Geomechanical estimate of the rock mass state in the course of deep level mining in terms of the Tishinsk deposit

Based on the in situ measurements and analytical studies, the forecast of the stress-strain state is implemented for the Tishinsk orebody in the course of extraction at deep levels, as well as the state of rocks in the area of access shafts driven in walls of the Tishinsk Open Pit is estimated.     

Determination of the stress-strain state and damages in a rock mass by the displacement measurements on its surface. Part I: Analytical solutions

The article offers two approaches to stress-strain state problem solution: the first is the analytical solution for the elastic deformation of a medium, the second is the numerical solution for the elastic and inelastic deformation. The analytical solution is based on the Kolosov-Muskhelishvili formulas, the numerical solution is analogous to the Euler solution of a regular first-order differential equation. The both methods are compared, and calculation of breaches in half-plane is exemplified.     

Estimating remaining life of underground tunnel concrete lining by convergence measurements

The authors propose a procedure for estimating stresses, load bearing capacity and remaining life of lining in long-term operated underground tunnels using the analytical calculations based on solving the plane elastic problem on stress-strain state of a non-circular variable-thickness ring restraining a hole in a linearly deformed medium, and by the in situ measurement data.     

Effect of partial water flooding on the stress-strain state of the crown pillar in the Aikhal Mine

Based on numerical modeling of stress-strain state of rocks and the in situ deformation monitoring of rocks mass surrounding underground excavations, the authors determine stability criteria for mine structural elements in terms of the Aikhal Mine where mining has been transferred under the worked-out open pit bottom. Using the determined criteria, the stress-strain state and subsidence of the crown pillar are assessed, considering current stage of the water table in the open pit. The article gives predictive estimate of the change in the stress-strain state and subsidence of the crown pillar upon the water level raising.     

Stress-strain state of enclosing rock mass around an arbitrary cross-section excavation by measurement of displacements of the excavation walls

The stress-strain state in rocks around an excavation is assessed by the values of stresses “at infinity”, i.e., it is required to know stress distribution in an intact rock mass. The authors propose a new method of the stress-strain state assessment for an arbitrary cross-section excavation based on direct measurement of displacements of the excavation walls, using the Kolosov-Muskhelishvili formulas. Under analysis are the excavations shaped as circular and elliptical cylinders.     

Temperature Stresses in the Vicinity of Extended Mine Workings

The problems on the stress-strain state of a rock mass subjected to the heat effect are solved by means of singular integral boundary equations.     

On Method to Take into Account the Rheological Properties of Rocks in Finite-Element Analysis of Geomechanical Processes

A numerical procedure is proposed to calculate the change in the stress-strain state of a rock mass with allowance for rheological behavior of massif and pillars.     

Modeling of Energy Density Distribution in Rock Mass on the Basis of Seismotectonic and Geodetic Data

Using the focal mechanisms of earthquakes taken place from 1950 to 1996, the type and direction of principal strains were established, which made it possible to determine the volume stress-strain state of the south-east flank of the Baikal rift zone on the basis of the inverse problem solution. The variations in the stress-strain fields and spatial distribution of the stored potential energy density were found by the displacements of the daylight surface points in Tunkinsk geodetic proving ground in 1975 - 1986.     

Stress-strain state of karst areas

Numerical modeling data on evolution of the stress-strain state of a rock mass containing a karst cavity are reported.     

Stress-strain state of a rock mass in the zone of mutual influence of workings

A method is proposed for calculation of the stress-strain state around workings of circular cross-section in the zone of influence of stoping or the daylight surface. A system of integral equations is derived. Results of numerical realization are discussed.     

Features of Extensive Deposit Mining in the Oktyabrsky Mine

The features are considered for the stress-strain state of rocks in mining the ore masses located between the mined-out spaces. The observational results of the ore-mass seismic activity are presented, as well as the convergence of mine workings and displacements of overlying rock stratum are estimated.     

Mathematical Modeling of Deformation of Elastic Rock Layer

To determine the stress-strain state of elastic layer, a system of equations to connect the boundary values of stress and displacement components is obtained.     

Determination of Strain and Stress Fields in a Rock Mass on the Basis of the Inverse Problem Solution

A new variational statement represented in the form of computational algorithm is proposed for elliptic systems of equations, which describe the behavior of structurally inhomogeneous geomedia under static loads. The inverse problem of boundary condition determination and calculated domain orientation from the point data of strain measurement is solved, which makes it possible to simulate adequately the stress-strain state of a rock mass.     

Nonlinear hereditary model of the prestressed salt rocks

The paper presents constitutive hereditary-type equations describing nonlinear behavior of a prestressed medium (salt rock mass) exposed to loading (tunnel construction). It is proposed to solve the related boundary value problem by using Newton’s quadrature method. The offered approach is illustrated with analyzing stress-strain state of salt rocks in the vicinity of a circular section tunnel.     

Mathematical Modeling of Stress Fields for the Problems of Prospecting and Mining the Hydrocarbon Deposits

The possibility of predicting the reservoir rock location is shown on the basis of finite-element modeling of the volume stress-strain state of rock mass. To increase the calculation accuracy, this method procedure is improved with regard for the conjugation conditions of the stress field components at the interfaces.     

Quasi-brittle rock failure model

The article discusses a quasi-brittle rock failure model, analytical expressions constructed for limit stresses using necessary and sufficient criteria of structured rock failure, normal tensile stresses in rock mass with crack, quasi-brittle failure diagram constructed using two-section jogged line approximation of stress-strain curves obtained in coal under tension, and critical stress estimates.     

On Effect of Terrestrial Tide Waves on the Stress-Strain State of Rock Masses

It is established that impulse manifestations of convergence of walls in development workings are caused by terrestrial tides and geosphere energy transformations dependent on the Moon's and Sun's cycles. The recommendations are made to take into account planetary dynamics of stress-strain state when scheduling and carrying out mining operations.     

Geomechanical estimate of mining conditions at the makmal gold deposit

The paper describes an estimate of the rock stress-strain state for the current mining conditions at the Makmal Gold Deposit. The rock stability in walls of open-mined chambers, in rock projections and in a dividing pillar is determined. The authors have made recommendations to backfill the mined-out space with overburden rocks and to recover pillars with the one-stage block caving technique.     

A Method of Increase in Bearing Strength of Rock Mass around a Mine Working

A problem is solved for the stress-strain state around a mine working located in rock mass with spiral surfaces of weakening. The ideal plasticity and the Coulomb friction conditions are assigned on the contacts.     

Dynamoelectric energy transfers in a rock mass under explosion load in terms of the Tashtagol mine

Based on the experimental measurements of the electromagnetic and acoustic emission in the course of stress redistribution in rocks under explosion load in the Tashtagol Mine, the paper illustrates the detection of stage-wise nucleation and development of geodynamic events as well as the evolution of the stress-strain state in rocks.