Abstract
Faults or joints widely exist in rock masses, which deeply affect the mechanical properties of rock. The seismic frequency of the Gaoqiao fault and its surrounding areas in the Three Gorges Reservoir area before and after water storage is significantly higher than that in other areas. In this study, a curved joint is used to simulate the occurrence characteristics of the Gaoqiao fault, and the influence of reservoir water is simulated by adjusting the fracture water pressure. Compared with the changes of joint surface morphology parameters before and after the test, it is found that the macro failure characteristics of rock samples are in good agreement with the micromorphology changes of the joint surface. Among them, the parameters such as root-mean-square height (Sq), arithmetic mean height (Sa), reverse load area ratio (Smc), and minimum autocorrelation length (Sal) can better characterize the joint surface deterioration of rock samples under the action of fracture water pressure. The test results have a certain reference value for studying the fault response under the action of reservoir water.
Highlights
Faults or joints are widespread in rock masses, and the mechanical characteristics of the rock masses vary with the environment in which they occur [1]
It can be inferred from the various characteristics of the above joint surface that under the joint action of external load and water, more failure cracks will appear in the lower half of the fault, to form more reservoir water infiltration channels, which may induce deeper earthquakes
Through the triaxial compression test, the article considers the effects of dry and saturated conditions and the water pressure of different fracture surfaces, combined with the failure characteristics of the sample, and analyzes the degree of change of the topography parameters on the joint surface. It is concluded as follows: For curved joints, under pressure, the adjacent surfaces contacted by the joint have different degrees of wear
Summary
Faults or joints are widespread in rock masses, and the mechanical characteristics of the rock masses vary with the environment in which they occur [1]. The study of the mechanical response of joint surface under natural water provides a new idea for studying geological disasters and reservoir earthquakes in reservoir areas. The deep rock mass in the reservoir area is affected by water pressure at the fracture surface and pore water pressure, which makes its mechanical properties more complex. Immersion saturation of rock mass with listric fault in the reservoir area and crack water pressure are considered. Different fracture water pressures are applied to the fractured surface of rock samples to simulate the dry and wet state of rock mass during impounding. The test results can provide some reference for mechanical response research of listric fault structure in the reservoir area. According to the fitting formula of triaxial compressive strength under different confining pressures, the uniaxial compressive strength is 129 MPa
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