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    题名: 混成岩模型試體製作與體積比量測;Methods of Preparing Artificoal Melange Model and Volumetric Proportion Measurement
    作者: 劉哲明;Che-Ming Liu
    贡献者: 土木工程研究所
    关键词: 併構岩;混成岩;橫向等向性;transversely isotropic;bimrock;melange
    日期: 2002-06-28
    上传时间: 2009-09-18 17:10:21 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 混成岩為泥質填充物夾著許多外來岩塊或岩屑所組成,其力學性質受到異質性和異向性之影響,由於混成岩取樣不易,且很難自現地取得數量足夠之試體進行試驗。本研究採用水泥和高嶺土等材料調配不同之配比,製作出人造混成岩試體,以供日後研究之所需。 本研究初步以FLAC有限差分軟體分析混成岩之尺寸效應及顆粒尺寸之影響。根據分析結果,決定以人造圓板狀顆粒(直徑15mm,厚度3mm)模擬岩塊材料(block),經由欲控制的體積比計算可得製作試體時所需層數和顆粒數,再利用『顆粒排列器』將圓板狀顆粒水平放置於每層基質泥(matrix)上,之後再鋪上所需基質泥並刮平,重覆上述步驟至試體所需高度。待試體養護完成後,利用不同角度鑽取,可得一系列不同傾角之混成岩試體。 根據立體量測學之觀念,利用旋轉式掃瞄器擷取試體表面影像,以影像處理法計算其岩塊材料之體積比,並與單位重法所得結果做一比較,由比較結果顯示影像處理法和單位重法皆具有可靠度,但影像處理法可大量縮短試驗時間且提供較佳之精度。 Melange - A mappable body of rock that includes fragments and blocks of all size, both exotic and native, embedded in a fragmented and generally sheared matrix, mechanical properties affected by heterogeneous and anisotropy. Melange is difficult to get sufficient amount from nature to do the experiment. In this research, artificial melange samples are made from nature rock materials (cement and kaolin) with different blending ratio for further use. First, the thesis initially uses FLAC program to analyze the influence by the scale effect of melange and bead size. According to the analyzing result, we decide to prepare artificial beads in the form of round-plate (diameter: 15mm, thickness: 3mm) to simulate the block. By knowing control volume proportion, we can calculate the number of layer and bead to make the sample. Next, we use bead lining-up machine to put the beads horizontally on each matrix, and then spread matrix on the beads to flatten the surface. Repeat the above steps until the sample reaches required height. After the sample is finished, melange specimen is drilled with various dip angles. And we can obtain melange with different inclined angles. According to the concept of stereology, rolling-scanner is used to get the surface image of the sample. By using Image process method, we calculate the volumetric block proportion of the enhanced material and compare the result obtained from Unit weight method. After the comparison, both methods are reliable, but Image process method can reduce great amount of experiment time and is more accurate than Unit weight method.
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