Method for grading engineering stability of jointed rock mass

Abstract

The invention discloses a method for grading the engineering stability of jointed rock mass. The method comprises the following steps: developing an engineering geological survey and an indoor rock mechanics experiment; performing blockness calculation: initially collating structural surface data, determining the size of representative elementary volume and building a jointed rock mass mathematical model; directly grading and evaluating by comparing evaluation standard according to each index of the specific engineering; determining four indexes comprising rock mass blockness, rock uniaxial compressive strength, jointing condition and underground water condition according to the influence degree of each index on the engineering stability of the jointed rock mass so as to determining the grade of the engineering stability of the jointed rock mass. The method describes the integrity of the jointed rock mass from three-dimensional space so as to reflect the engineering stability of the jointed rock mass objectively and really. Compared with the traditional method, the method disclosed by the invention can effectively reduce a large amount of money and time consumed by obtaining ROQ value by drilling.

Description

technical field [0001] The invention relates to a rock mass quality evaluation and classification method, in particular to a cracked rock mass engineering stability classification method. Background technique [0002] The mechanical properties of the rock mass are quite complex due to the different rock properties and tissue structures that make up the rock mass, as well as the differences in the development of structural planes in the rock mass. The key points and difficulties of construction. In order to distinguish the quality of rock mass and the difference in stability in engineering design and construction, it is necessary to make a reasonable and effective classification of rock mass to provide a basis for engineering structure parameter selection, safety production management, and economic benefit evaluation. [0003] At present, there are many kinds of engineering rock mass classification (classification) methods commonly used at home and abroad, such as RQD method...

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the problem that the integrity description of the fractured rock mass is not realistic enough in the traditional rock mass stability grading method, and to provide a method that consumes less funds and takes less time to obtain RQD, and the stability grading has a greater impact on safety management. A Classification Method for Engineering Stability of Fractured Rock Mass with High Guidance Reliability

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