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Sampling method of rock mass with weak structure surfaces

A technology for weak structural planes and rock masses, applied in sampling devices and other directions, can solve the problems of deviation of water content of rock mass samples and inability to obtain undisturbed rock mass samples.

Active Publication Date: 2017-05-31
HOHAI UNIV
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  • Abstract
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Problems solved by technology

[0004] Purpose of the invention: To provide a rock mass sampling method with weak structural planes in view of the existing rock mass sampling techniques that cannot obtain undisturbed rock mass samples, and the water content in the obtained rock mass samples is deviated from the field.

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  • Sampling method of rock mass with weak structure surfaces
  • Sampling method of rock mass with weak structure surfaces
  • Sampling method of rock mass with weak structure surfaces

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Embodiment Construction

[0029] The technical scheme of the present invention will be further described below in conjunction with the drawings.

[0030] Taking the sampling of the interlayer dislocation zone of the rock wall of the traffic tunnel as an example, the sample selected in this embodiment is a cube with a side length of 150 mm.

[0031] The sampling method of the rock mass containing weak structural planes of the present invention is as follows:

[0032] 1) Site selection: On the rock wall of the traffic tunnel, a plane of about 300mm is manually chiseled out as the sampling plane 100, with a size fluctuation not exceeding 1cm; when chiseling to a position close to the weak structural surface, pay special attention to avoid Cause disturbance.

[0033] 2) Marking: Mark the square sample area 3 with a side length of 150mm on the flattened sampling plane 100. To facilitate subsequent sampling, mark the square sampling area 5 with the sample area 3 as the center. The side length is 170mm, such as figu...

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Abstract

The invention discloses a sampling method of rock mass with weak structure surfaces. The method comprises the following steps: selecting a sampling part with weak structure surfaces and chiseling the sampling part to form a plane; pre-marking a sample area on the sampling plane, wherein hard rock layers at the upper part and the lower part of a weak structure layer are equal in thickness; paving steel wires on the surface of the sample area and coating a protection layer; cutting inwards by taking the edge of the protection layer as a base line vertical rock wall to form a side surface and a back surface of the sample, and protecting all the surfaces; curing the cut samples on the site and grinding the samples to obtain samples which meet the size requirement; chiseling the protection layer of the weak structure layer, sealing and filling the samples and enabling the samples to maintain the water content on the sampling site; then transporting the samples to a laboratory, cutting off the steel wires paved on the surfaces, enabling the weak structure layer to be exposed, and filling the samples in a cutting box for carrying out experiment. The method is capable of simply and conveniently obtaining disturbance-free complete rock samples with the same water content of the site and can be used for directly detecting basic rheological properties of the rock indoors.

Description

Technical field [0001] The invention relates to an in-situ sampling method for rock masses, in particular to a method for sampling rock masses containing weak structural planes. Background technique [0002] In the long process of geological evolution, the complete rock mass is subjected to various structural geological actions, resulting in various weak structural planes, such as faults, interlayers, interlayer and intralayer dislocation zones. These weak structural surfaces are filled with clay, mud and rock fragments, and the strength is much lower than that of the complete rock mass, which directly controls the stability of the entire underground cavern. At the same time, after excavation and unloading, an open surface is formed, and the weak structural surface directly affects the deformation of large-scale rock engineering. The strength of weak structural surfaces is greatly affected by the moisture content. Therefore, the experimental research on the basic rheological pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/04
CPCG01N1/04
Inventor 贾朝军徐卫亚王如宾闫龙林志南王苏生滕志强
Owner HOHAI UNIV
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