Method for determining rock mass integrity index Kv under high ground stress condition

By using a high-pressure rock triaxial dynamic testing system in high-level stress areas to restore the in-situ stress environment and calculate the rock mass integrity index Kv, the problem of abnormal calculation results of rock mass integrity index Kv is solved, and more accurate rock mass quality evaluation is achieved, reducing engineering risks and costs.

CN120404945APending Publication Date: 2025-08-01WUHAN CCCC ENG SURVEY CO LTD
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Patent Information

Application Number
CN202510900570.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2025-08-01

AI Technical Summary

Technical Problem

In highland stress areas, the calculation results of the rock mass integrity index Kv are affected by ground stress, resulting in abnormal wave velocity tests, which are difficult to accurately reflect the actual integrity of the rock mass. The existing methods cannot effectively solve this problem.

Method used

The three-axis dynamic testing system for high-pressure rocks is used to restore the in-situ stress environment. Through on-site ground stress testing and standard cylindrical sample wave velocity stress test, the rock mass integrity index Kv is calculated. Considering the impact of confining pressure, the rock mass integrity index Kv is calculated using the formula.

Benefits of technology

More accurately reflect the actual integrity of the rock mass, provide more reliable rock mass quality evaluation, provide scientific basis for engineering design and construction, reduce project risks, improve safety and reduce costs.

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Abstract

The invention discloses a rock mass integrity index Kv determination method under a high crustal stress condition, and relates to the technical field of rock mass basic quality evaluation, and the method comprises the following steps: carrying out field crustal stress test to obtain the crustal stress of a rock mass and the elastic longitudinal wave velocity of the rock mass; if the result of the field crustal stress test is judged to be extremely high crustal stress or high crustal stress, determining a rock mass integrity index Kv according to the following method; a high-pressure rock triaxial dynamic test system is used for carrying out a standard cylinder sample wave velocity stress test for recovering the confining pressure of an original ground stress environment, and the elastic longitudinal wave velocity of the standard cylinder sample considering the confining pressure is obtained. The rock mass integrity index Kv is calculated based on the longitudinal wave velocity of the rock mass and the elastic longitudinal wave velocity of the standard cylinder sample, the rock core unloading effect caused by high ground stress is considered, the actual integrity of the rock mass is accurately reflected, and the problem that the Kv value is too high in a traditional method is solved. By more accurately calculating the Kv value, the rock mass quality is more scientifically evaluated, and a more reliable basis is provided for engineering design and construction.
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