A pulse in a binary sediment     

L. Neil Frazer 《Geophysical Journal International》1994,118(1):75-93

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软弱破碎围岩变形特性   总被引：4，自引：0，他引：4  

李守柱  黄鼎成 《工程地质学报》1993,1(1):74-84

本文在连续十余年原位监测试验资料的基础上,描述了全断面开挖的软弱围岩变形u-t全过程曲线;阐明了不同变形阶段的变形速率、变形量以及这些变形的时空效应;探讨了岩体工程地质特性、埋深、洞径、开挖方式和支护及时性等主要因素对围岩变形特性的影响;并针对具体工程提出了围岩稳定性状态划分及其判别标准、失稳险情预报原则、变形控制标准与初期支护抗力的确定原则、后期支护最佳施作时期的选择以及合理开挖方式。  相似文献   

随机信号过程与矿床产出模型导出     

徐仲平 《新疆地质》1993,(4)

将一个矿床的产出抽象化为一个随机信号的发生,由此导出一递推微分方程组,解之得普阿松分布。证明矿床的产出过程是一个普阿松过程,进而用Γ—分布表述了其参数λ,引出了负二项分布,给出了一个完整的推导过程。  相似文献   

On the estimation of the generalized covariance function   总被引：1，自引：0，他引：1  

T. H. Starks  J. H. Fang 《Mathematical Geology》1982,14(1):57-64

The estimation of the generalized covariance function, K, is a major problem in the use of intrinsic random functions of order k to obtain kriging estimates. The precise estimation by least-squares regression of the parameters in polynomial models for K is made difficult by the nature of the distribution of the dependent variable and the multicollinearity of the independent variables.  相似文献   

预应力约束下装配式剪力墙结构减震性能研究          下载免费PDF全文

尹新生  刘晓巍 《地震工程学报》2020,42(1):1-6

为了应对中国在新时期提出的“经济,适用,绿色,美观”的建筑政策,装配式结构逐渐成为近年来关注的焦点.对比传统现浇结构,装配式结构更符合节能、节材、环保等要求.因此,进一步研究装配式结构的抗震性能是非常重要的.考虑现有装配式剪力墙结构节点连接部位存在湿作业、施工难度大,常常出现强构件弱节点,抗震性能有待进一步深入研究等情况.为此我们提出一种新的结构形式———预应力约束下装配式剪力墙结构,该结构通过预应力筋连接结构的墙、板,使结构形成一个整体,减少施工现场湿作业,施工质量得以提高.当地震发生时结构通过改变自身的刚度,使其自震周期增大,达到减小地震应力的目的,同时很多提高延性因素的条件也无需考虑,避免钢材的浪费.通过对现浇剪力墙结构模型和预应力约束下装配式剪力墙结构模型进行时程分析,计算结果表明:与现浇剪力墙结构相比,预应力约束下装配式剪力墙结构可减小90%的地震作用,减震效果显著.  相似文献   

结构面粗糙度统计测量最小样本数确定方法     

侯钦宽  雍睿  杜时贵  徐敏娜  曹泽敏 《岩土力学》2020,41(4):1259-1269

由于结构面粗糙度具有各质异性、各向异性、非均一性和尺寸效应等特征，结构面粗糙度系数（JRC）取值具有不确定性，工程中广泛采用统计方法来分析结构面粗糙度性质，然而以往研究往往忽略样本数不足对统计结果的影响。针对结构面粗糙度统计测量时无法确定合理样本数的问题，分别提出基于变异系数级比分析及简单随机抽样原理的最小样本数确定方法。以实际工程岩体结构面表面数据为研究对象，对比分析两种方法在系列尺寸下确定的统计测量最小样本数。实例分析表明：小尺寸样本的变异系数（CV）值明显大于大尺寸样本，且CV值随取样尺寸的增大而减小，取样尺寸为10～50 cm的CV值基本稳定在0.31～0.47之间，取样尺寸为60～100 cm的CV值基本稳定在0.21～0.31之间；最小样本数与取样尺寸基本满足幂函数关系，且最小样本数随取样尺寸的增大而减少；系列尺寸下级比分析方法在允许误差为±2%时确定的最小样本数与简单随机抽样原理在最大允许误差为10%、置信度为95%时计算的最小样本数是一致的，相似度大于0.997。该研究方法可为工程岩体中定量获取结构面粗糙度统计测量最小样本数提供依据，保证了JRC（结构面粗糙度系数）统计测量结果的准确性，对工程岩体稳定性评价中结构面力学参数的准确获取具有重要意义。  相似文献   

Geostatistical method to delineate anomalies of multi-scale spatial variation in hydrogeological changes due to the ChiChi earthquake in the ChouShui River alluvial fan in Taiwan   总被引：1，自引：0，他引：1  

