Methods of in situ strength testing of rocks and joints

The article offers in situ test methods for cohesion and internal friction angle in rocks and at joints. Technologies and instrumentation for shearing of rock wedges in an open pit mine and for laser scanning and digital imaging of local falls and breaks of inaccessible rock blocks in pitwalls have been developed and approved for constructing a limit equilibrium equation and for calculation of strength properties of rocks and joints. Rock wedges for the tests are prepared using various design drill rigs, the rock wedges are sheared using a 40-t jack placed in a special metal housing with an electric hydraulic pump. Exploration of inaccessible local falls in pitwalls uses electronic tachometers and 3D mine scanner. The tests and approval of the described exploration techniques have been carried out in open pits in Kazakhstan and Kirgizia.     

Reducing the iron content in water used in dry-slaking steam boilers

The efficiency of electrocoagulation in removing iron compounds from water is studied.     

Thermal Analysis of Oxidation of TiB2 Powders for Wettable Composite Protective Coatings for Aluminum Electrolyzer Cathodes

Protection of Metals and Physical Chemistry of Surfaces - The resistance of different TiB2 powders to oxidative degradation is studied by synchronous thermal analysis. The temperature dependence of...     

Effect of phenol formaldehyde resin on the carbothermal synthesis of TiB<Subscript>2</Subscript>

The effect of phenol formaldehyde resin (PFR) on the preparation of TiB₂ powders by carbothermal synthesis at temperatures (T) of up to 1670 K has been studied by simultaneous thermal analysis. Unlike in the case of dynamic heating, under isothermal conditions (1570 K, 3 h) the addition of PFR increases the product yield by 13%. The formation of carbon black as a result of PFR thermolysis is favorable for the formation of titanium carbide, from which TiB₂ is synthesized.     

Selection and Justification of Design Variables for Strength Properties of Rocks in Slope Stability Analysis for Open Pits

Journal of Mining Science - The presented procedure of slope stability analysis for open pits is based on the comprehensive studies into physical/mechanical properties and structural tectonics of...     

Evaluation of the quality of laminated metallic materials on the basis of high-frequency endurance and damping capacity

Experiments were carried out to examine the edurance and damping capacity of three types of laminated metallic materials based on V95 alloy produced by explosion welding, and the materials from which these laminated materials were produced were also examined. Special features of fatigue failure of laminated materials, especially branching of a fatigue crack on arrival at the boundary of the layers, are described. A method is proposed to evaluate the qualitative materials on the basis of the set of the properties of endurance and oscillation damping which makes it possible to take into account efficiently the preference system of the expert or person which takes decisions, in a wide spectrum of possible situations.Volgograd Polytechnical Institute. Kuibyshev Aviation Institute. Translated from Problemy Prochnosti, No. 12, pp. 36–40, December, 1989.     

Thermal conditions in a laser in a low-density gas

Thermal conditions are examined for a solid-state laser having natural cooling and working at atmospheric pressure or in a low-density gas. Measurements and calculations are reported on the nonstationary temperature distributions.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 5, pp. 842–847, November, 1988.