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71.
极端冰雪条件下的顺层岩质边坡滑移稳定性分析 总被引:1,自引:0,他引:1
推导了典型岩石边坡在极端冰雪条件下的滑移稳定系数的表达式;通过计算分析,揭示了岩石边坡滑移稳定系数随裂隙内水深、坡高、坡角、滑面倾角等因素变化的规律及与冻深的关系,并绘制岩石边坡滑移稳定系数与边坡几何要素之间的关系图.研究表明,当考虑极端冰雪灾害影响时,岩石边坡滑移稳定系数发生较为明显的变化:随裂隙饱水程度、坡面角、主... 相似文献
72.
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通过对我国西南某高拱坝坝基花岗岩体内穿插的辉绿岩脉的侵位和后期构造—热液作用以及浅表改造作用的研究,并对比各组不同走向辉绿岩脉的变形破坏特征,查明坝基辉绿岩脉在其活动后期热液蚀变的基础上,在同一构造应力作用下,各组辉绿岩脉具有不同的主要变形破坏方式,即脉壁张裂、剪切滑移和挤压破碎等,从而控制坝基岩体内与岩脉有关的各种软弱结构面、工程岩体结构及其力学性质,并简要讨论了各组岩脉对拱坝坝基抗滑稳定性和变形稳定性的影响。 相似文献
74.
结合GIS空间数据分析能力与极限平衡法开发了可视化的土质边坡稳定性分析系统GiSlope,介绍了边坡几何模型、外荷载与加筋结构模型、滑动面及地下水位线模型等分析模型的可视化建立过程,阐述了计算分析的设定、任意形状滑动面土条条分方法以及计算参数的确定方法。通过对几个典型实例的分析与国内外商业软件计算结果的对比,验证了系统计算的正确性和可靠性。 相似文献
75.
Mateos S Daza P Domínguez I Cárdenas JA Cortés F 《Environmental pollution (Barking, Essex : 1987)》2008,153(3):590-593
A field study was carried out in the south of the Iberian Peninsula in an industrial area in the neighbourhood of Huelva city, SW Spain, and in a natural area (Do?ana National Park) for comparison, to estimate the genetic risk induced by environmental pollution in wild mice. Genotoxic effects in a sentinel organism, the Algerian mice (Mus spretus) free living in the industrial area were compared with animals of the same species living in the natural protected area. The single cell gel electrophoresis, or Comet assay, was performed as a genotoxicity test in peripheral blood of mice. Our results clearly show that mice free living in the contaminated area bear a high burden of genetic damage as compared with control individuals. The results suggest that the assessing of genotoxicity levels by the Comet assay in wild mice can be used as a valuable test in pollution monitoring and environmental conservation. 相似文献
76.
输电塔结构的动力稳定性研究 总被引:3,自引:0,他引:3
作为一种重要的生命线工程,输电线路的破坏会造成巨大的经济损失。统计显示,风荷载作用下输电塔结构的动态侧倾失稳是输电线路经常发生的破坏形式之一。因此,对风作用下输电塔结构的失稳破坏进行研究有着十分重要的意义。本文应用谐波叠加法模拟脉动风场,分别采用Budiansky-Roth准则和动态增量法(IDA)结合位移相等准则这两种方法,基于ANSYS的非线性屈曲分析和时程分析模块,对沈阳某输电塔的抗风动力稳定性进行了研究。结果表明,风的动力特性对结构稳定性影响较大,现行规范中按等效静力风荷载进行计算是偏于不安全的。 相似文献
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78.
在不同工况下,通过采取不同的岩土体物理力学参数来计算沙坝沟滑坡的稳定系数并分析影响因素,得到影响该滑坡稳定性的主要因素为降雨、地下水作用及人类工程活动,在一定条件下可能成为滑坡失稳破坏的诱导因素。最后为滑坡防治提出一些建议,对滑坡的预测和防护提供依据。 相似文献
79.
A recently favored hypothesis is that duetting in birds has a mate-guarding function: a male responds vocally to his partner’s
song, thereby forming a duet that repels males who are attracted to her song. Previous studies have not provided unambiguous
tests of the mate-guarding hypothesis because: (1) the probability of a male answering his partner’s song has not been shown
to increase specifically when the female is fertile, and (2) the probability of a male answering his partner’s song has not
been assessed separately from simply a higher song initiation rate. We investigated extra-pair paternity, mate-guarding, and
duetting in the socially monogamous Australian magpie-lark (Grallina cyanoleuca). DNA fingerprinting revealed that 3% of young were the result of extra-pair paternity, and we found that males guarded fertile
females by staying close to them. However, males did not initiate songs at a higher rate when females were fertile and actually
reduced their probability of replying to female song during this period. We conclude that although male magpie-larks did guard
fertile females in an attempt to prevent extra-pair copulations, they did not use duetting for this purpose.
Received: 10 May 1999 / Received in revised form: 27 September 1999 / Accepted: 2 October 1999 相似文献
80.
Social and mating system of cooperatively breeding laughing kookaburras (Dacelo novaeguineae) 总被引:4,自引:0,他引:4
DNA fingerprinting was combined with field observations over four breeding seasons to investigate the social structure and
mating system of the laughing kookaburra (Dacelo novaeguineae). Groups comprised a socially dominant pair and up to six helpers of either sex. Helpers were always recruited from young
hatched in the group. Territorial inheritance, which is a feature of other cooperative breeders and an oft-cited benefit of
philopatry, did not occur. Helpers only attained dominant status in an established group by dispersing into a vacant dominant
position in that group. However, helpers could also form new groups by excising a new territory, often through a ”budding”
process. The mating system was overwhelmingly monogamous. There were no cases of extra-group parentage in a sample of 140
nestlings; within groups of three or more birds, dominance predicted parentage almost perfectly (99.2% of 129 nestlings),
irrespective of whether helpers in the group were related to one or both dominant birds. This is contrary to predictions from
models of reproductive skew, possibly because they currently fail to incorporate the willingness of females to share reproduction
among males.
Received: 15 May 1999 / Received in revised form: 2 November 1999 / Accepted: 6 November 1999 相似文献