Stability Assessment of the Slopes and Side-Hills with Account of the Excess Pressure in the Pore Liquid
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Національний технічний університет «Дніпровська політехніка», Дніпро
Abstract
ENG: Purpose. The strength criteria substantiation of water-saturated soils and mine rocks, which make it possible to obtain the
analytical solutions necessary for determining the stability of water-flooded soil slopes and side-hills.
Methods. The methods are applied of analysis and generalization of the theoretical and numerical experimental studies
results. The rocks and soils characteristics are taken into account: specific cohesion c, internal friction angle φ, compressive
strength Rc and tensile strength Rp of the rock, as well as the bulk density. The load q was imposed to the water-saturated
seam roof from the overlying mine rock or soil seams, the weight of equipment or structures located on the surface. It was
accepted that the seam is saturated with water (gas) with the excess pressure Р. A point on the mine working surface (or
vertical slope surface), located at a depth z is considered. It is determined at which ratio of q, P and z parameters the soil or
rock seam will be destroyed. The problem solution is based on the Mohr-Coulomb strength criterion.
Findings. The strengths of water-saturated rock and water-free rock are compared. The ratios have been obtained that make
possible to determine the critical load on the daylight surface of water-saturated and water-free vertical slopes, side-hills,
trenches and foundation pits, as well as various mine workings in soil bases and mine rocks. The analytical solution has
been obtained, which makes it possible to determine a value of the critical pressure on the water-flooded vertical surfaces
and soil slopes. The generalization has been made of a certain one-dimensional Mohr-Coulomb strength condition for a
water-saturated base characterized by the strength characteristics с and φ for the dimensional case.
Originality. It has been theoretically proved that for any pore pressure value in the water-saturated mine rock (or soil) their
strength will be less than in their water-free state. New solutions have been formulated for determining the critical height of
a water-saturated vertical soil slope or the wall in the vertical mine working.
Practical implications. The obtained results make it possible to solve the practical engineering problems on determining the
stability of water-saturated slopes and side-hills with a load-free daylight surface, therewith, taking into account the weight of
the equipment, stored material and the stability of vertical walls of water-saturated seams of open-cut mine workings.
Description
V. Andrieiev: ORCID 0000-0002-0862-2790
Keywords
strength criterion, pore liquid, pore gas, pressure, slope stability, water-saturated soil, friction angle, КККГ
Citation
Shapoval V., Shashenko O., Hapieiev S., Khalymendyk O., Andrieiev V. Stability Assessment of the Slopes and Side-Hills with Account of the Excess Pressure in the Pore Liquid. Mining of Mineral Deposits. 2020. № 14 (1). P. 91–99. DOI: 10.33271/mining14.01.091.