采用PCE500实现测斜观测现场记录电子化

测斜仪是岩土工程变形监测中的一种十分有效的观测仪器，由于该仪器观测数据量极大，现场观测记录中对采集数据的处理工作相当繁琐，往往制约着该仪器观测精度和观测资料可靠性的提高。如何采用新的方法减轻现场观测的工作量，确保所采集的观测资料精确可靠，具有相当大的实际意义和价值。文章提出一种已在该工程取得较好效果的电子化记录方法，可供参考借鉴。     

深基坑 测斜监测技术及计算方法改进

研究了目前深基坑围护测斜监测的不足，并通过理论分析和实验研究提出改进的计算方法和测试技术，该方法对深基坑的设计和监测有较大价值。     

三峡永久船闸边坡岩体测斜孔深层形变分析

简要分析了长江三峡永久船闸边坡的钻孔测斜仪监测资料,并选取典型测孔进行了回归分析.分析结果表明,对边坡变形影响最大的因素是开挖因素,边坡锚固及边坡岩体的时效变形、降雨、施工用水及深槽开挖引起的地下水变化、气温变化等因素对变形影响较小.开挖结束后,岩体深层变形逐渐趋于稳定.模型分析还表明永久船闸高边坡变形已经趋于收敛,永久船闸边坡是稳定的.     

大坝沉陷观测电子化记录、整理程序开发与应用

精密水准法观测建筑物沉陷，因其较好的可靠性和适用性，成为目前变形观测中一种常规而难以取代的观测手段，然而沉陷观测存在着较繁琐的内外业数据计算，处理工作，如何提高其观测精度和工作效益，本文叙述了一种已居部分工程中得到一段时间应用并取得良好效果的电子化记录，整理方法，旨在更好地发挥其应用价值。     

深基坑测斜监测技术及计算方法改进

研究了目前深基坑围护测斜监测的不足，并通过理论分析和实验研究提出改进的计算方法和测试技术，该方法对深基坑的设计和监测有较大价值。     

浅议浮筒法测斜技术在大孔径垂直钻孔测斜中的应用

提高大孔径钻孔的测斜精度，是目前专业钻孔队伍面临的重要技术问题之一，能否解决测斜精度问题，往往局限了专业施工队伍投标和工程任务承揽，浮筒法测斜技术的应用解决了大孔径钻孔测斜的技术问题。     

韩城电厂滑坡体测斜孔监测资料分析

本文对韩城电厂东侧横山滑坡体测斜孔监测资料进行了分析与计算，指出该滑坡体为浅层滑和深层滑动组成的多滑动面的滑坡体。得出了经过工程治理，取得了缓解滑动的效果，但没有完全根治，近期滑坡体又有加速蠕动之趋势的结论。     

乌溪江大坝工程测斜监测及其精度控制

滑坡监测是水利水电工程安全监测的一个常见项目 ,为了解滑坡体深层的变形状况 ,常采用测斜仪进行岩土工程的变形监测。那么究竟测斜仪观测成果的精度和可靠性如何 ,文章通过本工程实际应用情况阐述了测斜观测过程中的精度控制及其成果可靠性分析。     

