高地應(yīng)力下白鶴灘地下洞室群含錯動帶巖體破壞模式及機(jī)制研究
[Abstract]:The underground caverns under construction in Baihetan are huge in scale and have the characteristics of "high side wall, long span, high ground stress and complex geological conditions". In the process of high stress excavation and unloading, Due to the influence of many large dislocation zones with strong extensibility and poor mechanical properties, the rock mass with dislocation zone encounters different degrees of deformation and failure. Combined with geological, construction, monitoring, testing and numerical analysis data, the engineering characteristics of staggered zone are discussed in detail from the aspects of occurrence, cause and characteristics of staggered zone. Then the examples of deformation failure or failure of engineering rock mass caused by dislocation zone are summarized, and the failure mode of rock mass with dislocation zone is divided into plastic extrusion tensile failure from the point of view of structural control factors. There are three types of structural stress collapse / block falling and shear slip failure. Secondly, the failure characteristics and mechanisms of all kinds of rock mass with dislocation zone are studied and analyzed, including the temporal and spatial evolution process, morphological characteristics, failure scale and so on, and the corresponding mechanical mechanisms of the three failure modes are preliminarily revealed. Finally, a typical example of rock mass failure mode analysis and support in Baihetan underground powerhouse is given, which can be used for reference for the prediction and control of rock mass instability in Baihetan underground powerhouse. The above research results have important reference value and guiding significance for the study of rock mass stability in similar underground caverns with dislocation zone under high stress conditions.
【作者單位】: 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室;東北大學(xué)深部金屬礦山安全開采研究中心;中國長江三峽集團(tuán)公司;
【基金】:國家自然科學(xué)基金國際合作重大項(xiàng)目(41320104005);國家自然科學(xué)基金重點(diǎn)項(xiàng)目(11232024);國家自然科學(xué)基金青年基金項(xiàng)目(51309219)~~
【分類號】:TU452
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