Method, system and equipment for rapid quantitative detection of regional weakening of surrounding rock in underground engineering

Abstract

The application discloses a rapid quantitative detection method, system and equipment for regional weakening of surrounding rock in underground engineering. The method includes the following steps: acquiring the weakened surrounding rock strength of the excavated body at different depths in the set observation area on site, and calculating the average strength of the weakened surrounding rock; And / or the change of the average strength of the weakened surrounding rock over time to detect the weakening degree of the surrounding rock. During the construction of underground engineering, with the excavation of the chamber, the rock mass around the chamber is disturbed, forming the surrounding rock in the original rock area and the surrounding rock in the plastic area, and the above-mentioned surrounding rock will be weakened to a certain extent as time goes by. By obtaining the strength of the surrounding rock on site, the mechanical indicators of the weakened surrounding rock in each area can be obtained more quickly and directly. The obtained data does not depart from the constraints of the original environment, stress field, temperature, etc., and can well represent the rock mass itself. Strength of.

Description

technical field [0001] The present disclosure generally relates to the technical field of underground engineering safety, and in particular to a method, system and equipment for rapid quantitative detection of regional weakening of surrounding rock in underground engineering. Background technique [0002] With the continuous development of underground engineering construction in my country, underground engineering construction gradually extends to complex geological conditions. Due to the complexity of the rock formation itself and the limitations of the detection range and accuracy of existing detection technologies, it may be encountered during the excavation of roadways. The situation of gushing water from water-rich rock formations. Since the properties of surrounding rocks vary widely, the weakening and hydrolysis characteristics of different rocks after contact with water are also different. In the existing underground engineering construction design, the method of dri...

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Problems solved by technology

[0004] 1. The process needs to go through drilling and coring, transportation, and water simulation of rock samples in the indoor test stage. Therefore, the time interval from on-site coring to test report is long, and the construction period is delayed.

[0005] 2. Due to the complexity of geological conditions at the construction site, it is often difficult to obtain complete samples during drilling and coring of surrounding rocks, and it is often difficult to obtain accurate results in laboratory tests

[0006] 3. On-site rock samples are easily affected by weathering and other effects during transportation to the laboratory, and the rock properties have changed. The obtained data cannot accurately reflect the initial physical properties and mechanical parameters of the local rocks

[0007] 4. Since the cores taken have been separated from the original environmental stress, temperature and other constraints, especially the sampling of the original rock area, it cannot well represent the strength of the rock mass itself

[0008] 5. Although the indoor test can be used to soak and sprinkle the rock samples, it is still difficult to simulate the state of the rocks affected by the groundwater conditions, and the research on the weakening characteristics of the rocks is not accurate enough

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