High-dam rock mass unloading relaxation evaluation method based on fusion test and monitoring data mining

An evaluation method and monitoring data technology, applied in the field of foundation soil survey, construction, infrastructure engineering and other directions, can solve the problem of lack of clear judgment standards and errors, and achieve the effect of improving the test and evaluation system

Active Publication Date: 2020-10-13
HOHAI UNIV +1
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Problems solved by technology

At present, the drilling acoustic wave testing technology is often used to detect the rock mass of the excavated dam foundation, but when it comes to the unloading and relaxation evaluation of complex rock mass such as columnar joint rock mass, there is no clear criterion for judging
In addition, the drilling acou

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  • High-dam rock mass unloading relaxation evaluation method based on fusion test and monitoring data mining
  • High-dam rock mass unloading relaxation evaluation method based on fusion test and monitoring data mining
  • High-dam rock mass unloading relaxation evaluation method based on fusion test and monitoring data mining

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Embodiment

[0058] Evaluate the unloading relaxation of a section of high dam foundation rock mass after excavation, such as figure 2 As shown, the dam foundation of this section is rectangular, with a width of 12m and a height of 2m. Columnar jointed basalt was excavated in the upper right part, and breccia lava was exposed in the rest of the excavation. A vertical penetrating fault with a width of about 0.1m was exposed in the middle. No protective layer was set during the excavation of the dam foundation section.

[0059] (1) Select point A to carry out drilling acoustic wave test. As shown in Table 6, the wave velocity at different depths of point A is obtained, and the wave velocity in deep rock mass is 5000m / s.

[0060] (2) Point A is a columnar jointed rock mass. The criterion for judging the relaxation wave velocity of columnar jointed rock mass is selected, and the relaxation depth of point A is calculated to be 1.6m.

[0061] Table 6A point wave velocity and depth

[0062] ...

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Abstract

The invention discloses a high-dam rock mass unloading relaxation evaluation method based on fusion test and monitoring data mining. The method comprises the following steps that 1, based on differentdegrees of mass reduction of rock masses at different depth positions, the relationship between a longitudinal wave velocity change coefficient in a non-columnar joint rock mass and the influence onthe mass of the rock mass is determined; 2, in combination with the indoor test of an acoustic wave test system, the relationship between the longitudinal wave velocity change coefficient in the rockmass after excavation of a columnar joint rock mass and the influence on the mass of the rock mass is determined; and 3, factors such as lithology, a structural surface and a protective layer are introduced, and the relaxation depth evaluation method of an untested area after the dam foundation excavation is established. The method considers the influence of engineering rock mass lithology, structural surface exposing, excavation measures and the like on the unloading relaxation depth after rock mass excavation, is more scientific and better meet the engineering practical situation. The evaluation method can provide an evaluation criteria for the excavation of the high-dam bed rock mass engineering, and has quite high practicability and wide applicability.

Description

technical field [0001] The invention belongs to the fields of hydraulic structures and geotechnical engineering, and in particular relates to an evaluation method for unloading relaxation of high dam rock mass which combines test and monitoring data mining. Background technique [0002] The unloading relaxation phenomenon of dam foundation rock mass during the excavation process is an important problem in the construction of high dam projects. The distribution of unloading relaxation characteristics of dam foundation rock mass is of great significance to the long-term safety of dam construction and later operation. At present, the drilling acoustic wave testing technology is often used to detect the excavated dam foundation rock mass, but when it comes to the evaluation of unloading relaxation of complex rock mass such as columnar joint rock mass, there is no clear criterion for judging it. In addition, the borehole acoustic testing technology can only detect the rock mass ...

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Application Information

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IPC IPC(8): E02D1/02
CPCE02D1/022
Inventor 徐卫亚李浩徐建荣何明杰孟庆祥闫龙
Owner HOHAI UNIV
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