抛石防波堤人工护面块体强度模拟研究   总被引：1，自引：0，他引：1  

陈国平  胡智农  王红 《海洋工程》1995,(1)

本文主要研究了混凝土人工护面块体在模型试验中的强度模拟问题，根据不同比尺要求的强度指标，确定新型材料组成成份及其配比，并针对已有防波堤护面块体的破坏情况，进行了水槽模型验证试验。  相似文献   

Decomposition analysis on direct material input and dematerialization of mining cities in Northeast China     

Fangdao Qiu  Lianjun Tong  Huimin Zhang  Na Zhang 《中国地理科学(英文版)》2009,19(2):104-112

Material dematerialization is a basic approach to reduce the pressure on the resources and environment and to realize the sustainable development. The material flow analysis and decomposition method are used to calculate the direct material input (DMI) of 14 typical mining cities in Northeast China in 1995-2004 and to analyze the demateri-alization and its driving factors in the different types of mining cities oriented by coal, petroleum, metallurgy and multi-resources. The results are as follows: 1) from 1995 to 2006, the increase rates of the DMI and the material input intensity of mining cities declined following the order of multi-resources, metallurgy, coal, and petroleum cities, and the material utilizing efficiency did following the order of petroleum, coal, metallurgy, and multi-resources cities; 2) during the research period, all the kinds of mining cities were in the situation of weak sustainable development in most years; 3) the pressure on resources and environment in the multi-resources cities was the most serious; 4) the petro-leum cities showed the strong trend of sustainable development; and 5) in recent years, the driving function of eco-nomic development for material consuming has continuously strengthened and the controlling function of material utilizing efficiency for it has weakened. The key approaches to promote the development of circular economy of min-ing cities in Northeast China are put forward in the following aspects: 1) to strengthen the research and development of the technique of resources' cycling utilization, 2) to improve the utilizing efficiency of resources, and 3) to carry out the auditing system of resources utilization.  相似文献   

Prediction of uniaxial compression PFC3D model micro‐properties using artificial neural networks     

A. S. Tawadrous  D. DeGagné  M. Pierce  D. Mas Ivars 《国际地质力学数值与分析法杂志》2009,33(18):1953-1962

Artificial neural networks are used to predict the micro‐properties of particle flow code in three dimensions (PFC3D) models needed to reproduce macro‐properties of cylindrical rock samples in uniaxial compression tests. Data for the training and verification of the networks were obtained by running a large number of PFC3D models and observing the resulting macro‐properties. Four artificial networks based on two different architectures were used. The networks used different numbers of input parameters to predict the micro‐properties. Multi‐layer perceptron networks using Young's modulus, Poisson's ratio, uniaxial compressive strength, model particle resolution and the maximum‐to‐minimum particle ratio showed excellent performance in both training and verification. Adding one more variable—namely, minimum particle radius—showed degrading performance. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

哈尔滨市大地水准面精化的思路     

胡亚明  王建文 《测绘与空间地理信息》2009,32(1)

详细介绍了哈尔滨市大地水准面精化所采用的基础资料、精化思路以及精度检验方法.  相似文献   

免烧粉煤灰滤料的制备及其性能的研究     

付晓茹  黎飞虎  方华 《南京气象学院学报》2014,6(4):363-368

为了扩大粉煤灰的应用范围,减少其对环境的污染,并且寻求一种新的水处理滤料的配方与制备方法,以粉煤灰、粘土为主要原料,以生石灰、石膏、水泥为激发剂,以H₂O₂（双氧水）、NaHCO₃为发泡剂,经搅拌、成型、自然冷却等工艺在实验室制备了免烧粉煤灰滤料.结果表明,如果以孔隙率作为主要的性能评价指标,制备免烧粉煤灰滤料的最佳质量配比为：粉煤灰46.30%,粘土13.89%,生石灰18.52%,水泥13.89%,石膏1.85%,纯H₂O₂ 5.55%,此时所制滤料的孔隙率为72.24%.  相似文献   

东昆仑得尔龙地区华力西期花岗岩地质地球化学特征及构造环境分析     

徐国良  王成国  韩代成  孙业贞  曹海建 《山东国土资源》2014,30(12)

东昆仑得尔龙地区花岗岩体侵位于二叠纪—三叠纪早期,岩石类型为黑云母花岗闪长岩、黑云母二长花岗岩、二云母二长花岗岩。早期次的黑云母花岗闪长岩中含有暗色的镁铁质矿物包体。SiO2含量为65.04%~73.47%,全碱含量为5.29%~8.52%,K2O/Na2O平均值为0.70,Al2O3平均为14.79%;亏损高场强元素Ta,Nb;∑REE平均为142.9×10-6,轻稀土元素相对富集,(La/Yb)N平均为17.15,δEu平均为0.71,表现为弱亏损。研究表明得尔龙地区花岗岩属次铝-过铝(高钾)钙碱性S型花岗岩,形成于后造山环境;岩浆源区的物质是多源的,主要为地壳物质的重熔,其次为幔源岩浆的底侵。  相似文献   