PC—E500野外测量记录程序应用的特点

介绍了PC－E500野外测量记录程序应用的五大特点，综述这些特点为测量所带来的巨大好处。     

简易实用的帷幕灌浆钻孔测斜器

通过反复试验、测试，成功研制出高精度的小偏角帷幕灌浆钻孔测斜器，该文对其组成及原理进行了简要介绍。     

BIAS ERRORS INDUCED BY CONCENTRATION GRADIENT IN SEDI- MENT-LADEN FLOW MEASUREMENT WITH PTV

Sediment-laden flow measurement with Particle Tracking Velocimetry (PTV) introduces a series of finite-sized sampling bins along the vertical of the flow. Instantaneous velocities are collected at each bin and a significantly large sample is established to evaluate mean and root mean square (rms) velocities of the flow. Due to the presence of concentration gradient, the established sample for the solid phase involves more data from the lower part of the sampling bin than from the upper part. The concentration effect causes bias errors in the measured mean and rms velocities when velocity varies across the bin. These bias errors are analytically quantified in this study based on simplified linear velocity and concentration distributions. Typical bulk flow characteristics from sediment-laden flow measurements are used to demonstrate rough estimation of the error magnitude. Results indicate that the mean velocity is underestimated while the rms velocity is overestimated in the ensemble-averaged measurement. The extent of deviation is commensurate with the bin size and the rate of concentration gradient. Procedures are proposed to assist determining an appropriate sampling bin size in certain error limits.     

WELL TESTING ANALYSIS FOR HORIZONTAL WELL WITH CONSIDERATION OF THRESHOLD PRESSURE GRADIENT IN TIGHT GAS RESERVOIRS

A fundamental solution for homogeneous reservoir in infinite space is derived by using the point source function with the consideration of the threshold pressure gradient. The fundamental solution of the continuous point source function is then derived based on the Green function. Various boundary conditions of the reservoirs are considered for this case and the corresponding solutions are obtained through the mirror image reflection and the principle of superimposition. The line source solution is obtained by integration. Subsequently, the horizontal-well bottom hole pressure response function for a non-linear gas flow in the homogeneous gas reservoir is obtained, and the response curve of the dimensionless bottom hole pressure and the derivative for a horizontal well in the homogeneous gas reservoir are obtained. In the end, the sensitivities of the relevant parameters are analyzed. The well test model presented in this paper can be used as the basis of the horizontal well test analysis for tight gas reservoirs.     

ANALYSIS OF PULSATILE FLOW IN THE PARALLEL-PLATE FLOW CHAMBER WITH SPATIAL SHEAR STRESS GRADIENT

The Parallel-Plate Flow Chamber (PPFC), of which the height is far smaller than its own length and width, is one of the main apparatus for the in-vitro study of the mechanical behavior of cultured vascular Endothelical Cells (ECs) exposed to fluid shear stress. The steady flow in different kinds of PPFC has been extensively investigated, whereas, the pulsatile flow in the PPFC has received little attention. In consideration of the characteristics of geometrical size and pulsatile flow in the PPFC, the 3-D pulsatile flow was decomposed into a 2-D pulsatile flow in the vertical plane, and an incompressible plane potential flow in the horizontal plane. A simple method was then proposed to analyze the pulsatile flow in the PPFC with spatial shear stress gradient. On the basis of the method, the pulsatile fluid shear stresses in several reported PPFCs with spatial shear stress gradients were calculated. The results were theoretically meaningful for applying the PPFCs in-vitro, to simulate the pulsatile fluid shear stress environment, to which cultured ECs were exposed.     

NUMERICAL COMPUTATION OF PRESSURE GRADIENT FOR THE FLOW OF POWER-LAW FLUID IN ANNULUS WITH INNER CYLINDER EXECUTING A PLANETARY MOTION

With the governing equations for the flow of the power-law fluid in annulus with the inner cylinder executing a planetary motion being transformed by using the undetermined coefficient method, the formula of pressure gradient for this flow under the given flow rate and the relevant numerical calculation method are given in this article. Through the experiments on the flow of Hydrolyzed Polyacrylamide (HPAM) aqueous solution which can be regarded as a power-law fluid, the calculated results of the pressure gradient values are compared with measured data, the mean relative error between them is smaller than 5%, which verifies the results presented in this article.     

水平液面式孔内电视系统测量孔斜的误差因素

提出水平液面式孔内电视系统测量孔斜的误差因素。并对液体的毛细作用、误差精度、钻孔顶角、容器直径引起的误差进行分析。     

HOT WIRE MEASUREMENT OF TURBULENT BOUNDARY LAYER ON A FILM COOLING PLATE WITH DIFFUSION HOLES

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