二维地电条件下充电法地形改正的一种方法   总被引：2，自引：0，他引：2  

戴光明  罗延钟 《物探化探计算技术》1997,19(1):36-40

本文首先讨论了充电法地形改正方法及存在的问题，提出了一种基于比值法思想的地改方法，经理论模型验算表明，有较好的地改效果  相似文献   

基于三对象多维标度法及其应用     

王自杰 《物探化探计算技术》1997,19(3):220-225

本文提供了基于三对象（样品或变量）的多维标度法。计算方案是通过一维标度求法（数量化理论Ⅳ的扩展）和多维标度求法把原始问题降至为标准特征值—特征向量问题来解决，该方法的主要目的是提取更多信息、简化数据结构并重新标度研究对象于新的低维空间，以便能通过二维“因子轴”来直接检验，它适合于定性和定量数据。编写计算程序进行标度分析，在内蒙古赤峰某金矿进行矿产预测应用效果良好。  相似文献   

三维任意形体高密度电阻率法数值模拟方法     

杨文强 《物探化探计算技术》1997,19(3):270-273,278

为研究高密度电阻率法对各种三维地电体的反映规律，本文介绍了正演程序编制的方法并给出了计算实例。  相似文献   

跨孔条件下椭球模型的视电阻率异常特征     

沙磊  蔡柏林 《煤田地质与勘探》1997,25(2):45-49

在跨孔条件下，利用积分方程法计算了孔区内外不同位置、不同产状的三维椭球体模型视电阻率异常。根据所得的典型数值模拟结果，借助视电阻率异常信息剖面图，对异常进行研究，总结了异常特征及其变化规律，并以此为基础分析和认识了其他模型的异常特征。  相似文献   

口泉沟南水源地环境同位素研究和水资源评价   总被引：3，自引：0，他引：3  

吴剑锋  费光灿 《煤田地质与勘探》1997,25(3):35-39

分析了大同矿区口泉沟南区的水文地质条件，利用氢，氧，铀，硫，碳等环境同位素研究了口泉南与相邻的泉域和三层洞泉域的关系及地下水的补给来源；用有限元法进行了地下水资源评价和水位预报，证明在该区建立供水１０＾４ｍ＾３的水源地是可能的。  相似文献   

焦作矿区电法探测导,含水构造的效果     

张萍芳  高建中 《煤田地质与勘探》1997,25(5):40-43

应用直流电法仪在井下进行了工作面巷道底板电测深和掘进头超前探测，查清了工作面底板水层的富水性和掘进头前头的地质构造及含水情况。目前，大部分探测结果已得到生产实践的证实。  相似文献   

Soil-structure interaction analysis of the Hualien containment model     

Todor Ganev  Fumio Yamazaki  Tsuneo Katayama  Teruyuki Ueshima 《Soil Dynamics and Earthquake Engineering》1997,16(7-8):459-470

This paper presents results from forced vibration tests, microtremor observations and earthquake response analysis of a nuclear reactor containment model constructed on stiff soil in Hualien, Taiwan. The dynamic behavior of the soil-structure system is simulated successfully with two numerical models: a sway-rocking model, whose soil parameters are evaluated on the basis of the continuum formulation method, and a finite element model, using the program SASSI with the flexible volume substructuring approach. The dependences of the soil parameters of both models on the amplitudes of the different dynamic excitations are investigated in detail. An original numerical simulation of microtremor is performed. Comparison with results of a previous study involving a rigid tower on a soft soil site in Chiba, Japan is offered.  相似文献   

The identifiability of parameters in a water quality model of the Biebrza River, Poland   总被引：1，自引：0，他引：1  

Marcel van der Perk  Marc F. P. Bierkens 《Journal of Hydrology》1997,200(1-4):307-322

The identifiability of model parameters of a steady state water quality model of the Biebrza River and the resulting variation in model results was examined by applying the Monte Carlo method which combines calibration, identifiability analysis, uncertainty analysis, and sensitivity analysis. The water quality model simulates the steady state concentration profiles of chloride, phosphate, ammonium, and nitrate as a function of distance along a river. The water quality model with the best combination of parameter values simulates the observed concentrations very well. However, the range of possible modelled concentrations obtained for other more or less equally eligible combinations of parameter values is rather wide. This range in model outcomes reflects possible errors in the model parameters. Discrepancies between the range in model outcomes and the validation data set are only caused by errors in model structure, or (measurement) errors in boundary conditions or input variables. In this sense the validation procedure is a test of model capability, where the effects of calibration errors are filtered out. It is concluded that, despite some slight deviations between model outcome and observations, the model is successful in simulating the spatial pattern of nutrient concentrations in the Biebrza River.  相似文献   

Predisposition to Induced Seismicity in Some Czech Coal Mines     

K. Holub 《Pure and Applied Geophysics》1997,150(3-4):435-450

—Mining-induced seismicity associated with longwall face operations in the Ostrava- Karviná coal mines, Czech Republic, has been investigated in order to establish the conditions leading to a focal zone generation. The study, based on macroseismic and instrumental observations, proved that seismicity is influenced by natural as well as mining conditions. The first group includes the influence of faults, washouts and red beds, while the second one is represented by shaft and/or crosscut safety pillars and various types of remnant pillars. All the cases discussed show that many focal zones are generated in overstressed strata as a consequence of interaction of natural conditions and/or old workings with the active coal face. Received June 18, 1996, accepted March 10, 1997  相似文献   

Numerical modeling of 3-D terrain effect on MT field   总被引：1，自引：0，他引：1  

Shizhe Xu  Baiyao Ruan  Hui Zhou  Leshou Chen  Shiwen Xu 《中国科学D辑(英文版)》1997,40(3):269-275

Using the boundary element method, the numerical modeling problem of three-dimensional terrain effect on magnetotelluric (MT) field is solved. This modeling technique can be run on PC in the case of adopting special net division. The result of modeling test for 2-D terrain by this modeling technique is basically coincident with that by 2-D modeling technique, but there is a great difference between the results of 3-D and 2-D modeling for 3-D terrain. Project supported by the National Natural Science Foundation of China.  相似文献