發(fā)布時(shí)間：2018-04-30 06:31

  本文選題：3D打印 + 試樣制備�。� 參考：《南京大學(xué)》2015年碩士論文

【摘要】：以往巖石力學(xué)室內(nèi)試驗(yàn)樣品主要通過野外取樣(原巖樣品)或模具澆筑(類巖石材料樣品)兩種方法獲得,但由上述兩種方法取得的樣品均存在一些問題,如天然巖石內(nèi)部難以被觀測(cè)到、不存在完全相同的兩塊巖石、澆筑樣品時(shí)產(chǎn)生的氣泡沉淀等,同時(shí)巖石力學(xué)試驗(yàn)又大多是破壞性試驗(yàn),這使得需要較多樣品完成的試驗(yàn)(如不同圍壓下的巖石特性、巖石動(dòng)靜態(tài)試驗(yàn)等)會(huì)因?yàn)闃悠返牟町惗斐蓴?shù)據(jù)離散性較大(有時(shí)甚至?xí)䦟?duì)研究者產(chǎn)生誤導(dǎo)),進(jìn)而對(duì)巖石力學(xué)研究起到一定的障礙作用。因此,本文對(duì)一種全新的樣品制備方法—3D打印技術(shù)進(jìn)行了初步探討,希望為巖石力學(xué)研究中的樣品制備提供一種新的思路。本文針對(duì)以石膏粉末和光敏樹脂為原材料的3D打印樣品及砂巖試樣,進(jìn)行了 CT掃描、物理力學(xué)和滲透指標(biāo)的測(cè)試及分析,獲得主要結(jié)論如下:(1)石膏粉末樣品打印時(shí),雖然每層石膏粉末厚度可控,但用于固結(jié)的膠水量不可控,最終導(dǎo)致各石膏粉末樣品間差異較大,其對(duì)應(yīng)的物理力學(xué)性質(zhì)指標(biāo)也相去甚遠(yuǎn),因而無法用于制作重復(fù)性較好的類巖石試樣。(2)以半透明的光敏樹脂為原材料進(jìn)行樣品制作時(shí),通過后續(xù)加工處理能去除打印過程中填充在有效孔隙中的蠟質(zhì)材料,因此,使用光敏樹脂3D打印技術(shù)可打印含有有效孔隙的樣品。(3)通過CT掃描與圖像分析,確認(rèn)各光敏樹脂樣品間的幾何特征較為一致,而樣品與原模型之間存在一定偏差,主要體現(xiàn)在封閉孔隙被蠟質(zhì)材料填充及錯(cuò)臺(tái)效應(yīng)導(dǎo)致的小孔隙變形或堵塞。(4)通過對(duì)光敏樹脂樣品和砂巖物理力學(xué)和滲透指標(biāo)進(jìn)行測(cè)試,發(fā)現(xiàn)光敏樹脂樣品的各項(xiàng)指標(biāo)差異性遠(yuǎn)小于砂巖樣品,驗(yàn)證了光敏樹脂樣品可重復(fù)性較好。同時(shí)單軸壓縮試驗(yàn)中光敏樹脂樣品破壞時(shí)的壓縮量超過25%,塑性較高,因此該材料不能很好的模擬類巖石材料的抗壓特性,但滲透試驗(yàn)結(jié)果表明光敏樹脂樣品可較好的應(yīng)用于具有較大孔隙或裂隙樣品的滲透測(cè)試。
[Abstract]:In the past, the samples of laboratory test of rock mechanics were mainly obtained by two methods: field sampling (original rock samples) or mold casting (rock like materials samples). However, there are some problems in the samples obtained from the above two methods. For example, it is difficult to observe the interior of natural rock, there are not two identical rocks, the bubble precipitates produced by pouring samples, and most of the rock mechanics tests are destructive tests at the same time. This results in tests that require a larger number of samples (such as rock characteristics under different confining pressures), Because of the difference of the samples, the data dispersion (sometimes even misled to the researchers) will be caused by the rock dynamic and static test, which will play a certain obstacle to the study of rock mechanics. Therefore, a new method of sample preparation-3D printing is discussed in this paper, in order to provide a new idea for the study of rock mechanics. In this paper, 3D printed samples and sandstone samples with gypsum powder and Guang Min resin as raw materials are tested and analyzed by CT scanning, physical mechanics and permeability. The main conclusions are as follows: 1) when the gypsum powder sample is printed, Although the thickness of each layer of gypsum powder is controllable, the amount of glue used for consolidation is not controllable, resulting in great differences between the samples of gypsum powder and the corresponding physical and mechanical properties. Therefore, it can not be used to make more reproducible rock-like sample. 2) when the translucent Guang Min resin is used as the raw material for sample making, the waxy material filled in the effective pore during the printing process can be removed by subsequent processing, so, By using Guang Min resin 3D printing technique, we can print samples with effective pores. (3) by CT scanning and image analysis, we can confirm that the geometric characteristics of the samples of Guang Min resin are consistent, but there is a certain deviation between the samples and the original model. Mainly reflected in the small pore deformation or blockage caused by the filling of sealed pores with waxy materials and staggered platform effect.) the physical, mechanical and permeability indexes of Guang Min resin samples and sandstone were tested. It is found that the difference of indexes of Guang Min resin sample is much less than that of sandstone sample, which verifies the reproducibility of Guang Min resin sample. At the same time, in uniaxial compression test, the compression amount of Guang Min resin sample is more than 25% and the plasticity is high, so the material can not simulate the compressive properties of rock-like material very well. However, the results of permeation test show that Guang Min resin sample can be applied to the permeability test of samples with large porosity or fissure.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU45

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本文編號(hào)：1823460