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The influential soil constitutive models involving principal stress axes rotation, such as Matsuoka's model, kinematic hardening model, bounding surface model and the complete stress incremen...

对当前较有影响的含主应力轴旋转的土体本构模型(基于一般应力空间的土体本构模型、运动硬化模型、边界面模型、土体弹塑性应力应变关系的完全应力增量表述等等)进行了较为系统的评述。

The results show that soil-root complex still comply with Coulomb's law; root-soil complex cohesion and the incremen in the unit soil content directly proportional relationship, and the root system anchoring role formula is established based on this; Different distribution methods in root has different impact on the shear strength of composite material.

最后,通过有限元分析表明,草根的作用,能够降低浅层土体中的应力水平,即草根能改变浅层土体的应力应变状态;草根增加了浅层土体的粘聚力,对边坡的稳定是有利的。

In this paper, model experiment research was carried, of which was based upon the forced settlement and rectification measure of some buildings on self-weight collapse loess area. At the same time, some conclusions are drawn: 1 the relationship between the soil stress deliquesce and quantity of slope, quantity of settlement of buildings and stress variety of soil body; 2 the relationship between the superimposed stress and quantity of slope, quantity of settlement of buildings and stress variety of soil body; 3 the relationship between quantity of slope, quantity of settlement of buildings and water injection quantity in hole; 4 the relationship between quantity of slope, quantity of settlement of buildings and diameter and interval of hole; 5 the relationship between stress variety of soil body and water injection quantity in hole and interval of hole.

本论文针对地处自重湿陷性黄土地区的建筑物和构筑物的迫降纠倾进行了模型试验研究,给出了自重湿陷性黄土地区建筑物迫降纠倾时1地基应力解除、附加应力与建筑物倾斜量、沉降量及土体应力变化的关系;2附加应力与建筑物倾斜量、沉降量及土体应力变化的关系;3建筑物倾斜量、沉降量与孔内注水量的关系;4建筑物倾斜量、沉降量与孔径和孔间距的关系;5土体应力变化与孔内注水量、孔直径的关系。

Sedimentation anyslys of soil under the action of deadweight; 2 Sedimentation anyslys of structure in using; 3 Endogen force anyslys of structure in using; 4 Soil remolding type anyslys; 5 Homogenous flush works anyslys; 6 Anyslys of the structure sedimentation effects of different flushing amount at the same place; 7 Anyslys of the structure sedimentation effects of different flushing places; 8 Anyslys of the structure sedimentation effects of different horizontal flushing places; 9 Anyslys of the structure sedimentation effects of different vertical flushing places; Getting the different between the endogen force of common structure and that of slant structure.

对掏土纠偏过程做了以下9个方面的分析:1、土体在自重作用下的沉降分析; 2、建筑物在使用阶段的沉降分析; 3、建筑物在使用阶段的内力分析; 4、土体受扰动类型分析; 5、均匀冲水施工过程分析; 6、同一个地方冲水量大小不同对建筑物沉降影响分析; 7、不同沉井冲水对建筑物沉降影响分析; 8、进深不同的土层冲水对建筑物沉降影响分析; 9、不同埋深土体冲水对建筑物沉降影响分析。

On the basis of these, the author analyze stress-strain model of rock and soil which is under the groundwater effect, the continuity equation of groundwater when the rock and soil is deformed, and the relation between permeability coefficient tensor of rock and soil and stress field, and brings up the mathematical model of stress-seepage coupling fields.

在此基础上,论文阐明了考虑地下水作用的岩土体本构模型、考虑岩土体变形的地下水流动连续方程和岩土体渗透系数张量与应力场的关系,提出了新的应力-渗流耦合场数学模型。

During treatment of soft soil subgrade located in large regional fault zone, model of floating bridge above water is adopted. Based on characteristics of subgrade soil with large porosity and loose, consolidation grouting method is used to raise load capacity of subgrade which can combine underground reinforced concrete raft foundation with steel pipe friction micropile to improve integrity strength of special heavy traffic soil subgrade.

