Method, system and device for rapidly and quantitatively detecting zonal weakening of surrounding rock of underground engineering

Abstract

The invention discloses a method, a system and a device for quickly and quantitatively detecting the zonal weakening of the surrounding rock of underground engineering. The method comprises the following steps: onsite obtaining the weakened surrounding rock strength of an excavation body at different depths in a preset observation area, and calculating the average strength of the weakened surrounding rock; and detecting the weakening degree of the surrounding rock according to the change of the average strength of the weakened surrounding rock relative to the initial average strength of the surrounding rock and/or the change of the average strength of the weakened surrounding rock with time. The surrounding rock is disturbed with the excavation of a chamber in the construction process of the underground engineering forms a protolith zone surrounding rock and a plastic zone surrounding rock, and the surrounding rocks are weakened to a certain degree with the passage of time. The strength of the surrounding rock is obtained onsite, the direct obtaining of the mechanical indexes of the surrounding rock tending to be weakened in every zone is accelerated, and obtained data does not deviate from the original occurrence environment, stress field, temperature and other constraints, and can well represent the self strength of the rock.

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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