TY - JOUR

T1 - Method of experimental determination of deformation and flow characteristics in rocks with regular block structure

AU - Nazarov, L. A.

AU - Golikov, N. A.

AU - Skulkin, A. A.

N1 - Публикация для корректировки.

PY - 2023

Y1 - 2023

N2 - The method of evaluation of deformation and flow characteristics in rocks with quasi-regular structure is developed and tested on a laboratory scale. The method uses the idea of physical averaging and testing of samples composed of twin structural components. Using an original technology and a manmade geomaterial (mixture of calibrated sand and cryogel at a ratio of 7: 3), the plates 10×7×1 cm and cylinders (diameter 3 cm, height 6 cm) were manufactured. The cylinders were tested using standard procedures, and the characteristics of the manmade geomaterial were determined: the Young modulus Е=370 MPa, the uniaxial compression strength, the permeability km=8.4 darcy. The plates in number of 6 were used to make a layered sample with five discontinuities; the sample was subjected to stepped loading (s(n)–stress) applied in orthogonal direction to the discontinuities. From the measured contraction of the sample at the known E, the empirical constants were found for the two-parametric homographic function describing the discontinuity convergence and opening d versus s. Then, the side surface of the sample was isolated, the sample was placed in a sealed cell and subjected to the same program stepped loading. At each loading step n, the stationary flow tests were carried out, and the gas flow rate Qni was recorded at the present inlet pressure Pi. The geomechanical model of the experiment was built, and using the obtained analytical solution, the test data interpretation was undertaken: at the known values of d and km, and the measured Qni, the discontinuity permeability kf was calculated at each value of s. The empirical dependences of kf(d) and kf(s) were found.

AB - The method of evaluation of deformation and flow characteristics in rocks with quasi-regular structure is developed and tested on a laboratory scale. The method uses the idea of physical averaging and testing of samples composed of twin structural components. Using an original technology and a manmade geomaterial (mixture of calibrated sand and cryogel at a ratio of 7: 3), the plates 10×7×1 cm and cylinders (diameter 3 cm, height 6 cm) were manufactured. The cylinders were tested using standard procedures, and the characteristics of the manmade geomaterial were determined: the Young modulus Е=370 MPa, the uniaxial compression strength, the permeability km=8.4 darcy. The plates in number of 6 were used to make a layered sample with five discontinuities; the sample was subjected to stepped loading (s(n)–stress) applied in orthogonal direction to the discontinuities. From the measured contraction of the sample at the known E, the empirical constants were found for the two-parametric homographic function describing the discontinuity convergence and opening d versus s. Then, the side surface of the sample was isolated, the sample was placed in a sealed cell and subjected to the same program stepped loading. At each loading step n, the stationary flow tests were carried out, and the gas flow rate Qni was recorded at the present inlet pressure Pi. The geomechanical model of the experiment was built, and using the obtained analytical solution, the test data interpretation was undertaken: at the known values of d and km, and the measured Qni, the discontinuity permeability kf was calculated at each value of s. The empirical dependences of kf(d) and kf(s) were found.

KW - block sample

KW - discontinuity

KW - flow

KW - laboratory experiment

KW - manmade geomaterial

KW - permeability

KW - stress

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85179467186&origin=inward&txGid=f455831b6a5d9c0a9773d8974bff2165

UR - https://www.mendeley.com/catalogue/76ae2770-15e0-33f6-864a-084f1584d9c5/

U2 - 10.25018/0236_1493_2023_11_0_70

DO - 10.25018/0236_1493_2023_11_0_70

M3 - Article

SP - 70

EP - 81

JO - Горный информационно-аналитический бюллетень

JF - Горный информационно-аналитический бюллетень

SN - 0236-1493

IS - 11

ER -