It analyses the influence of , dilatancy , rotation of soil cell ' s principal stress , pore water pressure and the damage softening . the author puts forward a critical value of 0 . 01d - 0 . 02d to judge the pile - soil slippage 分析了c 、的异步发挥，土的剪胀性，土单元主应力方向旋转，孔隙水压力以及损伤软化对侧阻发挥的影响。
These three aspects of anisotropic index can be sufficiently embodied in the property of compliment matrix of anisotropic elasticity and compliment marix of principal stress and principal strain relation with general sense 这三方面的各向异性指标可以在各向异性增量弹性和更具一般意义的增量主应力主应变关系的柔度矩阵性质中得到充分体现。
Former true triaxial test research have been lack of the completely study on soil anisotropic deformation characteristic on condition that load in each of the tree principal stress direction because of their different research purpose 由于研究目的不同，以往真三轴试验研究中缺乏针对三主应力单向加荷时的土体各向异性变形特性较全面的研究。
The research of soil anisotropic deformation characteristic in this paper is mainly to study the anisotropy of lateral deformation and the anisotropy of principal stress and principal strain relationship in different load direction 本文土体各向异性变形性状的研究主要为了研究侧向变形以及不同主应力加荷向的主应力主应变关系的不同变化规律。
The numerical results show the validity of the model and the effect caused by the yield surface and the rotation of principal stress axes on soil deformation . lastly , the relative results are got by the comparison and analysis 同时，依据两个算例，分别研究了主轴旋转和选用不同本构模型(双屈服面模型、三屈服面模型)对土体位移和应力的影响，得到了相应的结论。
Taking protective measures can obviously reduce the face slab ' s surface temperature drop - out range and the maximum principal stress amplification caused by temperature sudden drop , and the stronger protective measures are , the more obvious reduced effect is 采取保护措施，可以明显削减气温骤降所产生的面板降温幅度及最大主应力增幅，保护措施越强其削减效果越明显。
This kind of structures will cause the principal stress difference bigger due to the sharp changes modulus of deformation between auxiliary core and main core , auxiliary core and upstream and downstream transition materials , which is disadvantage of stress transmission 该种心墙的结构型式，由于副墙与主墙、副墙与上下游侧过渡料的变形模量发生突变，不利于应力的传递，造成主应力差值偏大。
The innovation of multiple mechanism boundary surface plasticity model is that the effect of rotation of principal stress axial directions and large shear displacement of sand in the earthquake induced liquefaction are taken into account at the same time in the model 独到之处在于所建立的多机构边界面塑性模型能够同时考虑土体在复杂荷载作用下主应力轴旋转的影响和砂土地震液化时剪切大位移特性。
When the effect of intermediate principal stress was considered in different degrees , the dimensions and shapes of surrounding rock mass is rather different , and this phenomenon will be more obvious with the increase of the difference of horizontal stress and vertical stress 当不同程度地考虑中间主应力的影响时，围岩塑性区形状和大小有较大不同，且随水平应力与垂直应力差异性的增大，这种影响趋于明显。
Many computational analysis of soil constitutive models appear to be irrational because of taking no account of or not thoughtfully considering the anisotropic deformation when they face the direct or indirect simulation of principal stress and principal strain relationship of load bearing unit 诸多土体本构模型都会直接或间接面临对受荷单元主应力主应变关系的模拟，但由于不考虑或考虑各向异性变形特性不周，对各向异性变形问题的计算分析就会出现不合理。