Yun-Bin?Lin  Yih-Chi?Tan  Yu-Pin?LinEmail author  Chen-Wuing?Liu  Chien-Jen?Hung 《Environmental Geology》2004,47(1):102-118

This study uses Ordinary Kriging (OK), Sequential Gaussian Simulation (SGS) and Simulated Annealing Simulation (SAS) to relocate the completely heterotopic dataset from the locations of the Standardized Satellite Oriented Control Point System (SSOCPS) stations to the Groundwater Monitoring Networks (GMNS) stations and factorial kriging to analyze and map relationships among seven variables, including the hydraulic conductivities of three aquifers, the vertical displacements of the ground and groundwater level changes in the wells of three aquifers, and also to delineate the anomalies of multi-scale spatial variation of hydrogeological properties associated with the ChiChi earthquake, measuring 7.3 on the Richter scale, in the ChouShui River alluvial fan in Taiwan. In this study, the anomalies of spatial variation of hydrogeological properties associated with the earthquake are illustrated at micro, local and regional scales of 9, 12 and 36 km, respectively. In the study area, regionalization components associated with variation at local and regional scales are obtained and mapped by factorial kriging. Factorial Kriging Analysis (FKA) also demonstrated that the main effects of the ChiChi earthquake on the spatial variations of groundwater hydrological changes include porous media compression at micro scale, hydrogeological heterogeneousness of the sediments within the aquifer at local scale and the cyclic loading of deviatoric stress at regional scale. Finally, maps of spatial variations of regional components fully depicted all of the anomalies of spatial variation of hydrogeological changes due to the ChiChi earthquake and can be used to identify, confirm and monitor the hydrogeological properties in this study area.  相似文献   

Application of geostatistics and GIS technique to characterize spatial variabilities of bioavailable micronutrients in paddy soils   总被引：6，自引：1，他引：5  

X.?M.?Liu  J.?M.?XuEmail author  M.?K.?Zhang  J.?H.?Huang  J.?C.?Shi  X.?F.?Yu 《Environmental Geology》2004,46(2):189-194

To understand the spatial dependency of bioavailable micronutrients in paddy soils, 134 soil samples were taken from Pinghu County, Zhejiang Province, south-east China to characterize the spatial variabilities of bioavailable Cu, Zn, Fe, and Mn. The geostatistics and geographic information system (GIS) techniques were applied. Bioavailable Zn and Mn were fitted to an exponential model with a range of 4.4 km and 2.97 km, respectively. Bioavailable Fe was fitted to the linear model with the longest range of 23.48 km. Bioavailable Cu did not show any spatial correlation with the fitted pure nugget effect model. Bioavailable Zn and Mn had strong spatial dependence due to the effects of intrinsic factors such as parent material, relief and soil types. Bioavailable Fe had moderate spatial dependence over a long distance. The spatial distribution of the four bioavailable micronutrients were significantly correlated to the soil formation factors. Human activity, such as application of fertilizer and pesticide, emission of waste gas and industrial pollution also had significant effects on the spatial distributions of the bioavailable micronutrients.  相似文献   

地震活动涨落、自组织结构和大震临界状态的统计特征   总被引：3，自引：2，他引：1  

罗灼礼  孟国杰  王伟君  罗伟 《地震》2004,24(4):1-15

根据非线性动力学理论、运用概率论与数理统计方法,对非平衡地震发生系统的空间分布状态进行了研究。提出用空间变异系数δV判断涨落类型:凝聚集、群集、泊松型和均匀点阵分布。从整体观点综合应用各统计量即协方差μ11、非负量I(x,y)、联合信息熵H(x,y)、离散度σ和δV,对非平衡系统的群体空间自组织结构和临界状态的统计特征做了进一步的探讨。根据首都圈公元前231年～2003年M≥434地震活动及其和华北不同范围ML≥3.0地震活动涨落的统计分析认为,μ11≈0,I(x,y)>0,高H(x,y)值,低σ和δV值是强震和大震发生的自组织空间结构和临界现象的基本特征和必要条件。同时对地震空区、条带、前兆性震群及前震等前兆现象成因提出了新的观点和统计解释,并得出结论:仅当一个远离平衡态的系统(区域)有足够的随机性而又非泊松型涨落时,系统的突变(大震)是不可逆转的。  相似文献   

A Web-based environmental decision support system (WEDSS) for environmental planning and watershed management   总被引：1，自引：0，他引：1  

Ramanathan?SugumaranEmail author  James C.?Meyer  Jim?Davis 《Journal of Geographical Systems》2004,6(3):307-322

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