Method, system and equipment for quantitative detection and strengthening plan during time-dependent weakening of surrounding rock

Abstract

The invention discloses a method, a system and equipment for a quantitative detection and strengthening plan during time-dependent weakening of a surrounding rock. In an underground engineering construction process, physical and mechanical properties of a surrounding rock body tend to generate a time-dependent weakening effect due to change of an occurrence environment, the time-dependent weakening degree of a surrounding rock can be quantitatively acquired in real time by use of the method, the system and the equipment. The detection method mainly comprises the following steps of acquiring initial surrounding rock strengths of an excavation body at different depths on site when the excavation body is not weakened at a set observation area; calculating an initial surrounding rock average strength through the initial surrounding rock strengths; acquiring the surrounding rock strengths of different depths at the set observation area on site and calculating the average strength of a surrounding rock within the set time after the weaken phenomenon occurs; comparing the changing situations of the surrounding rock average strength relative to the initial surrounding rock average strength; and providing a design scheme of a surrounding rock support form and / or a strengthening range plan.

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 quantitative detection of time-varying weakening of surrounding rock and reinforcement plan design. 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 dr...

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Problems solved by technology

[0004] 1. Due to the complexity of the 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

[0005] 2. The on-site rock samples are susceptible to weathering and other influences during transport 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

[0006] 3. Using the drilling method takes a long time interval from on-site coring to getting the test report, which seriously restricts the progress of the construction and increases the cost of the project budget

[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 treat the rock samples with soaking water, it is still difficult to simulate the watering state of the rock on site, and the research on the weakening characteristics of the rock is not accurate enough

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