本文關(guān)鍵詞： 巖石力學(xué) 單軸壓縮 力學(xué)特性 顆粒流　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年11期 　論文類型：期刊論文

【摘要】：圓孔作為一種典型的巖石缺陷,對巖石的力學(xué)特性具有重要影響。采用室內(nèi)試驗(yàn)及PFC2D程序,構(gòu)建含雙圓孔類巖石試樣并對其進(jìn)行單軸壓縮試驗(yàn),研究其不同圓孔間距、傾角組合條件下的強(qiáng)度、裂紋模式及破裂孕育演化特征。研究表明:(1)當(dāng)間距不變時(shí),隨傾角的增大,試樣單軸抗壓強(qiáng)度呈先減小后增大的趨勢,且在傾角為45°~60°時(shí)達(dá)到最低單軸抗壓強(qiáng)度;當(dāng)傾角為90°恒定時(shí),隨間距的增大,試樣單軸抗壓強(qiáng)度呈先增大后減小的趨勢,且在間距為40 mm左右時(shí)達(dá)到最大單軸抗壓強(qiáng)度。(2)試樣產(chǎn)生的裂紋類型可分為I型(張拉型)裂紋、II型(剪切型)裂紋、III型(混合型)裂紋等三類。當(dāng)孔距較近時(shí),隨傾角的增大,圓孔間裂紋類型逐漸由III型裂紋轉(zhuǎn)變?yōu)镮I型裂紋,兩圓孔靠近加載端部一側(cè)的孔壁逐漸產(chǎn)生I型裂紋,靠近試樣兩側(cè)邊界處的孔壁始終會產(chǎn)生II型裂紋。當(dāng)傾角為90°恒定時(shí),隨間距的增大,兩孔間相互作用減弱,但兩圓孔靠近加載端部一側(cè)及靠近試樣兩側(cè)邊界處的孔壁,始終分別產(chǎn)生I型裂紋和II型裂紋。(3)兩孔間巖橋連線上的II型裂紋首先產(chǎn)生,其次在圓孔靠近加載端部一側(cè)的孔壁產(chǎn)生I型裂紋,最后在圓孔靠近試樣兩側(cè)邊界處的孔壁產(chǎn)生II型裂紋。通常構(gòu)成II型裂紋的聲發(fā)射事件破裂強(qiáng)度,高于構(gòu)成I型裂紋的聲發(fā)射事件破裂強(qiáng)度。
[Abstract]:As a typical rock defect, circular pore has an important influence on the mechanical properties of rock. Laboratory test and PFC2D program are used to construct the specimen containing double circular pore and carry out uniaxial compression test. The strength, crack mode and fracture evolution characteristics of different circular hole spacing, dip angle combination condition are studied. The results show that when the spacing is constant, the crack pattern increases with the inclination angle. The uniaxial compressive strength of the sample decreases first and then increases, and reaches the lowest uniaxial compressive strength when the inclination angle is 45 擄~ 60 擄. When the inclination angle is 90 擄, the uniaxial compressive strength of the specimen increases first and then decreases with the increase of the distance. The crack types of specimens with maximum uniaxial compressive strength of about 40 mm can be divided into mode I (tensile mode) cracks and mode II (shear mode) cracks. When the hole distance is near, with the increase of inclination angle, the type of crack between circular holes gradually changes from III mode crack to mode II crack. A mode I crack is gradually produced in the hole wall near the loading end side of the two round holes, and a mode II crack is always produced in the hole wall near the boundary of both sides of the specimen. When the inclination angle is 90 擄, the crack will increase with the increase of the distance. The interaction between the two holes is weakened, but the two round holes are near the side of the loading end and the pore wall near the boundary of both sides of the specimen. The mode II cracks on the rock bridge line between the two holes, mode I crack and mode II crack respectively, are produced first, and then on the wall of the hole near the loading end of the round hole. Finally, the mode II crack is produced in the hole wall near the boundary of both sides of the specimen, and the AE event rupture intensity of the mode II crack is usually higher than that of the mode I crack.
【作者單位】： 北京科技大學(xué)金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室;中國電建路橋集團(tuán)有限公司;中鐵十六局集團(tuán)有限公司;
【基金】：國家青年科學(xué)基金資助項(xiàng)目(51504016) 科技北京百名領(lǐng)軍人才培養(yǎng)工程(Z151100000315014) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(FRF TP 16 021A3)~~
【分類號】：TU45
【正文快照】： 作為天然的非均質(zhì)工程地質(zhì)材料,巖石內(nèi)部含有許多宏觀和細(xì)觀的裂隙、孔洞等缺陷。巖石的力學(xué)特性與其內(nèi)部缺陷的形狀、大小、幾何分布等均有密切的聯(lián)系,其裂紋起裂、擴(kuò)展、搭接、貫通等過程受巖石缺陷的影響較大。因此,深入開展缺陷對巖石破裂機(jī)制及演化規(guī)律影響的研究,一直以

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