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Proof of settlement-time curve appearing “S” shape with ramp load
and its application base on stress-strain relationship 总被引：1，自引：0，他引：1
Based on stress-strain relationship of soil, the proof is made for that s-t curve appears “S” shape when the load is increased linearly, which is similar to construction process. A new model of forecasting the relation of settlement-time is presented. Case history shows the rationality of the method. 相似文献
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从更广泛和较高的层次对地质时期地球表层的生命活动和环境变化进行多学科的综合性研究，在全球系统分析的基础上为“协调人类与自然关系”的战略主题提供决策依据。以高分辨率地层学框架的研究的基础，综合多种学科对事件、间事件及其载体和介质的定量研究，为生物与环境的耦合机制的认识及有关模式的建立提供科学依据。化石燃料作为事件产物，其分布规律亦为重要研究内容之一。 相似文献
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五大连池近代火山老黑山火烧山火山喷发过程的考察研究 总被引：4，自引：0，他引：4
作者在已有工作的基础上,以当代火山学的研究思路和观点,为恢复五大连池两个近代火山,老黑山火烧山的喷发历史过程进行了野外考察研究工作。老黑山火山锥是由三套不同的碎屑堆积物组成。在锥体的南侧、东侧和西侧以及北测和北西侧有５个熔岩溢出口,按它们形成先后关系,认为有早、中、晚三期熔岩流。本文还对老黑山火山锥上的寄生火山、结壳熔岩与渣状熔岩的分布、流动特点及形成的控制因素进行了分析讨论。最后得出结论：老黑山火山是经多期次喷发活动形成的。火烧山火山锥是一碎屑化泡沫化程度很低的浮岩块和熔岩碎块组成,同老黑山有明显区别。 相似文献
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通过系统采集紫金山铜金矿床4~11线共41个钻孔的岩矿样,绘制原生晕剖面图,建立垂向元素分带序列、矿体剥蚀程度准则,结合深部指示元素的特征,进行隐伏矿预测。该矿床金矿近矿晕为Au-Ag-Zn1,尾部晕为BiGa-Mo-Sn-Ti-Co-Ni-W1-V;铜矿前缘晕为Hg-Sb-As,近矿晕为Cu-Pb1-Zn2,尾部晕为Be-W2。矿体剥蚀程度评价表明,高硫型铜矿体往深部已尖灭。深部F-Mn-Pb2-Zn3的异常形态和元素组合符合典型斑岩矿床的外带特征,斑岩体延伸至矿床周边;深部的蚀变矿物组合、金属矿物组合、流体包裹体特征等均表明深部可能存在斑岩铜(钼)矿床。 相似文献
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Chronostratigraphic Subdivision and Correlation of the Permian in China 总被引：11，自引：0，他引：11
JIN Yugan SHANG Qinghau WANG Xiangdong WANG Yue SHENG Jinzhang Nanjing Institute of Geology & Palaeontology Chinese Academy of Sciences Nanjing 《《地质学报》英文版》1999,73(2):127-138
Since the principle of multiple stratigraphic classification has been widely accepted by Chinese stratigraphers, various new Permian chronostratigraphic units have been proposed in China, and they need to be redefined. The establishment of a new global chronostratigraphic scheme of the Permian, compilation of Permian lithostratigraphic units and updating of Permian biostratigraphic sequences of China makes it possible to present a revised regional chronostratigraphic succession for the Permian System in China. This succession consists of three series and eight stages. The Chuanshanian Series includes two stages, the Zisongian and the Longlinian; the Yanghsinian (Yangxinian) Series is subdivided into the Chihsian (Qixiaan) and the Maokouan Subseries, of which the former comprises the Luodianian and the Xiangboan Stage, and the latter the Kufengian (Gufengian) and the Lengwuan Stage; the Lopingian (Lepingian) Series includes the Wuchiapingian (Wujiapingian) and the Changhsingian (Changxingian) Stage. 相似文献
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A scheme is proposed for predicting NINO-region SST in terms of a generalized canonical mixedregression model based on principal component canonical correlation analysis(PC-CCA). and into the scheme are introduced such techniques as EEOF, PRESS criterion and consensus prediction. By optimizing physicalfactors and selecting optimal model parameters, experiments were made successful in predicting the LINO SST index for 1 to 4 seasons to follow. The scheme is shown to be stable in operation and its total technical level compares well with that of the model published in NOAA/NWS/NCEP CPC Climate Diagnostics Bulletin. butthe number of factors needed in our scheme is much fewer than that for the CPC's model in dealing with the sameproblems. This makes it possible to establish an operational ENSO monitoring system in China. 相似文献
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文克尔地基模型的最大缺陷是没有考虑地基土的非线性和连续性。利夫金模型虽然对其连续性进行了改进,但过分考虑了基础形状对基床系数的影响,还导致了在矩形基础长短边方向上基床系数的极不对称。为此提出非线性广义文克尔模型,对文克尔模型特征函数重新进行了定义,修正了利夫金模型的缺点,在合理考虑基础形状和尺寸对地基刚度影响的同时,还能分别模拟几种典型情况的反力分布形式。非线性广义文克尔模型还通过分段线性逼近实际p-s曲线的方法,考虑了地基土的非线性。算例分析表明,非线性广义文克尔模型具有一定的合理性和实用性。 相似文献
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