福建平潭青峰老红砂物源示踪分析     

张红艳  俞鸣同 《福建地理》2014,(1):8-15

本研究分别在平潭青峰、坛南湾和闽江口琅岐岛采集18个老红砂样品、19个海滩砂样品以及40个河滩砂样品,并对这些样品进行粒度和稀土元素(REE)测量。结果发现老红砂与闽江口琅岐岛河口砂的稀土元素含量特征十分接近;分别对老红砂与闽江河口砂REE数据以及坛南湾海滩砂与闽江口砂(REE)进行了判别函数分析,老红砂的∑REE平均值为84.25μg/g,琅岐岛河口砂的∑REE平均值为89.81μg/g,相似性明显;坛南湾海滩砂的∑REE平均值为16.41μg/g,与闽江河口砂含量差别较大。研究表明:青峰老红砂沉积物主要来源于闽江口河口砂,末次间冰期暖湿气候下闽江输砂量增大,河口外沿岸流增强,大量河砂进入海坛海峡,在强劲的季风搬运下,沉积于平潭岛北部,形成以青峰为代表的平潭岛北部老红砂;而坛南湾海滩砂代表海洋波浪搬运的泥沙,不是老红砂的物源。  相似文献   

云南建水水草冲铜矿矿床地质特征及成矿物质来源          下载免费PDF全文

刘军港 《地质与勘探》2014,50(5):840-854

本文通过研究云南建水水草冲铜矿地质特征、围岩玄武岩和矿石矿物的微量元素、S、C、O同位素的组成,示踪了该矿床的成矿物质来源和性质。研究结果表明,云南建水水草冲铜矿位于滇东南哀牢山变质体北侧,容矿围岩为峨眉山玄武岩,矿体受北东向逆断层及其次级断裂控制,延深大于延长,形状不规则,矿体内多夹灰岩角砾及矿化玄武岩角砾,矿石矿物主要为黄铜矿,矿化蚀变以硅化、碳酸盐化、绿泥石化为主。水草冲铜矿黄铜矿与黄铁矿稀土元素具有相同的稀土元素组成与含量,ΣREE平均为1.901×l0-6,富集轻稀土元素,轻重稀土元素比(LREE/HREE)平均为8.188,（La/Yb）N值平均为10.259;δEu值平均为0.977;Ce呈现弱负异常,δCe值平均为0.808。黄铁矿中的Co/Ni比值为0.835,显示水草冲铜矿床为中温热液矿床;黄铁矿的Y/Ho比值平均为38.23,表明水草冲铜矿床的成矿流体为混合来源。结合黄铁矿的稀土微量元素特征,推断水草冲铜矿床的成矿流体是Cl多于F的流体。S的来源复杂,黄铁矿δ34SCDT（‰）的变化范围（18.3~29.4）与海水硫酸盐(海相蒸发岩)的δ34S值接近或略低;黄铜矿δ34SCDT（‰）变化范围是-0.5~10.1,表明有深部硫的参与。δ13C V-PDB（0.9‰~2.6‰）,δ18O V-SMOW（14.3‰~15.9‰）反映了方解石流体可能为热液循环萃取沉积岩地层混合形成。综上,推测成矿物质为后期构造热液萃取围岩（玄武岩和灰岩等）所得,其中铜主要来自于玄武岩本身,而硫的来源以地层硫为主。  相似文献   

大兴安岭北部甲乌拉铅锌银矿床Rb-Sr同位素测年及其地质意义   总被引：11，自引：3，他引：8  

李铁刚  武广  刘军  胡姸青  张云付  罗大峰 《岩石学报》2014,30(1):257-270

甲乌拉铅锌银矿床位于内蒙古自治区满洲里市南西150km。矿床产于中蒙古-额尔古纳兴凯造山带南东缘之得尔布干断裂北西侧。本文在甲乌拉矿床选取7件闪锌矿和6件黄铁矿样品开展了Rb-Sr定年。获得闪锌矿的Rb-Sr等时线年龄为143.0±2.0Ma(MSWD=3.2),锶同位素初始值I Sr=0.71265;黄铁矿的Rb-Sr等时线年龄为142.0±3.0Ma(MSWD=5.7),锶同位素初始值ISr=0.71267;闪锌矿与黄铁矿的Rb-Sr等时线年龄为142.7±1.3Ma(MSWD=3.8),锶同位素初始值ISr=0.71266。上述定年结果表明,甲乌拉矿床形成于早白垩世初期。甲乌拉矿床硫化物的Rb和Sr含量分别介于0.1034×10-6～7.367×10-6和1.301×10-6～7.148×10-6之间,Sr同位素初始比值(87Sr/86Sr)i介于0.71238～0.71277之间,平均值为0.71264,暗示甲乌拉矿床的成矿物质主要来源于地壳。甲乌拉矿床形成于蒙古-鄂霍茨克造山过程的后碰撞阶段。  相似文献   

磨抛光合成新材料在岩矿制片中的应用     

张树淮  郑杨  武育宁  明星  牛焕友 《华南地质与矿产》2014,(1):58-59

作者利用所研制出来的磨抛光合成新材料与传统磨抛光工艺进行了对比试验。通过对多种最常使用的矿物或岩石的反复试验,结果表明合成新材料不仅大大提高了工作效率,还具有抛光速度快(所需时间仅为传统工艺的1/3~1/2),而且抛光效果极佳(基本无糙面或麻点),经久耐用,耗材极低和基本无巴盘打片现象。  相似文献