Assessment of lateral earth pressure coefficient and Poisson’s ratio in artificially damaged enclosing rock mass of the Noyon-Tologoy deposit

Efficient analysis of the rock mass behavior during construction of high dams and dumps depends on the reliable estimates of their mechanical properties. This research goal is to determine relative transverse strain of damaged rocks in the conditions as close to the full-scale conditions as possible. The difficulty of the lab-scale tests in this case is connected with the incommensurability between sizes of lumps of rocks and test cells, as well as with the influence of the size effect. With this end in view, a large test bench with power frames was used to record the reaction forces transmitted by hydraulic jacks to damaged rocks filled in the test cell. The necessary equipment—press tools, shear rings, trolleys, plates, etc.—was manufactured for the tests. The relative transverse strain was assessed using the novel original equipment and methods protected by an invention patent. Thus, the most important mechanical properties of damaged rocks were obtained and used for high dam design at tailing ponds. The test results provide information on the influence of fractional composition of rocks on lateral earth pressure coefficient and Poisson’s ratio at the same vertical pressure. The traditional-way setting of a constant Poisson’s ratio in the geomechanical calculations for rock masses of different granulometric composition requires an appropriate correction.

Babello V. A., Beydin A. V. Assessment of lateral earth pressure coefficient and Poisson’s ratio in artificially damaged enclosing rock mass of the Noyon-Tologoy deposit. MIAB. Mining Inf. Anal. Bull. 2021;(3-2):5-17. [In Russ]. DOI: 10.25018/0236_1493_2021_32_0_5.

Babello V. A.¹, Dr. Sci. (Eng.), Professor;
Beydin A. V.¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: beydin@mail.ru;
¹ Transbaikal State University, Chita, Russia.

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