Pressure chamber testing device and testing method for monitoring rock breaking multivariate precursory information

Abstract

The invention discloses a pressure chamber testing device and testing method for monitoring rock breaking multivariate precursory information. The pressure chamber testing device includes a pressure chamber designed for anti-seepage sealing, wherein the pressure chamber is connected with an upper pressure plate tension transfer column system; a sample and a monitoring element are arranged inside the pressure chamber; the monitoring element is connected with data acquisition equipment outside the pressure chamber; the sample inside the pressure chamber is connected with the upper pressure plate tension transfer column system; the upper pressure plate tension transfer column system is connected with a header of the pressure chamber; a water pressing pipe is connected with the bottom of the sample; a base is arranged at the bottom of the pressure chamber; a confining pressure water inlet pipeline is arranged inside the base, and is communicated to the chamber body of the pressure chamber. According to the invention, the pressure chamber can be tested inside the chamber under the combined action of the confining pressure and water pressure on rock, so that the whole rock breaking process is visualized; besides, an osmotic pressure sensor, an acoustic emission sensor and an electrical resistivity sensor are all arranged on the sample to monitor the evolution law of breaking precursory information of rock under the action of the water pressure and the confining pressure, as a result, the rock breaking multivariate precursory information can be monitored under the action of water pressure.

Description

technical field [0001] The present invention relates to an indoor test pressure chamber device, in particular to a pressure chamber test device for monitoring multiple precursor information of rock failure under the action of water pressure. Background technique [0002] With the rapid development of tunnels and underground projects in China, the scale of tunnels and underground projects continues to expand, and the buried depth continues to increase. More and more projects are transferred to the karst mountainous areas in southwest China. Affected by groundwater and karst, water and mud inrush accidents in tunnels are increasing, resulting in a large number of casualties and property losses. A large number of engineering cases show that various precursory information will appear before geological disasters such as water and mud inrush occur. By accurately capturing and identifying precursory information and fully grasping the evolution law of precursory information, disaste...

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Problems solved by technology

Traditional rock failure information monitoring is difficult to meet the research requirements of engineering projects under complex geological conditions. The monitoring project is single, and it is impossible to realize uniaxial and triaxial (σ 2 = σ 3 ) stress state; at the same time, the precursor information released by the failure of the rock under the dual action of high ground stress and high water pressure has not been studied; there is a lack of accurate testing of the internal seepage pressure of the sample

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