本文選題：卸荷　切入點(diǎn)：微破碎帶　出處：《工程地質(zhì)學(xué)報(bào)》2017年05期

【摘要】：在高山峽谷區(qū),淺層巖體的表生改造相當(dāng)發(fā)育。在錦屏一級(jí)水電站壩區(qū)陡峭的岸坡淺表大理巖巖體中采集定向標(biāo)本,制作定向薄片,利用偏光顯微鏡統(tǒng)計(jì)和分析了微破碎帶及帶中微裂隙的方向分布情況。結(jié)果表明,(1)垂直于最小主應(yīng)力σ_3的薄片中微破碎帶在整體上未見明顯定向性,垂直于最大主應(yīng)力σ_1或中間主應(yīng)力σ_2的薄片中微破碎帶在整體上存在明顯定向性,基本與岸坡平行;(2)微裂隙往往沿低指數(shù)晶面(包括解理面)發(fā)生,故晶內(nèi)裂隙表現(xiàn)出直線式或臺(tái)階狀樣式,這符合最小能量原理;(3)卸荷應(yīng)力場誘導(dǎo)控制微觀卸荷裂隙的方向并使之具有強(qiáng)定向性。
[Abstract]:In the alpine canyon area, the supergene transformation of the shallow rock mass is quite developed. Directional specimens are collected from the shallow marble rock mass on the steep bank slope in the dam area of Jinping 1 Hydropower Station, and directional thin pieces are made. The distribution of microfracture zone and microfracture in microfracture zone is statistically analyzed by means of polarizing microscope. The results show that the microfracture zone perpendicular to the minimum principal stress 蟽 3 has no obvious orientation on the whole. The microfracture zone in the thin slice perpendicular to the maximum principal stress 蟽 1 or intermediate principal stress 蟽 2 has a clear orientation on the whole and is basically parallel to the bank slope. The microfractures often occur along the low exponential crystal plane (including the cleavage plane). Therefore, the intergranular fracture shows a linear or step pattern, which accords with the principle of minimum energy, and the direction of the micro-unloading fracture is controlled by the induced stress field of the unloading stress field and the direction of the micro-unloading fracture is strongly oriented.
【作者單位】： 南華大學(xué)核資源工程學(xué)院;山東科技大學(xué)山東省沉積成礦作用與沉積礦產(chǎn)重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院地質(zhì)與地球物理研究所;紹興文理學(xué)院;
【基金】：國家自然科學(xué)基金重點(diǎn)項(xiàng)目(41030749) 湖南省教育廳項(xiàng)目(2015SJY25) 山東省沉積成礦作用與沉積礦產(chǎn)重點(diǎn)實(shí)驗(yàn)室開放課題(DMSM201401)資助
【分類號(hào)】：TV223
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本文編號(hào)：1700059