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Experimental study of stress-strain relationship of normally consolidated intact soft clay in Hangzhou under undrained fixed shear of principal stress direction and monotonic rotation of principal stress axis had been done, which was used to reflect the soil properties response to the monotonic rotation of principal stress axis under real engineering conditions.

为反映真实工程条件下主应力轴旋转应力路径引起土体性状的变化,对杭州地区正常固结原状软黏土在固结不排水的主应力轴定向剪切和主应力轴单调旋转条件下的应力-应变关系进行试验研究。

By solving a axial-symmetrical boundary value problem consisting of a infinite solid and an isolated spheriodal particle embedded in an infinite matrix, some interesting results are found as follow:(1) at the micron scale, the smaller the particle is, the higher the stresses at the matrix/inclusion interface and within the particle are;(2) this size effect is more remarkable with decreasing the stress triaxiality and increasing the remote equivalent strain.

通过对三轴应力下含椭球夹杂的无限大体边值问题的分析,结果表明:(1)在微米尺度下,夹杂尺寸越小,夹杂/基体界面的法向应力、剪切应力和夹杂内部主拉伸方向的应力越高。

METHODS AND RESULTS: Adherent platelets express substantial amounts of SDF-1 and recruit CD34+ cells in vitro and in vivo. A monoclonal antibody to SDF-1 or to its counterreceptor, CXCR4, inhibits stem cell adhesion on adherent platelets under high arterial shear in vitro and after carotid ligation in mice, as determined by intravital fluorescence microscopy.

方法和结果:在体和离体的粘附血小板表达大量SDF-1、募集CD34+细胞,在体荧光镜下可见,在小鼠颈动脉结扎后、离体条件下的动脉内高剪切应力时,SDF-1或其相应受体的单克隆抗体-CXCR4抑制干细胞粘附于血小板上。

When the joint is brazed at 950℃ for 5min, the resistance of joint is below 5 mΩ and the average resistance is 3.3mΩ, while the joint shear strength reaches 16.34MPa. All of these meet the demand of the joint as a diverter.

在该实验条件下在950℃/15min工艺参数下获得的接头的电阻率低于5mΩ,平均电阻为3.3mΩ,接头的抗剪强度为16.34MPa满足该接头作为换向器接头的使用要求。

For example, a floor joist may be subjected to loads that cause bending moment and shear as well as torsion.in these situations ,measurement of the inherent strength becomes analytically and experimentally complex,and in many situations cannot be done .

例如,地板龙骨可能受到荷载引起的弯矩和剪力以及torsion.in这种情况下,测量的固有实力和实验解析变得复杂,在许多情况下不能做。

Integrate the load transfer principle and shearing displacement method to set up the load transfer equation between the pile of soil, using the discrete and fitting methods to solve the equation so as to educe the pile displacement of arbitrary section as well as the analytical solution. Comparing the results with the soil settlement solved by the Mair equation, the relative displacement can be gained.

1结合荷载传递原理和剪切位移法的思想建立隧道开挖作用下的桩土荷载传递方程,采用离散和拟合两种方法来对该一元二次非齐次微分方程进行求解,可分别得到桩身任意截面处的桩体位移以及桩身位移的解析解,并与基于Mair公式求得的地面下任意深度处的土体沉降进行比较,即可求出桩与桩侧土之间的相对位移。

We have undertaken an experinental study of compressional-wave velocity and It's anisotropy of mylonite and it's surrounding rocks from North-China at high pressure and temperature.

对华北地区韧性剪切带几种代表上、中、下地壳深度的糜棱岩及其围岩在高温高压条件下进行纵波速度测定及各向异性研究。

By field-testing methods, such as static cone penetration test, field vane shear test, and pore water piezometer test, the variation of strength and the pore water pressure are measured at real time, and the marine hydrodynamics' impaction on the consolidation process of the sediments in the Yellow River Estuary was studied. It is shown that the self-consolidated sediments have a very fast consolidation rate, under self-consolidation, in 72h, the consolidation degree reaches 37% and about 142h the pore water pressure disperse over, while under the hydrodynamics, in 72h the consolidation degree reaches 52% and about 195h the pore water pressure disperse over.

在黄河三角洲刁口叶瓣潮坪上,开挖2m×1m×1m的试坑,现场取土配置黄河口快速沉积形成的流体状堆积物,以铁板部分覆盖试坑隔绝波浪和潮流作用,利用微型贯入、静力触探、十字板剪切试验、孔隙水压力监测等原位测试手段,实时测定快速沉积的海床土强度发展以及孔隙水压力消散情况,研究快速沉积的粉质海床土分别在自重条件下以及在波浪和潮波等水动力作用下的固结过程。

The main achievements could be summarized as follows.1. The basic stress-strain characteristics and related physical mechanisms for sands under cyclic rotation of principal stress axes were investigated based on three kinds of drained tests including fixed principal stress axes, cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant, and cyclic changes of principal stresses in both their axes and magnitudes. The main deformation behavior of sands with inherent anisotropy under cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant was obtained in the following.

本文从试验研究、规律分析、数学建模和工程应用四个方面,对应力主轴循环旋转条件下砂土的变形特性进行了较为深入的研究,取得了如下主要研究成果:(1)基于对饱和砂土进行的主轴固定单调剪切、纯应力主轴循环旋转以及主应力幅值与应力主轴耦合循环变化的三类完全排水试验成果,分析和揭示了应力主轴循环旋转条件下砂土的基本变形规律,并探讨了其受力变形的内在机理。

In fact, when the press print Screen key, the current image is saved to the system clipboard, just open the "Paint" program, press "Ctrl + V" key combination to paste over the.

其实,当按下print Screen键后,当前的图像被保存到了系统的剪切板中,只要打开"画图"程序,按下"Ctrl+V"组合键即可粘贴过来了。

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