摘要] 阐述在区域性大型断层带的软基处理中运用"水上浮桥"的建模思维方式,根据路基岩土体孔隙率大、松散的特点,采用固结灌浆从挖掘岩土体本身的潜力提高地基承载力,固结灌浆岩土体使准连续配筋混凝土地下筏板基础与摩擦型钢管微桩有机结合,以此提高运煤特重交通路基的整体强度。

In this paper the conflicting discussion of scholastic view-point on seepage force which has lasted many years is stated. Then the physical concept of seepage force and its related forces including the resolved two components (a seepage force and a buoyant force) from seepage resultant force, the transformation between the seepage force and boundary pore water pressures, schematic diagram of forces acting on unit soil mass and the mathematic proof by Green theorem are described.

追述了多年来对渗透力学术观点的争论,并再就此问题论述了渗透力的物理概念及其与之相关的各力(包括渗流作用合力及其分解成的两个分力,渗透力与周边孔隙水压力的转换关系及各力作用在单位土体的图示;从数学上引用格林公式,证明土体表面水压力与土体本身渗透力之间的转换关系。

The results of numerical analysis show that the elastic modular and the poisson ratio have no effect on two-dimensional bearing capacity, but can affect the ultimate bearing capacity of three-dimensional foundations and control the convergence and precision of finite element calculation; the earth pressure coefficient controls the geostatic stress of foundation, sequentially affects the ultimate bearing capacity of foundations and the convergence of numerical calculation. When calculating the ultimate bearing capacity of undrained saturated foundation, the complete formulation exists shear locking, and reduce formulation exists hourglassing, so the hybrid formulation is suitable to imitate the geomaterial. When the soil obeys nonrelevent flow rule, the yielding function is different from potential function, and the elastic-plastic matrix of soil is asymmetric, so the unsymmetry numerical solver and appropriate finite element mesh is required.

研究结果表明,土体弹性模量和泊松比对二维基础极限承载力没有影响,但是影响着三维矩形基础的极限承载力,控制着ABAQUS数值算法的计算精度与收敛速度;地基土压力系数控制着地基土体中的地应力平衡,从而影响着二维条形基础和三维矩形基础的极限承载力和地基破坏包络面;对于不排水饱和软黏土地基,常规的完全积分单元会造成剪力自锁现象,而减缩积分单元则存在过于柔化的现象,故采用杂交单元来模拟较合适;当土体服从非关联流动法则时,屈服函数与塑性势函数之间存在差异,从而导致土体弹塑性矩阵呈现非对称性,在有限元计算中必须采用非对称数值解法,并且合理地划分单元才能对极限承载力进行准确求解。

Total N increased significantly in the rhizosphere, hut total P and total K decreased. However, the available N, P and K in the rhizosphere behaved in an opposite way: with available N decreased but available P and available K increased in the rhizosphere except fur Phragmites communis Trin. Deficit of available N is the most significant, and accumulation of available P and available K were the least for Salsola nitraria Pall. among all seven halophytes.

在所有研究植物中,根际土壤中全N含量比土体的含量高,但全P和全K含量却比土体的含量低;根际土壤中有效态养分的变化则与全态相反,根际土壤中的有效N含量比土体中的都显著降低,除芦苇外,其他六种盐生植物根际土壤中有效P和有效K的含量都高于土体,但有效P的富集不及有效K富集的程度高。

It has become the historical task of dynamics of rock and soil mass to study the relationship between synthetic physical properties and dynamic response of rock and soil mass, consummate the theory and methodology of dynamics of rock and soil mass, and accelerate the formation of subject system of dynamics of rock and soil mass crossed and osmosed by many other relative sciences so as to meet the demand of sustainable development of mankind society.

进行工程岩土体的综合物性与动力反应的系统研究,完善工程岩土体动力学的理论和方法,促进多学科交叉渗透的岩土体动力学学科体系的形成,以适应人类社会可持续发展的需要,已成为岩土体动力学研究的历史任务。

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