Rock mass deformations as a consequence of pressurization of Cavern A, Roeda Sten.

摘要

The Roeda Sten Rock Laboratory (RSRL) is planned for various mined gas storage schemes, including compressed and refrigerated (liquefied) gas. Cavern A is designed and equipped for high gas pressure up to 8 MPa; and Cavern B for low temperatures down to -193 deg C. The first phase of tests in Cavern A were conducted in the summer of 1991, aimed to assess the fundamental properties of the rock mass such as deformability and permeability. These, in turn, form the base for comparative studies of leakage and deformation, including leakage protection measures, such as water curtains, wall liners, etc., in the later experiments. The tests in the first phase in Cavern A included water injection, shut-in, air tightness tests and water pressure tests. The water pressure tests, mainly aimed to assess deformability of the rock mass, were conducted at up to 2 MPa water pressure in two pressure cycles. This report is aimed to describe the measurement system installed around cavern A and to present preliminary interpretation and raw data from the water pressure tests. (3 refs., 48 figs., 5 tabs., appendix with raw data plottings).