Study on the characteristics of rock failure strain and acoustic emission field for two parallelling faults with the same slip direction including asperities     

焦明若  张国民  马胜利  马宏生 《地震学报(英文版)》2002,15(4):374-382

Introduction Concerning about research on grouped-earthquake seismogenic and occurrence, at present it is only limited on the stage of the theoretical analysis and numerical model. For instance, ZHANG (1987) simulated the grouped-earthquake generation and physical mechanism making use of spring-block principle. Applying for non-linear dynamic model, referring to Chinese continental plate as object, LI, et al (1997) performed the numerical simulation on the seismogenic and occurring of group…  相似文献   

河南经济技术开发区发展前景与对策     

杨延哲  张教平  刘燕茹  杨文新 《地域研究与开发》2002,21(4):24-27

文章阐述了经济技术开发区在区域经济发展过程中的作用。根据河南省经济技术开发区的发展现状和存在的问题，分析了加入WTO后开发区所面临的机遇和挑战，并在此基础上从开发区环境营造，运行机制，筹资方式，产业发展，城市建设等方面提出了加快河南省经济技术开发区发展的对策。  相似文献   

长效钾肥产业化与农业可持续发展     

钱发军  赵凤兰  邓挺  刘夏茹  豆来平 《地域研究与开发》2003,22(2):67-69

我国钾肥需求量逐年增加，80％需要进口，但同时又有大量的低品位非水溶性钾矿资源没有利用，利用非水溶性钾矿生产长效钾肥既能缓解钾肥短缺的矛盾，又可以解决普通钾肥对环境的污染和破坏。长效钾肥原料分布广，生产和施用技术简单，成本低，易于推广普及形成产业化，其对农业可持续发展将会产生重要的促进作用。  相似文献   

天山1号冰川厚度和冰下地形探测与冰储量分析   总被引：12，自引：0，他引：12       下载免费PDF全文

孙波  何茂兵  张鹏  焦克勤  温家洪  李院生 《极地研究》2003,14(1):35-44

通过对天山乌鲁木齐河源 1号冰川的雷达回波探测 ,清晰地揭示出冰川底部冰 /岩界面的位置及其起伏变化特征 ,显示出雷达波对山地冰川良好的穿透能力和对冰下地形的高分辨能力 ,冰川雷达测厚的误差小于 1 .2 %。研究结果显示 ,1号冰川东支冰川平均厚度为 5 8.77m ,西支冰川平均厚度为 44.84m ,冰体厚度最大值发育于冰川中部趋于主流线位置。冰川冰储量计算表明 ,东支冰储量为 0 .0 5 1 868km3,西支冰储量为 0 .0 2 0 2 1 0km3。表面和底部地形有明显差异 ,主要因冰川动力过程对基岩强烈的地貌作用所致 ,意味着冰床的起伏地形对冰川浅层冰体的运动过程影响不显著。  相似文献   

中国地质公园地质背景浅析和世界地质公园建设   总被引：35，自引：3，他引：35  

赵逊  赵汀 《地质通报》2003,22(8):620-630

2000年以来，中国基于自身丰富的地质遗产资源和保护经验，正式分2批命名了44家国家地质公园，其分布和特征受地质构造背景和新构造运动的控制。地质遗迹的保护和开发产生了很好的社会、经济和环境效益，同时也为世界地质公园的申报创造了条件。  相似文献   

鞍山市西郊区水位预测   总被引：2，自引：0，他引：2  

焦玉玲  杨天行  王孝军 《世界地质》2003,22(1):73-76

根据鞍山市西郊区水文地质条件，建立了双层渗流二维平面系统的数学模型：应用Galerkin有限元法求解模型，从模型的计算结果可见该区观测点水位绝对误差较小，达到了规范要求的计算精度，同时，在此区内有一个大漏斗，在东南的铁西一带也有一个小漏斗。由于铁西一带是主要开采水源区，开采水量较大，所以漏斗逐渐向外扩大且水位有明显下降的趋势。这一变化规律与实际水位一致，说明计算水位基本上反映了实际水位空间变化的规律。因此根据模拟参数利用此模型对该地区进行了水位预测，共预测了四年的水位状况，并依据水位的预测结果对该区的水资源开发利用提出了合理建议。  相似文献   

