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.     

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.     

Productivity of a well linked with a reservoir by two in-line holes of a small diameter

A promising alternative to hydraulic fracturing is proposed for enhancing oil recovery in a reservoir with satisfactory vertical permeability by way of creating hydraulic communication between a well and the reservoir via two in-line holes of a small diameter. An approximated calculation of stationary productivity of this system is presented. An analysis of this system efficiency is performed by comparing its conductivity and productivity coefficients with the same coefficients of a created fracture having the length and opening equatable with the length and diameter of the hole. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 20–28, September–October, 2006.     

Assessment of Phosphate Limestone Wastes as a Component of a Store-and-Release Cover in a Semiarid Climate

In a semiarid climate where the annual precipitation is low and the evaporation rate is high, contaminated drainage production from mine tailings can be controlled by reducing water infiltration. Store-and-release covers that use capillary barrier effects can prevent water percolation by storage and evaporation (or evapotranspiration) during wet and dry climatic periods. In Morocco, sedimentary phosphate mines are located close to contaminated sites, which includes the abandoned Kettara mine. This mine site generates highly contaminated acid rock drainage (ARD) with negative impacts on its surrounding area. In order to validate if phosphate mine wastes can be used as cover material to reclaim the Kettara site, instrumented test columns were exposed to field conditions and tested for a period of one and a half years. Under natural conditions, more than 94 % of the total net infiltration (246.5 mm) was released to the atmosphere by evaporation. Preliminary tests showed that the studied scenarios can limit deep water infiltration even during extreme simulated rainfall (155 mm/d) and could be used to efficiently control contaminated drainage in a semiarid climate.     

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。     

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.     

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。