of shield to surrounding soil and the criterion of internal stability of soil,the variation law of internal porosity of soil in the process of damage is analyzed.Based on the theory of meso-damage mechanics,the relationship between soil damage variable and porosity is analyzed;the soil damage is divided into four different stages and the damage variation law of each stage is given;and the evolution equation of damage variable characterized by porosity is established.Based on the linear elastic constitutive relationship,a linear elastic constitutive model of soil considering the damage effect in the process of shield tunneling is established,which is expected to provide the basis for the construction.
作者
张朋
陈俊杰
王平凡
吴桐桐
刘磊
ZHANG Peng;CHEN Junjie;WANG Pingfan;WU Tongtong;LIU Lei(China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200240,China)
出处
《建筑施工》
2021年第4期642-645,共4页
Building Construction
关键词
盾构掘进
土体损伤
变量
本构模型
shield tunneling
soil damage
variable
constitutive model
