New approximation for a magnetic field of a dipole on a borehole axis

New, more exact approximated solution to the direct problem of identifying a signal of a vertically oriented magnetic dipole on a borehole axis is reported. This solution makes possible to process the data of the high-frequency induction logging isoparametric sounding, including negative values of the measured phase difference. The new approximation enables taking into account the variable borehole radius that is of special importance when a highly-conductive drilling mud is used. As the obtained expression is explicit, it can be used for the quick data processing and for solving inverse problems of the borehole geophysics. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 3–9, July–August, 2006.     

Three-dimensional modeling of a deposit in a database

Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 77–85, July–August, 1991.     

Deformation of a blocky medium around a working

Conclusions The deformation of the blocky mass around a working can be interpreted as displacement of the material in a convergent radial channel with an aperture angle of 360°. A kinematic scheme permitting the formulation of the problem in statically determined form (similar to the classical scheme for calculation of the pressure of the earth at a supporting wall) is constructed. Axisymmetric solutions for different levels of block interaction on contact are given. Estimates of the carrying capacity are obtained in the case of rigid-plastic contact between the block and in conditions of dry friction. It is shown that this scheme admits of transition in the limit to the accurate solution of the Lame problem in the continuum formulation. Cases in which increase in the relative slip between the blocks leads to decrease in the interaction force between them (weakening) are considered. With slight weakening, the deformation is a stable process. If the weakening is greater than a critical level, the solution becomes unstable, which indicates the uncontrollable release of stored elastic energy from the mass. Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 7–15, November–December, 1990.     

某厂房吊车梁结构性能检测

对某厂房预制钢筋混凝土吊车梁进行了正常使用极限状态的性能检测，并详细介绍了试验的实现方法以及对有关检测规范的具体运用。     

用神经网络确定梁上裂纹位置的研究

以间隙单元模拟裂纹,用有限单元法对带有裂纹的简支梁进行分析,计算了具有不同位置裂纹的梁在冲击荷载下的时间历程响应.建立了人工神经网络模型,它的输出层单元用于裂纹端点的定位,输入数据为梁上结点的振动位移.该网络用位移响应和裂纹始端坐标的数据进行训练,数据的正向计算和误差的反向传播交替进行,直至网络的误差收敛到一个极小的水平.在输入梁的振动位移响应数据时,训练好的神经网络通过回想可以给出裂纹位置的坐标.     

Elastic waves in a medium with a block structure

Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 14–21, January–February, 1988.     

Analysis of a borehole driving by a pneumatic puncher

Results are presented for experimental investigation of borehole formation in soils by a pneumatic puncher which make it possible to increase borehole diameters and movement rates. The possiblity is established of determining the energy content for driving according to dynamic densimeter readings. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 95–100, May–June, 2000.