边坡动力响应分析及应用研究

As a marginal subject, dynamic responses of slopes is not only an important problem of engineering geology (Geotechnical problem), but also of other subjects such as seismology, geophysics, seismic engineering and engineering seismic and so on. Owning to the gulf between different subjects, it is arduous to study dynamic responses of slopes and the study is far from ripeness. Studying on the dynamic responses of slopes is very important in theories as well as practices. Supported by hundreds of bibliographies, this paper systemically details the development process of this subject, introduces main means to analyze this subject, and then gives brief remarks to each means respectively. Engineering geology qualitative analysis is the base of slopes dynamic responses study. Because of complexity of geological conditions, engineering geology qualitative analysis is very important in slopes stability study, especially to rock slopes with complex engineering geology conditions. Based on research fruits of forerunners, this paper summarizes factors influencing slopes dynamic stability into five aspects as geology background, stratums, rock mass structure, and topography as well as hydrogeology condition. Based on rock mass structure controlling theory, engineering geology model of the slope is grouped into two typical classes, one is model with obvious controlling discontinuities, which includes horizontal bedded slope, bedding slope, anti-dip slope, slide as well as slope with base rock and weathered crust; the other is model without obvious controlling discontinuities, which includes homogeneous soil slope, joint rock mass slope. Study on slope failure mechanism under dynamic force, the paper concludes that there are two effects will appear in slope during strong earthquake, one is earthquake inertia force, the other is ultra pore pressure buildup. The two effects lead to failure of the slope. To different types of slope failure, the intensity of two effects acting on the slope is different too. To plastic flow failure, pore pressure buildup is dominant; to falling rock failure and toppling failure, earthquake inertia force is dominant in general. This paper briefly introduces the principle of Lagrangian element method. Through a lot of numerical simulations with FLAC3D, the paper comprehensively studies dynamic responses of slopes, and finds that: if the slope is low, displacement, velocity and acceleration are linear enlarging with elevation increasing in vertical direction; if the slope is high enough, displacement, velocity and acceleration are not linear with elevation any more, on the other hand, they fluctuate with certain rhythm. At the same time, the rhythm appears in the horizontal direction in the certain area near surface of the slope. The distribution form of isoline of displacement, velocity and acceleration in the section of the slope is remarkably affected by the slope angle. In the certain area near the slope surface, isoline of displacement, velocity and acceleration is parallel to the surface of the slope, in the mean time, the strike direction of the extreraum area is parallel to the surface of the slope too. Beyond this area, the isoline direction and the strike direction of the extremum area turn to horizontal with invariable distance. But the rhythm appearing or not has nothing to with the slope angle. The paper defines the high slope effect and the low slope effect of slopes dynamic responses, discusses the threshold height H^t of the dynamic high slope effect, and finds that AW is proportional to square root of the dynamic elastic moduli El P , at the same time, it is proportional to period Tof the dynamic input. Thus, the discriminant of H^t is achieved. The discriminant can tell us that to a slope, if its height is larger than one fifth of the wavelength, its response regular will be the dynamic high slope effect; on the other hand, its response regular will be the dynamic low slope effect. Based on these, the discriminant of different slopes taking on same response under the same dynamic input is put forward in this paper. At the same time, the paper studies distribution law of the rhythm extremum point of displacement, velocity and acceleration, and finds that there exists relationship of N = int among the slope height H, the number of the rhythm extremum VHlhro) point N and ffthre- Furthermore, the paper points out that if N^l, the response of the slope will be dynamic high slope effect; \fN

岩性不均一的灰岩风化壳发育特征--贵阳花溪剖面粒度分布特征的指示

通过贵阳花溪夹泥质薄层的灰岩风化壳剖面的粒度分布特征的研究，结合矿物成分分析，揭示出岩性不均一的灰岩风化壳的发育特征：灰岩作为剖面主体的成土母岩，风化早期，其以碳酸盐矿物的大量溶蚀及酸不溶物的残余积累为特征，同时方解石的溶解也延缓了酸不溶物的风化；后期，随着易溶盐类消失殆尽，酸不溶物作为风化主体，开始了类似其它岩类的风化过程。而灰岩中的泥质薄层夹层，作为风化壳的次要组分，在灰岩风化过程中，由于存在巨大的体积缩小变化，泥质薄层被错断并被灰岩的风化产物所包裹，延缓了其风化发育进程．于是，各端元组分由于所处的微环境的差异，受风化溶液的影响程度不同，按照各自的风化方向和演化方式进行。随着风化程度不断增强，泥质薄片的包裹体分解，端元组分逐渐混合、趋同，风化壳趋于均质化，以统一的风化成土作用向表生稳定的矿物转变。

洱海近代沉积物中碳—氮—硫—磷的地球化学记录

在＾２１０Ｐｂｅｘ和＾１３７Ｃs计年基础上，对采自洱海深水湖区沉积物柱芯进行了Ｃ ｉｎｏｒｇ（无机碳）、Ｃｏｒｇ（有机碳）、Ｎ、Ｓ含量和Ｐ开矿分析。Ｃｏｒｇ生趣剖面具“沉降－降解－堆积”三阶段分布特征，沉降和堆积通量分别为１２．７ｇ／（ｍ＾２．ａ）和７．２０ｇ／（ｍ＾２．ａ）；降解速率常数为０．０１７ａ＾－１，寄宿时间为４０a。Ｎ的生趣分布与Ｃｏｒｇ相似，沉降和堆积通量分别为２．６２ｇ／（ｍ＾２．Ａ

