共查询到17条相似文献,搜索用时 62 毫秒
1.
黄土地区地裂缝、黄土暗穴及滑坡等不良地质缺陷,对公路的建设和安全运营构成了影响和威胁。利用电阻率法探测地质缺陷,有着良好的物性基础和探测依据。高密度电阻率法可以实现装置的灵活选择和数据的大覆盖采集,成为浅地表地质勘查的主要方法。本文在数值模拟、物理模拟及工程实践的工作基础上,分析了偶极—偶极、多重中间梯度和五极纵轴测深装置的探测效果。结果表明,不同装置类型有不同的分辨能力,激电信息有助于对地质缺陷的分辨,应用双频激电法可以同时获得高精度的地电阻率和激电信息,是探测地质缺陷的有效方法。 相似文献
2.
新疆金沙滩金矿普查区以往的物探资料相对缺乏,这与该区较为困难的接地条件有关。相对而言,双频激电法具有受电流变化影响小、抗干扰能力强等优点,对该类地区的物探找矿具有一定的适用性。文章主要阐述了双频激电中梯扫面和双频激电测深在新疆金沙滩金矿普查区的应用;并通过视幅频率的数据处理,综合分析双频激电中梯平面、剖面异常特征和双频激电测深断面特征,进一步明确找矿范围,查明矿(化)体的赋存部位、分布规模等,实现找矿目标。 相似文献
3.
4.
5.
6.
7.
8.
9.
10.
豫西董家埝银矿属于构造蚀变岩型银矿床,银矿体赋存于F1构造蚀变带中;为了解F1构造蚀变带在深部延伸情况和矿(化)体特征,依据岩(矿)石物理性质、矿床地质特征,采用大功率激电测深方法,激电测深断面反映了地下半空间内深部构造蚀变带和银矿(化)体引起的"中高阻、弱极化"异常特征,后经钻探工程验证,在F1构造蚀变带深部发现了品位较均匀、厚度较稳定的银矿体,银矿体Ag平均品位164.0×10-6,平均总厚度7.06 m,预期可提交(333)+(334)?银资源量1200 t。该矿床是豫西中元古界小河岩体南缘首次发现的银矿床,它的发现为矿区周边或类似成矿条件地区寻找银矿床提供了范例。 相似文献
11.
在水平或近水平层状地层条件下,直流电测深的视电阻率可以近似表述为离散形式。为了便于电测深的解释工作,本文采用最优化反演法。根据实测数据,给出初始模型参数即层数、各层电阻率和厚度,推导出电阻率转换函数,计算理论视电阻率值,直接拟合实测视电阻率,计算拟合程度。在MATLAB开发环境下设计了可视化程序,操作简便,人机交互良好,可以很好地实现正演理论模拟,同时可以实现反演过程,拟合曲线效果可以实时显示。应用表明,该反演程序可以得到良好的结果,拟合精度达到要求。 相似文献
12.
The paper presents the methodology used to estimate the base and thickness of the Trifa aquifer, north-east Morocco, from very limited drilling and geoelectrical sounding data. The methodology is applicable where the aquifer is a single horizon with considerable lateral variation. The procedure is based on geostatistical techniques: kriging of apparent resistivities, calibration of the resistivities with information from drilling, co-kriging of resistivities and estimation of the thickness of the aquifer by inverting the apparent resistivity formula. Calculated and measured substratum levels are obtained by subtracting the estimated and measured thickness from the topography at the drilling and geo-electrical sounding locations. By co-kriging the estimated substratum levels with the measured values in the drilling locations, a map of the substratum over the plain was prepared. 相似文献
13.
昌黎县九龙山是重要的铜银钼多金属矿采区,前人通过开展激电中梯面积性测量和化探异常查证工作,发现激电中梯成果与化探异常查证结果套合较好,推测高极化异常区是矿化富集的主要地段,但对深部情况难以预测。为进一步了解激电异常的垂向分布及变化情况,对高极化异常区进行激电测深剖面测量,并结合测深断面图成果和不同深度的Fs平面等值线图,识别下伏矿体空间展布形态并指导钻孔布设。经钻孔验证表明,深部见矿较好区域与高极化异常区吻合良好。综合分析认为,激发极化法对寻找铜银钼多金属矿是行之有效的,为今后在该区域寻找多金属矿提供了技术参考,也为下一步推进该区地质找矿工作有着积极的指导意义。 相似文献
14.
结合西北地区黄土滑坡的工程地质特点,介绍了一种新的电法勘探仪器及其方法——GDT高分辨地质探测仪和GDS高分辨率测深法,并结合工程实例,指出GDS高分辨率测深法的运用效果较好。 相似文献
15.
16.
17.
In the present paper, artificial neural network (ANN) modelling has been performed for evaluating power coefficient (Cp) and torque coefficient (Ct) of a combined three-bucket-Savonius and three-bladed-Darrieus vertical axis wind turbine rotor, which has got potential for power generation in a small-scale manner, especially in low wind speed conditions. However, detailed experimental work on the rotor for evaluating its performance parameters is either scarce or too costly and time consuming to carry out. In this work, a new ANN modelling method is adopted to map the input–output parameters using very small training data sets, selected from past experimental results of the rotor. The trained ANN models are used to predict the performance data, which are obtained within acceptable error limits. Furthermore, to evaluate the fit values and estimate the variance of the predicted data by the ANN models, linear regression equations are fitted to the experimental and predicted results, which shows that R-squared (R2) values are obtained close to unity meaning good fitting of the data. Moreover, the results of ANN modelling are also compared with that of radial basis function (RBF) networks, which also show a good agreement between ANN predicted data and RBF network data. The present ANN models can be exploited to extract more performance data within a given range of input data. 相似文献