Reliability analysis method applied in slope stability： slope prediction and forecast on stability analysis     

Wenjuan ZHANG Li CHEN Ning QU Hai＇ an LIANG 《东北亚地学研究》2006,9(2):239-241

Landslide is one kind of geologic hazards that often happens all over the world.It brings huge losses to human life and property;therefore,it is very important to research it.This study focused in combination between single and regional landslide,traditional slope stability analysis method and reliability analysis method.Meanwhile,methods of prediction of slopes and reliability analysis were discussed.  相似文献   

西宁市南川水源地水质恶化机制     

李玉军 《青海国土经略》1996,(2)

地下水动态长期监测资料证实,由于受潜水面天然坡度和含水层底板坡度的影响,水源地开采所形成的降落漏斗中心被下移到开采井区下边界附近,且为偏态漏斗。水质恶化的原因是由于开采过量造成。  相似文献   

全球卫星导航系统的进展   总被引：5，自引：1，他引：4  

游新兆  黄立人  任金卫  程鹏飞  过静珺 《大地测量与地球动力学》2003,23(3):116-119

介绍了欧洲全球卫星导航系统EGNOS与GALILEO系统，简要论述了美国GPS系统和俄国GLONASS系统发展的最新动向。  相似文献   

固体潮对测站位移影响的理论研究   总被引：3，自引：2，他引：1  

张捍卫  郑勇  赵方权 《大地测量与地球动力学》2003,23(3):98-103

重新推导了IERS2 0 0 0中关于固体潮对测站位移影响的所有公式 ,指出 :在时间域内二阶和三阶引潮力位对测站位移影响的公式中 ,理论上应以测站地心距代替地球赤道半径。利用最新的精密引潮位展开代替IERS2 0 0 0采用的Cartwright&Tayler(1971)潮汐展开 ,重新计算了田谐潮波和带谐潮波的相对频率特性的改正。计算表明 ,以上两种修正在亚毫米量级上与IERS2 0 0 0存在差异 ,这在目前的空间大地测量技术中是必须考虑的。  相似文献   

海洋负荷潮汐对测站位移影响的理论研究   总被引：2，自引：1，他引：1  

张捍卫  郑勇  赵方泉 《大地测量与地球动力学》2003,23(1):69-73

测站位移的海潮效应可以看作是一种负荷影响。海潮负荷对测站位移的影响在某些台站（例如大洋中的岛屿以及沿海岩地区）可达几厘米，因此空间大地测量技术中必须以改正。研究了海洋负荷潮汐对测站位移影响的理论和方法，在推导过程中回避了将点负荷密度展开为球谐函数，而是直接以负荷引力位为基础，并将海潮潮高引入表达式中，推导出了海潮对测站位移影响的有关公式，同时探讨了在毫米级精度时需要注意的一些问题，为空间大地测量学的理论研究提供参考和依据。  相似文献   

Study on preventing frost heave methods for highway foundation in seasonal frozen area     

Xin LI 《东北亚地学研究》2006,9(2):197-198

In order to resolve the frost-heave problem of highway foundation,firstly,the author discussed the law to frost heave of highway roadbed and gave an analysis on its influencing factors,such as soil,water and temperature.Meanwhile,sand clay and silt are given a classification according to frost heave ratio.Secondly,the roadbed frozen damage shows to frost heave and froze boiling based on the frost heave law and its influencing factors.In addition,taking some highway as an example and some principle suggestion was given through the theory on providing frostbite methods for highway foundation frost heave in seasonal frozen area.Specially,an effective method,STYROFOAM extruded polystyrene foam was introduced.  相似文献   

Application of Cluster Analysis in hydrochemical composition classifications-case study of middle reaches of Yinma River     

GAO Shu-qin  CHI Bao-ming  DAI Chang-lei  SHI Feng-zhi College of Environment  Resources  Jilin University  Changchun  Jilin  China 《东北亚地学研究》2005,(Z1)

  相似文献   

Non-specific immune response of bullfrog Rana catesbeiana to intraperitoneal injection of bacterium Aeromonas hydrophila     

张俊杰  邹文政  鄢庆枇 《中国海洋湖沼学报》2008,26(3)

Non-specific immune response of bullfrog Rana catesbeiana to pathogenic Aeromonas hydrophila was studied to 60 individuals in two groups.Each bullfrog in bacterium-injected group was injected intraperitoneally(i.p.) with 0.2 ml bacterial suspension at a density of 5.2 × 106 CFU/ml,while each one in control group injected i.p.with 0.2 ml sterile saline solution(0.85%,w/v).Three bullfrogs in both groups were sampled at 0,1,3,7,11,15 and 20 days post-injection(dpi) for the evaluation of non-specific immune parameters.It was observed that intraperitoneal injection of A.hydrophila significantly increased the number of leucocytes and that of NBT-positive cells in peripheral blood.Significant increases in serum bactericidal activity and serum acid phosphatase activity were also observed in the bacterium-injected frogs when compared with those in the control group.However,a significant reduction was detected in vitro in phagocytosis activity of peripheral blood phagocytes.No significant difference in changes in the number of peripheral erythrocytes,serum superoxide dismutase(SOD) activity,and lysozyme activity was detected between the two groups.It is suggested that bullfrogs may produce a series of non-specific immune reactions in response to the A.hydrophila infection.  相似文献   

Repacking practice for G-3 engineering driller power unit with drive shaft of dual channel reverse circulation     

Lihong ZHU  Kun YIN  Qingyan WANG  Yong HUANG College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2008,11(1):42-46

In order to satisfy operating requirements for constant core drilling technology in reverse circulation with hollow-through DTH, the power unit of G-3 engineering driller was ameliorated. The new one with dual channel drive shaft, achieved the perfect assemble with transmission structure of the original power unit. It could interconvert according to need by using two sets of drive shafts with direct and reverse circulation. The repacked G-3 engineering driller carried on experiment in the field test in Luanchuan molybdenum mine of Henan, whose effect was very good.  相似文献   

Experimental study on pore water pressure dissipation of mucky soil     

Xianwei ZHANG  Changming WANG  Junxia LI  Bin WANG College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2008,11(4):251-255

Pore water pressure has an important influence on mechanical properties of soil. The authors studied the characteristics of pore water pressure dissipating of mucky soil under consolidated-drained condition by using refitted triaxial instrument and analyzed the variation of pore pressure coefficient with consolidation pressure. The results show that the dissipating of pore water pressure behaves in different ways depends on different styles of loading. What is more, the pore water pressure coefficient of mucky soil is less than 1. As the compactness of soil increases and moisture content reduces, the value of B reduces. There is a staggered dissipating in the process of consolidation, in which it is a mutate point when U/P is 80%. It is helpful to establish the pore water pressure model and study the strength-deformation of soil in process of consolidation.  相似文献