未来上海地区海平面上升对土压缩模量的影响分析     

杨红禹  田春德 《水文地质工程地质》2001,28(2):25-27

未来上海地区海平面上升将引起地下水位抬升，将会对土压缩模量E产生影响，Es是土的最重要的物理力学参数指标之一，尤其在地基沉降计算中具有重要意义。本文主要针对土压缩模量Es的预测分析工作，进行了地基变形的;探讨研究，供交流参考。  相似文献   

Research on Practicability and Feasibility for a New-Type Tuned Mass Damper System-TMD     

Zhang Yaoting Lei Ping''''an Liu Zaihua Lin Ning Department of Civil Engineering  Huazhong University of Science  Technology  Wuhan 《中国地质大学学报(英文版)》2001,12(4)

lNTRODUCTIONThe theories and applications of structural contr()l tlcveloped rapidly in the last 20 years. As one of the additiona1 I)asslve control technologY' TMD is used in practice and can suppress the vibration caused by wind or machinery shake (Ayorinde and Warburton, 1980; Den Hartog, l956 ). The TMDsystem has been used in the industrial and civil buildlngs t() rc-duce structural vibration in some European and American ()o[lntries (Ayorinde and Warburton, l980; Warburton. ] f)…  相似文献   

高村井水位潮汐参数的动态特征及其对大同地震的前兆响应   总被引：2，自引：0，他引：2  

唐九安  简春林 《地震》1996,16(3):277-283

介绍了高村（京１４）井１９８３－１９９０年的观测结果，分析该井水位及潮汐参数的动态特征、气压对观测结果的影响，讨论了Ｍ２波潮汐因子对１９８９年大同地震的前兆响应。  相似文献   

川滇强震的回归—马尔可夫链联合预测     

张启明 《四川地震》1993,(1):40-43

本文应用回归—马尔可夫链联合预测地震的方法,结合川、滇强震的特点,对川、滇强震进行了计算,并作了预测验证。结果表明,该方法对川、滇强震的预测效果较好。  相似文献   

Stratigraphic analysis and the asymptotic distribution of the coefficient of cross-association     

Miloslav Nosal  Jan Vrbik 《Mathematical Geology》1982,14(1):11-36

The asymptotic distribution of the coefficient of cross-association between two sequences of nominal data is investigated under the assumption of independent random sampling from a multinomial distribution slightly modified to suit geological applications. This modification is due to merging consecutive strata of the same rock type into one lithological unit, and can be described by a simple Markov chain. A distinction is made between the case in which the theoretical frequencies are known, and the situation where these have to be estimated from the observed data.  相似文献   

Water isotopic and hydrochemical evolution of a lake chain in the northern Great Plains and its paleoclimatic implications   总被引：2，自引：2，他引：0  

Zicheng Yu  Emi Ito  Daniel R. Engstrom 《Journal of Paleolimnology》2002,28(2):207-217

Oxygen isotopes and geochemistry from lake sediments are commonly used as proxies of past hydrologic and climatic conditions, but the importance of present-day hydrologic processes in controlling these proxies are sometimes not well established and understood. Here we use present-day hydrochemical data from 13 lakes in a hydrologically connected lake chain in the northern Great Plains (NGP) to investigate isotopic and solute evolution along a hydrologic gradient. The ¹⁸O and ²H of water from the chain of lakes, when plotted in ²H - ¹⁸O space, form a line with a slope of 5.9, indicating that these waters fall on an evaporation trend. However, 10 of the 13 lakes are isotopically similar (¹⁸O = –6 ± 1 VSMOW) and show no correlation with salinity (which ranges from 1 to 65). The lack of correlation implies that the isotopic composition of various source waters rather than in-lake evaporation is the main control of the ¹⁸O of the lakes. Groundwater, an important input in the water budget of this chain of lakes, has a lower ¹⁸O value (–16.7 in 1998) than that of mean annual precipitation (–11) owing to selective recharge from snow melt. For the lakes in this chain with salinity < 15, the water Mg/Ca ratios are strongly correlated with salinity, whereas Sr/Ca is not. The poor correlation between Sr/Ca and salinity results from uptake of Sr by endogenic aragonite. These new results indicate that ¹⁸O records may not be interpreted simply in term of climate in the NGP, and that local hydrology needs to be adequately investigated before a meaningful interpretation of sedimentary records can be reached.  相似文献   

Energy approach for earthquake induced slope failure evaluation     

T. Kokusho  T. Ishizawa 《Soil Dynamics and Earthquake Engineering》2006,26(2-4):221-230

Earthquake-induced slope stability is evaluated by the force-equilibrium method in engineering practice. This method provides a safety factor against initiating failure or displacement according to the Newmark model along a fixed slip surface but it cannot evaluate failure deformations after failure occurs. An energy approach is proposed as an alternative means for evaluating slope failures and subsequent flow deformations. The driving energy for slope displacement is considered to be the earthquake energy and the gravitational potential energy. As a first step in the research, an energy balance is formulated for the model of a rigid block resting on an inclined plane. Then, an innovative model test is developed, in which the energy balance in a sliding slope is measured on a shake table. The earthquake energy used for the slope failure can be successfully quantified in the test and its contribution to displacement is discussed in the light of the energy balance established for the block model.  相似文献   

线与线之间的空间拓扑关系组合推理   总被引：4，自引：0，他引：4  

郭庆胜  刘小利  陈宇箭 《武汉大学学报(信息科学版)》2006,31(1):39-42

在空间拓扑关系组合描述的基础上，进一步完善了利用基本空间拓扑关系进行组合推理的方法。并建立了组合表。详细绘制了两条线之间的空间拓扑关系图。  相似文献   

地球物理灾害链有关物理问题的讨论   总被引：1，自引：2，他引：1  

郭安宁  张惠芳 《气象与减灾研究》2006,29(4):40-43

对地球物理灾害链的致灾机理,地震引起的放气范围、放气时间过程的计算方法,以及地气耦合致灾模式,进行了讨论和分析。分析结果认为,巨灾大都是多种因素迭加和强化的结果。由于单学科往往提出的致灾因素有限,所以预测效果不甚理想。要多学科从多种因素上去研究,才能改进大灾预测手段和方法,最后达到灾害链全链预测的目的。  相似文献   

核筒悬挂结构三道抗震防线时程分析设计方法   总被引：2，自引：0，他引：2  

周坚  伍孝波 《世界地震工程》2006,22(1):49-56

提出了高层建筑核筒式悬挂结构三道抗震防线的时程分析设计计算方法,并编制了相应的计算程序Hangsys。计算结果与核筒悬挂结构模拟地震振动台试验的结果符合较好。因此,核筒悬挂结构完全可以通过精心设计使该类结构具有多道抗震防线,使悬挂结构既具有安全性又具有适用性。  相似文献