Land subsidence caused by groundwater exploitation in Suzhou City,China   总被引：10，自引：2，他引：10  

Chongxi Chen  Shunping Pei  Jiu Jiao 《Hydrogeology Journal》2003,11(2):275-287

Suzhou City, located at the lower reaches of the Yangtze River in southeastern Jiangsu Province, is one of the few cities in China which suffer from severe ground settlement. A research project was carried out to investigate this problem. Geological and hydrogeological studies show that there is a multi-layered aquifer system with three distinct, soft mud layers of marine and lagoonal origins. An examination of historical records of groundwater extraction, water levels, and ground settlement shows that the ground subsidence is associated with the continuously increasing groundwater extraction in the deep, confined aquifer. It is believed that the consolidation of the soft mud layers, especially the third layer which is thick and close to the main pumped aquifer, contributes to the ground settlement. A three-dimensional finite difference numerical model representing the multi-layered aquifer system was developed to study the ground settlement in response to groundwater extraction. By calibrating the model with both the measured groundwater level and ground settlement, the aquifer parameters were estimated. The model outputs fit reasonably well with the observed results, which indicates that the numerical model can reproduce the dynamic processes of both groundwater flow and soil consolidation. The hydraulic conductivity of the third mud layer near the center of the ground settlement has been reduced by over 30% in the last 14 years. The gradual deterioration in the hydraulic conductivity of the mud may have significant adverse effect on the sustainable groundwater resource of the deep confined aquifer, since the recharge from the shallow aquifers through the mud layer is the only source of water to the deep aquifer. An analysis of the spatial distributions of groundwater drawdown and ground settlement shows that the area with maximum drawdown is not necessarily the area with maximum ground settlement due to the occurrence of the soft mud layer. A simple reallocation in pumping rates on the basis of the spatial distribution of the thick mud layer could significantly reduce the ground settlement. Electronic Publication  相似文献   

鄂尔多斯西南缘前陆盆地沉降和沉积过程模拟   总被引：17，自引：8，他引：17  

刘少峰  李思田 《地质学报》1996,70(1):12-22

本文将东祁东逆冲带与鄂尔多斯西南缘晚三叠世前陆盆地相结合，研究了逆冲带内部变形特征，前陆盆地中层序地层格架特征及其反映的盆缘构造性质和幕式逆作作用。  相似文献   

变差函数参数的计算   总被引：2，自引：0，他引：2  

矫希国 《地质论评》1997,43(6):658-663

为了求出地质统计学中变差函数理论模型的参数，首先把相应模型化成线性函数的形式，多面手应用线性方程组非负解的理论计算出它的参数。  相似文献   

GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDAN-HECHI METALLOGENETIC BELT, NORTHWEST GUANGXI   总被引：3，自引：0，他引：3  

GUANGXI CAI Minghai  LIANG Ting  WU Decheng  HUANG Huimin * 《大地构造与成矿学(英文版)》2004,28(2):128-141

The Nandan-Hechi metallogenetic belt is the most important tin-polymetallic producing district in China, and is the location of the Dachang super-large tin deposit. Based on the detailed field investigation and isotopic data, the stages of magmatic activity in the Nandan-Hechi metallogenetic belt have been lined out in this paper. Through the study about the geochemical characteristics of different granites, and by using ω(Al2O3)-ω(SiO2), ω(TFeO)/[ω(TFeO) ω(MgO)]-ω(SiO2), AFM, ACF and Rb-Yb Ta, Rb-Y Nb,Ta-Yb, Nb-Y discrimination diagrams in combination with regional geological setting analysis, the authors carried out analyses about the structural environment for the formation of the granites, and discussed the structural environment and dynamic setting for the large scale mineralization in this area. Our study indicates that the majority of the granites in Nandan-Hechi metallogenetic belt belong to the POG type,while the later stage alaskite belongs to the RRG CEUG type. The granites were formed at the stage of structural transformation from postorogenic phase to intraplate setting. But the major structural environment is characterized by steady regional extension. The formation age for the granites coincides with the time for this transformation, and this translation environment is favored for large-scale metallogenesis.  相似文献