Detection method for rheological behaviors of hard, fragile and crushed rock body of dam foundation
A technology of rheological properties and detection methods, which is applied in the direction of soil material testing, material inspection products, etc., and can solve problems such as blank detection methods
Active Publication Date: 2015-05-27
POWERCHINA CHENGDU ENG
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The results mainly focus on the experimental research on the rheological properties of soft rocks. The uniaxial and triaxial compression creep tests under different loading conditions are mainly aimed at the deformation resistance of rock mass. The detection method of rheological properties of "hard, brittle, broken" rock mass is still blank
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[0033] "Hard, brittle, and broken" rock systems refer to rock masses that are hard, brittle, and developed with subtle cracks. After loading, they are prone to instantaneous elastic deformation, and after unloading and releasing pressure, subtle cracks are easy to appear. This type of rock mass generally has a uniaxial saturated compressive strength greater than 60 MPa, and subtle cracks are developed in the rock mass, such as basic igneous rocks and dolomite in sedimentary rocks. Under the long-term action of excavation unloading, dam body load and high permeable water pressure, the rock mass of the dam foundation will show time-related deformation characteristics, mainly manifested as relaxation, creep, elastic aftereffect, aging strength and rheological damage Fractures, etc., will adversely affect the construction safety and long-term operation stability of the high arch dam. It is necessary to deepen the investigation and design demonstration, and take targeted basic treat...
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Abstract
The invention relates to a rock body rheological detection method and provides a detection method for rheological behaviors of a hard, fragile and crushed rock body of a dam foundation. The detection method comprises the following steps: firstly, detecting corrosion characteristics of the hard, fragile and crushed rock body of the dam foundation to obtain the rock body rheological influence quantity; secondly, forming a long observation hole for a dam foundation system, and testing an excavation relaxation effect of the hard, fragile and crushed rock body of the dam foundation by using drilling sound waves and panoramic picture which are combined with corrosion characteristics and an unloading test; thirdly, selecting a representative rock of the hard, fragile and crushed rock body of the dam foundation, carrying out a rheological test, and carrying out mineralogical characteristic acquisition on the tested rock body before and after the test; and finally, carrying out mineralogical characteristic calculating according to the rock body rheological influence quantity and an excavation relaxation effect of the hard, fragile and crushed rock body of the dam foundation, and the rock body of the representative rock before and after the testto obtain a stress-strain and time relation curve of the hard, fragile and crushed rock body of the dam foundation and further so as to determine the rheological behaviors of the hard, fragile and crushed rock body of the dam foundation. The method is applicable to researches of the dam foundation of water resources and hydropower projects.
Description
technical field [0001] The invention relates to a rock mass detection method, in particular to a detection method for the rheological characteristics of "hard, brittle and broken" rock mass of a dam foundation. Background technique [0002] A large number of high arch dams that have been built, are under construction and are under construction have emerged in western my country. The scale of these high arch dam projects is huge, and they are all required to be built on hard and relatively complete rock mass. During the design process of high arch dams, the construction of arch dams The selection of bedrock is very important. The foundation of high arch dams should use hard and complete rock mass, but there are often some geological defects in the foundation of the dam, such as discontinuous weak structural planes, weak interlayers, altered rock zones and interlayer extrusion displacement. belts and other weak rock belts and "hard, brittle, broken" rock masses, etc. "Hard, bri...
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IPC IPC(8): G01N33/24
Inventor 李文纲邓忠文徐敬武蔡斌贺如平沙椿朱可俊沈军辉
Owner POWERCHINA CHENGDU ENG
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