【摘要】：為探求破碎巖體在壓實(shí)過程中微觀結(jié)構(gòu)的演化規(guī)律,對(duì)飽和破碎灰?guī)r進(jìn)行側(cè)向受限壓縮試驗(yàn),進(jìn)行了試樣內(nèi)部微觀結(jié)構(gòu)形態(tài)的顯微CT掃描;定量描述了壓實(shí)過程中灰?guī)r顆粒的破碎程度,分析了孔隙度與顆粒平均粒徑之間的關(guān)系;基于圖像處理技術(shù),定量分析了顆粒表面形貌的演化規(guī)律。試驗(yàn)結(jié)果表明:在飽和破碎灰?guī)r壓實(shí)過程中,顆粒破碎現(xiàn)象普遍存在,試樣內(nèi)部孔隙被壓縮或充填,孔隙間連通性變?nèi)�。顆粒的初始配比影響試樣孔隙度,相同軸向應(yīng)力下,隨著Talbot指數(shù)的增大,試樣孔隙度單調(diào)增大�？紫抖扰c顆粒平均粒徑之間滿足線性關(guān)系,孔隙度的變化可以作為描述顆粒破碎程度的一個(gè)有效參量。隨著軸向應(yīng)力的增大,顆粒的圓形度單調(diào)減小,顆粒表面形貌越來越規(guī)則,圓形度與軸向應(yīng)力之間滿足指數(shù)關(guān)系。該研究有助于深入了解破碎巖體的變形機(jī)制。
[Abstract]:In order to find out the evolution law of the microstructure of fractured rock mass during compaction, the lateral confined compression test of saturated broken limestone was carried out, and the microscopic CT scanning of the microstructure of the sample was carried out. The degree of fragmentation of limestone particles during compaction is quantitatively described, the relationship between porosity and average particle size is analyzed, and the evolution law of particle surface morphology is quantitatively analyzed based on image processing technology. The experimental results show that during the compaction of saturated broken limestone, the phenomenon of particle breakage is common, the internal pores of the sample are compressed or filled, and the connectivity between the pores becomes weaker. Under the same axial stress, the porosity of the sample increases monotonously with the increase of Talbot exponent. The relationship between porosity and average particle size is linear, and the change of porosity can be used as an effective parameter to describe the degree of particle fragmentation. With the increase of axial stress, the roundness of particles decreases monotonously, the surface morphology of particles becomes more and more regular, and the relationship between roundness and axial stress is exponential. This study is helpful to further understand the deformation mechanism of broken rock mass.
【作者單位】： 中國(guó)礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)礦業(yè)大學(xué)力學(xué)與建筑工程學(xué)院;中國(guó)礦業(yè)大學(xué)礦業(yè)工程學(xué)院;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)資助項(xiàng)目(2013CB227900) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51404266,11502229)
【分類號(hào)】：TD311

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本文編號(hào)：2132843