本文選題：相似模型試驗　切入點：多裂紋試樣　出處：《重慶大學(xué)》2016年碩士論文

【摘要】：應(yīng)用相似模型試驗手段研究多裂隙巖體,并運用相關(guān)研究成果解決當(dāng)前的一些巖土工程問題在現(xiàn)階段具有實際的工程意義和指導(dǎo)作用。本文首先根據(jù)物理力學(xué)相似理論和前人有關(guān)相似試驗的研究結(jié)果,找到能夠模擬軟、硬巖的延、脆性相似材料,澆筑試樣并預(yù)制裂紋,再對其進(jìn)行單軸加載試驗,運用數(shù)字圖像技術(shù)采集試驗中試樣破壞的圖像信息,利用在試驗過程中獲得的各個試樣的圖像數(shù)據(jù)、荷載數(shù)據(jù)、位移數(shù)據(jù),對裂紋的起裂、擴(kuò)展和試樣的貫通、破壞情況進(jìn)行分析,取得的研究成果如下:(1)在巖石相似材料研究的基礎(chǔ)上,采用砂作為粗骨料和重晶石作為細(xì)骨料,酒精作為有機(jī)溶劑,分別用“環(huán)氧樹脂和聚酰胺”(簡稱“環(huán)-聚”)作為膠凝材料模擬軟巖進(jìn)行延性材料多裂紋相似模型試驗,以及用“松香”作為膠凝材料模擬硬巖進(jìn)行脆性材料多裂紋相似模型試驗。(2)通過改變原材料的配比發(fā)現(xiàn):原材料(“環(huán)-聚”或“松香”)含量的變化對試樣的力學(xué)性質(zhì)影響較大。隨著“環(huán)-聚”或松香的配比不斷增加,試樣的起裂應(yīng)力及峰值應(yīng)力也不斷增大,連接應(yīng)力也不斷增大。(3)通過改變裂紋的分布發(fā)現(xiàn):裂紋的幾何分布對試樣裂紋的連接模式有著直接的影響。裂紋起裂以翼型裂紋為主,連接模式主要為翼型裂紋與次生共面裂紋的搭接將預(yù)制裂紋連接起來。(4)對比延性和脆性試樣結(jié)果可知:從破壞模式的上看,延性組(環(huán)-聚組)試件破壞基本上是以拉剪復(fù)合破壞模式為主,而脆性組(松香組)試件的破壞模式包括拉剪復(fù)合型和張拉型破壞模式;從力學(xué)特性上看,延性組試樣的起裂應(yīng)力和峰值應(yīng)力在一個較小的范圍內(nèi)波動,而脆性組的這個波動范圍較延性組更大一些;對比延性組試樣,脆性組試件破壞時產(chǎn)生的裂紋更多,尤其在試樣表面產(chǎn)生了更多的微裂紋。(5)本文采用DIC數(shù)字散斑動態(tài)應(yīng)變測量分析系統(tǒng)對裂紋起裂、擴(kuò)展和連接過程進(jìn)行了動態(tài)和實時捕捉,并分析了含裂紋試件破壞過程的位移場和應(yīng)變場,結(jié)合試樣的應(yīng)力應(yīng)變曲線,發(fā)現(xiàn)試件破壞過程中的位移和應(yīng)變變化趨勢與曲線基本一致,應(yīng)變場和位移場圖與宏觀表面裂紋起裂、連接和試件的貫通、破壞過程高度一致,驗證了該測量方法能夠建立起細(xì)觀力學(xué)與宏觀力學(xué)的聯(lián)系。
[Abstract]:The similar model test method is used to study the multi-fractured rock mass. And the application of relevant research results to solve some current geotechnical engineering problems has practical engineering significance and guidance at the present stage. Firstly, according to the theory of physical and mechanical similarity and the research results of previous similar tests, It is found that it can simulate the ductility and brittleness of soft and hard rock, cast the specimen and preform the crack, then carry out uniaxial loading test on it, and use digital image technology to collect the image information of the specimen damage in the test. Using the image data, load data and displacement data of each specimen obtained during the test, the crack initiation, propagation and failure of the specimen are analyzed. The results are as follows: (1) based on the study of similar rock materials, sand is used as coarse aggregate and barite as fine aggregate, alcohol as organic solvent. Using "epoxy resin and polyamide" (referred to as "cyclization") as cementitious materials to simulate soft rock, the similar model tests of ductile materials with multiple cracks were carried out. And using "rosin" as the cementing material to simulate hard rock for the similar model test of brittle materials with multiple cracks. (2) by changing the ratio of raw materials, it is found that the mechanical properties of the samples are affected by the change of the content of raw materials ("ring polymerization" or "rosin"). With the increasing of the ratio of "ring polymerization" or rosin, The crack initiation stress and peak stress are also increasing, and the joint stress is also increasing. 3) by changing the crack distribution, it is found that the geometric distribution of the crack has a direct effect on the crack joining mode of the specimen, and the crack initiation is mainly caused by the airfoil crack. The connection mode is mainly the overlap of the airfoil crack and the secondary coplanar crack to connect the precast crack with the precast crack. The results of ductility and brittleness show that: from the view of the failure mode, The failure mode of ductile group (ring-cluster group) is basically tension-shear composite failure mode, while the failure mode of brittle group (rosin group) is composed of tension-shear composite failure mode and tension-tensile failure mode. The crack initiation stress and peak stress of ductile group fluctuate in a small range, while that of brittle group is larger than that of ductile group. Especially, more micro-cracks are produced on the surface of the specimen.) in this paper, the crack initiation, propagation and bonding process are captured dynamically and in real time by using the DIC digital speckle dynamic strain measurement and analysis system. The displacement field and strain field of cracked specimen are analyzed. Combined with the stress-strain curve of the specimen, it is found that the variation trend of displacement and strain in the failure process of the specimen is basically the same as that of the curve. The strain field and displacement field diagram are highly consistent with the macroscopic surface crack initiation, connection and fracture process. It is verified that the measurement method can establish the relationship between micromechanics and macroscopic mechanics.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU45

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