华南大花岗岩省及其与钨锡多金属区域成矿系列

为揭示与华南大花岗岩省及其与钨锡多金属区域成矿系列的特征,特提出与成矿作用有关的深部构造-岩浆过程和表壳的岩浆-构造动力作用及其形成侵入接触构造体系的控矿模型。据此控矿构造模型列述了南岭钨锡多金属区域成矿的陆缘-陆内造山的构造岩浆作用过程形成的三大成矿系列。最后提出深部构造过程与表壳控矿最佳耦合以及岩浆冷速率、热效应与最佳成矿机制问题。     

珍珠白花岗石中多种微量元素的ICP-AES同时测定的研究

研究了微波制样，用ICP-AES法同时测定珍珠白样品中Mg、Al、Fe、Pb、Cr、Ni、Mn、As八种微量元素的新方法。方法的检出限为0．002～0．036μg／mL，回收率为92．8％～107．6％．RSD小于3．19％。该法准确、快速、简便，应用于花岗石的测定，结果满意。     

Conversion of a digital camera into a non-contact colorimeter for use in stone cultural heritage: The application case to Spanish granites

In this study, a digital CMOS camera was calibrated for use as a non-contact colorimeter for measuring the color of granite artworks. The low chroma values of the granite, which yield similar stimulation of the three color channels of the camera, proved to be the most challenging aspect of the task. The appropriate parameters for converting the device-dependent RGB color space into a device-independent color space were established. For this purpose, the color of a large number of Munsell samples (corresponding to the previously defined color gamut of granite) was measured with a digital camera and with a spectrophotometer (reference instrument). The color data were then compared using the CIELAB color formulae. The best correlations between measurements were obtained when the camera works to 10-bits and the spectrophotometric measures in SCI mode. Finally, the calibrated instrument was used successfully to measure the color of six commercial varieties of Spanish granite.     

凝灰岩一次烧结仿花岗岩釉面泡沫陶瓷保温装饰材料的研究

以凝灰岩为主要原料,加入发泡剂、助溶剂等形成发泡保温层(上层),以微晶玻璃颗粒为釉面层(下层),在1050～1100℃发泡、熔融,一次烧结形成仿花岗岩、大理石釉面泡沫陶瓷保温、装饰材料,具有保温装饰双重功能。发泡保温层密度为300～500㎏/m3、导热系数为0.7～0.12W/m·K、抗压强度为5～10MPa,釉面层装饰效果独特,可与花岗岩、大理石相媲美。可用于建筑物内外墙、公园建筑小品等的保温与装饰,为凝灰岩资源的合理开发利用开辟了新途径。     

Effect of cementation on the small-strain stiffness of granite residual soil

It is widely acknowledged that residual and sedimentary soils differ considerably because of how they formed. However, despite extensive advances regarding sedimentary soil, little is known about the small-strain stiffness of residual soil. This paper concerns granite residual soil from Xiamen in China, for which a typical profile is established by in situ investigations. How the stiffness varies with the soil current state, including effective mean stress, void ratio and strain, is established via systematic resonant-column tests on high-quality undisturbed and remolded specimens. Highlighted are the unique properties of the studied soil and how they affect the soil stiffness. It is found that cementation among soil particles plays a critical role in the soil stiffness. Although some existing methods can confirm the existence of cementation in the studied soil, they cannot quantify it. Therefore, a new parameter R_n is proposed to quantify the degree of cementation, with lower R_n corresponding to a more cemented structure. According to the proposed R_n, the studied residual soil in Xiamen has a different degree of cementation from that of some well-studied weathered materials, thereby necessitating separate characterization of this soil. This study improves the understanding of residual soil stiffness at small strain, especially the key effect of cementation in natural soil.     

哈萨克斯坦ОЙМАША-36井极硬地层小井眼取心技术应用

ОЙМАША-36井是哈萨克斯坦阿克套州奥依玛沙油田的一口重点评价井,其目的层PZ地层,岩性为胶结致密的花岗岩,地层极硬钻进难度大,该层位裂缝发育,在该地层取心机械钻速慢,割心容易滑脱,取心难度大。分析哈萨克斯坦奥依玛沙油田ОЙМАША-36井的地层特点,通过优化取心参数、优选取心钻头及现场实验、成功的完成了小井眼钻井取心任务,为阿克套州奥依玛沙油田的产能建设和地层资料,提供有效的数据。     

Mechanical Response and Energy Dissipation Analysis of Heat-Treated Granite Under Repeated Impact Loading

The mechanical behaviors and energy dissipation characteristics of heat-treated granite were investigated under repeated impact loading. The granite samples were firstly heat-treated at the temperature of 20°C, 200°C, 400°C, and 600°C, respectively. The thermal damage characteristics of these samples were then observed and measured before impact tests. Dynamic impact compression tests finally were carried out using a modified split-Hopkinson pressure bar under three impact velocities of 12 m/s, 15 m/s, and 18 m/s. These test results show that the mineral composition and the main oxides of the granite do not change with these treatment temperatures. The number of microcracks and microvoids decreases in the sample after 200°C treatment. The mechanical properties of a sample after 600°C treatment were rapidly deteriorated under the same impact velocity. The average of peak stress is much smaller than those after 20°C, 200°C and 400°C treatments. The heat-treated samples have an energy threshold each. When the dissipated energy of a sample under a single impact is less than this threshold, the repeated impacts hardly lead to further damage accumulation even if its total breakage energy dissipation (BED) density is large. Under the same number of repeated impacts, the cumulative BED density of a sample after 600°C treatment is the largest and its damage evolves most quickly. The total BED density of the sample after 200°C treatment is the highest, which implies that this sample has better resistance to repeated impact, thus having less crack initiation and growth.     

川西大渡河中游花岗石矿产地质特征及开发前景

本文介绍大渡河中游东岸大相岭、二郎山、黄草山红色饰面花岗石矿产地质特征,开发前景及建议。     

硅烷偶联剂溶液改性花岗岩粗骨料混凝土的抗压强度

探讨硅烷偶联剂溶液浓度及其浸泡花岗岩粗骨料的时间对混凝土抗压强度的影响。结果表明,0.5%浓度的偶联剂溶液和15 min 的骨料浸泡时间使混凝土强度提高幅度最大。为研发中等强度、耐久性良好的混凝土提供了一条新线索。     

地铁盾构施工遇花岗岩风化球的处理对策及关键技术

根据深圳地区地铁盾构法隧道的施工实践,探讨了盾构施工遇花岗岩风化球处理的对策及关键技术。