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941.
This paper presents a review of recent developments made by the authors into the modelling of rock joints in direct shear. Careful observation of laboratory direct shear testing on concrete/rock joints containing two-dimensional roughness has allowed theoretical models of behaviour to be developed. The processes modelled include asperity sliding, asperity shearing, post-peak behaviour, asperity deformation and distribution of stresses on the joint interface. Model predictions compare extremely well with laboratory test results. These models were then applied to direct shear tests on rock/rock joints, and although behaviour in general was well predicted, the strength of rock/rock joints was over-predicted. Direct shear tests have also been carried out on samples containing both two- and three-dimensional roughness to test the accuracy of the two-dimensional approximation to roughness adopted in the theoretical models. 相似文献
942.
江西雅山花岗岩长石中磷的分布及意义 总被引:6,自引:0,他引:6
雅山富氟高磷花岗岩具较高的全岩磷含量(0.15%~0.55%),长石是磷的主要赋存矿物,磷以PAlSi-2替换方式进入长石结构中。各种结晶习性的长石的磷含量各不相同。早世代钠长石和雪球结构中钠长石包裹体的结晶较早,平均磷含量分别为0.18%和0.19%,而晚世代钠长石和环带钾长石中钠长石嵌晶的结晶稍晚,具较高的平均磷含量(分别为0.25%和0.23%)。钾长石的磷含量相对于钠长石总体上较低,早期结晶的雪球结构主晶钾长石和环带钾长石的磷含量最低,分别为0.04%和0.02%,晚期细粒钾长石的平均磷含量略高(0.19%)。长石对全岩磷的贡献率还与磷锂铝石等磷酸盐副矿物是否达到饱和有关,当无磷锂铝石结晶时,长石磷的贡献率约为76%,反之则约为31%。 相似文献
943.
944.
铁水预处理用鱼雷罐、铁水罐的炉衬多为Al2O3SiCC砖,随着铁水脱硫量的加大,耐火材料的侵蚀也较严重。而现在由于市场需要钢水中的磷含量要求较低,脱磷处理过程中由于国外多采用氧化铁系脱磷剂,氧化亚铁对石墨的氧化很大,对炉衬侵蚀也大,这就要求对Al2O3SiCC砖的性能进行改进以适宜工艺需要。国内对脱磷的研究较少,实际生产对铁水进行脱磷处理的厂家也很少。为探讨脱硫、磷剂对耐火材料的影响,本文对不同脱硫、磷剂侵蚀Al2O3SiCC砖后的残砖的显微结构进行了分析,探讨了铝碳化硅碳砖的侵蚀原… 相似文献
945.
原子荧光光谱法直接连续测定化探样品中的As Sb Bi Hg 总被引:7,自引:1,他引:6
研究了还原性介质中原子荧光光谱法直接连续测定化探样品中As、Sb、Bi、Hg的方法。按拟定的条件进行测定,各元素的检出限分别为As2.9×10-9、Sb1.3×10-10、Bi1.8×10-10、Hg5×10-11。应用于区域化探扫面工作中,效果良好。 相似文献
946.
Muscovite-2M1 shows a major phase transition at about 800°C, which is generally attributed in the literature to the structural dehydroxylation
process, although a number of structural models have been proposed for the dehydroxylated phase, and different transformation
mechanisms have also been put forward. The observed first order transformation involves an increase in the cell volume, and
it is not clear to date how the cell expansion is related to the loss of hydroxyl groups. The phase change has been re-investigated
here by in situ high temperature powder diffraction, both in non-isothermal and isothermal modes, to combine for the first
time the structural and the kinetic interpretation of the transformation. The results unequivocally confirm that the reaction
taking place in the temperature range 700–1000°C is truly a dehydroxylation process, involving the nucleation and growth of
the high temperature dehydroxylated phase, having Al in 5-fold coordination. Structural simulations of the basal peaks of
the powder diffraction patterns indicate that the model originally proposed by Udagawa et al. (1974) for the dehydroxylated
phase correctly describes the high temperature phase. The kinetic analysis of the isothermal data using an Avrami-type model
yields values for the reaction order compatible with a reaction mechanism limited by a monodimensional diffusion step. Apparent
activation energy of the process in vacuum is about 251 kJ/mol. Experiments carried out at temperatures much higher than the
onset temperature of the reaction show that the dehydroxylation reaction overlaps with the reaction of formation of mullite,
the final product in the reaction pathway.
Received: 24 April 1998 / Revised, accepted: 12 October 1998 相似文献
947.
胜利油田边缘及外围找寻不同类型深部天然气的可能性 总被引:9,自引:0,他引:9
笔者依据对前人资料和本人研究成果的综合分析,提出在胜利油田的边部碱性橄榄玄武岩发育地带找寻无机成因二氧化碳气藏和在油田外围金伯利角砾岩筒或含地幔岩包体的碱性玄武岩火山口附近找寻地球深部来源烃类气藏的建议。 相似文献
948.
949.
The sorption of AuCl4
−,AuCl2
− and Au(S2O3)3- on δ-MnO2 was investigated at pH2–11.6, 0.01 mol/L and 0.1 mol/L NaNO3 solutions. At pH 4 in two electrolyte strength solutions, Au sorption densities on δ-MnO2 are 0.18–0.21 and 0.28μmoL/m2 for AuCl4
− and Au(S2O3)2
3-, respectively, and the Au surface coverage is approximate to or lower than 1%. This adsorption of the two Au complexes decreases
as the solution pH increases, which conforms to the sorption regularity of the anion on δ-MnO2. The Au sorption decreases in the sequence of Au(S2O3)2
3- >AuCl4
− >AuC12
−. The intrinsic equilibrium constants (logK
int) of the three Au complexes are 1.17–2.7, much higher than those of Cu and Cd. The hydrolysis products of AuCl4
- are preferentially adsorbed by δ-MnO2 and the inner-sphere Au-surface complexes are formed on the surface.
Project supported by the National Studying-abroad Foundation, the National Natural Science Foundation of China (Grant No.
49573200) and the Australian Mining Industry. 相似文献
950.
数字地震仪(或雷达)的文件格式及其转换方法 总被引:3,自引:0,他引:3
详细介绍了SEG新规定的SEG-2标准及其文件结构,这一标准不但适用于数字地震仪,而且也适用于地质雷达等数字化记录设备。同时给出了一个在IBM-PC环境不读取SEG-2数据文件的C语言示范程序,根据这个示范程序,用户可以很方便地将SEG-2数据文件转换成适用于特定应用软件的数据格式。 相似文献