湘中锡矿山式锑矿锑与砷、金的共生分异现象

通过湘中锡矿山式锑矿矿化蚀变特征及矿化蚀变岩石微量元翥统计分析 阐述了成矿作用中锑与金、砷共生分异的现象，并以因子分析为手段，提取成矿作用中最主要的两个特征因子，综合地质分析，指出锑矿戚矿过程中主要包古有两种地质作用：硅化与锑矿化。硅化和锑矿化分别同砷、金富集和锑矿质沉淀析出相 联系，从而造成锑与金、砷共生分异。硅化作用主要在成矿早期，温度较高(200～300℃)，砷、金主要在这一阶段析出。锑矿化则集中发生在成矿作用晚期，温度较低(100～200℃)，辉锑矿以裂隙充填方式沉淀成矿对锑与金、砷共生分异的认识较好地解释了矿化带上成矿特征指示元素在元素聚类分析中不相关的矛盾。

吉林庥安铅锌矿地球化学与分散元素

吉林集安铅锌矿床是我国最早报道的少数几个典型低温铅锌矿床之一。矿化具有多期次特点，富矿体都是多期次矿化叠加的产物。根据矿化先后和矿物生成顺序将矿化分为五个阶段；①石英－黄铁矿矿化阶段；②重晶石－闪锌矿矿化阶段；③石英－方铅矿矿化阶段；④石英－黄铁矿矿化阶段；⑤碳酸盐－氧化矿物矿化阶段。用均一法和爆裂法测得石英、重晶石、闪锌矿包裹体成矿温度变化在110℃-197℃之间，矿床中除含铅锌矿外，还有微量的Pt和Pd，并普遍含分散元素Cd,Gs,Tl,In,Se,Ge,Te，其中以Cd含量最高，闪锌矿中Cd含量最高可达7155×10^-6。分散元素主要呈象形式赋存在各种矿物之中，未发现独立矿物。通过矿床地质和硫铅同位素研究表明该铅锌矿床属低温沉积－改造型层控矿床。

兰坪盆地白秧坪铜钴多金属矿床中钴的成矿地球化学

白秧坪铜钴多金属矿床产于下白垩统景星组陆相红色碎屑岩中，呈似层状、脉状分布于断裂带内，蚀变 分带明显。研究表明：在原生矿石中钴主要赋存于独立矿物．辉砷钴矿中，同时钴可以类质同象赋存于砷黝铜 矿及少量含钴黄铁矿中：在氧化矿石中，以钴华存在于矿石的表面。辉砷钴矿的成分和Co／Ni比值揭示钴的成 矿作用与基性．超基性岩浆有关。矿床褪色蚀变岩、碳酸盐化蚀变岩矿石和正常岩石具有类似的稀土元素配分 模式。即富集轻稀土而重稀土相对亏损、铈异常不明显而铕异常显著，但稀土元素总量、分异程度存在明显的 差异。这可能与流体中带入稀土元素的方式、带入稀土的矿物类型和流体性质的差异等因素造成，反映成矿物 质来源存在差异。相对正常岩石的微量元素含量，元素CIl、co、As、 、Bi、Ag等在褪色蚀变岩、碳酸盐化蚀变岩 和矿石中均相对富集，但在在褪色蚀变岩以亲石元素富集最明显，而在碳酸盐化蚀变岩和矿石中以显著富集 亲硫元素(成矿元素)为主特征，表明在蚀变过程中，赋矿围岩本身没有为成矿作用提供主成矿元素，主成矿元 素源自幔源的基性岩浆。由此认为钴的成矿作用可能主要与喜马拉雅期幔源的基性岩浆活动有关。

The study of oxygen spillover and back spillover on Pt/TiO2 by a potential dynamic sweep method

Oxygen spillover and back spillover on Pt/TiO2 catalysts have been studied by a potential dynamic sweep method. The characteristics of I-V profiles of Pt/TiO2 electrodes in the three potential sweep regions are different from those of Pt and TiO2 electrodes. The catalytic role of Pt/TiO2 in oxygen spillover and back spillover is identified. It decreases, and the electrochemical oxygen adsorption (or desorption) increases with elevating temperature of hydrogen post-treatment of Pt/TiO2; to a certain extent (hydrogen post-treatment of Pt/TiO2 at 700 degrees C), the control step of oxygen electrode process (anodic oxidation or cathodic reduction) changes from oxygen diffusion to electrochemical oxygen adsorption or desorption, respectively. Increasing the amount of Pt supported on TiO2 enhances the processes of oxygen spillover and back spillover. (C) 1999 Elsevier Science B.V. All rights reserved.

Análise da relação siringila : guaiacila por cromatografia gasosa acoplado a espectrometria de massa.

2010

Controle patrimonial (ativo imobilizado) da Embrapa Florestas.

2010