Shallow landslides in deeply weathered slates of the Sierra de Collcerola (Catalonian Coastal Range, Spain)     

Domenico Calcaterra  Jos A. Gili  Roberto Iovinelli 《Engineering Geology》1998,50(3-4):283-298

Stability conditions in an area located NW of Barcelona (Spain) are discussed. Here, several mass movements were observed, mainly affecting weathered Paleozoic slates. Many of these failures involved slopes cut along recent infrastructures: debris flows, wedge and plane failures, generally surficial, occurred more frequently. After a detailed geological and geomorphologic survey, geomechanic characterization was carried out, according to RMR and SMR classifications. This rating gave a prediction of slope behaviour, in fairly good agreement with the real observed one.

Stability numerical analysis was carried out for the main cut slopes, based upon the Limit Equilibrium Method. First of all, the deterministic factor of safety was computed using the mean values of parameters. After that, a simulation technique based upon the Monte Carlo Method was applied in order to obtain factor of safety distributions. The probability of failure was estimated as P(F<1).

Finally, results from deterministic and probabilistic approaches were compared. The effectiveness of different possible remedial measures was highlighted by means of a sensitivity analysis, which showed that the more important parameters in the study area are the geometrical ones (height, slope and failure plane angles). The final technical solutions adopted are briefly outlined.  相似文献   

黄土基底构筑物边坡稳定的研究方法   总被引：1，自引：0，他引：1  

祖国林  洪宇 《地质灾害与环境保护》1998,9(4):16-20

我国适合露天开采的煤田,主要分布在西部及西北部的黄土高原地区。黄土基底构筑物在加载过程中,曾出现过某些惨痛的工程教训。基于黄土基底排土场形成后黄土底工程性质演化规律及失稳机制分析,提出其边坡稳定的研究方法,对黄土高原地区煤炭资源开发建设具有重要的理论与实际意义。  相似文献   

铁路隧道的施工工程地质及围岩量测数据处理系统   总被引：1，自引：0，他引：1  

吉随旺 《地质灾害与环境保护》1998,9(1):61-64

讨论了铁路隧道的施工工程地质工作的内容及必要性,并介绍围岩变形量测及其数据处理系统。  相似文献   

逆斜率法及其讨论     

吴耀华 《上海国土资源》1998,(1):29-34,45

经对上海地区51根试桩资料分析表明,同实测值比较,计算值误差一般不超过30％,误差与未次加载的ΔSn/ΔPn比值似有一定的相关性,当比值大于2,误差一般不超过20％,同时对没有达到终至加载条件的试桩也可采用此法估算。  相似文献   

关于推行岩土工程专业体制的思考与实例     

黄晶莹 《湖南地质》1998,17(3):174-177

岩土工程专业体制的核心内涵,是强调岩土工程勘查,设计,施工,监测,监理５个环节的整体和统一性。岩土工程师,不仅要为建设工程设计提供地质资料,而且还要积极参与或争取主持整个岩土工程项目的设计与施工,本文以实例阐明了其可能性与必要性。  相似文献   

位移时空综合分析法及其在边坡工程中的应用   总被引：1，自引：1，他引：0  

尚彦军  唐纯华 《工程地质学报》1998,6(3):238-243

以往对监测位移数据分析方法主要是位移-时间关系分析。但监测数据包含了大量对工程设计和施工都很有用的信息,其中不乏位移-空间方面的信息;另一方面,从工程设计和施工角度看,除需要位移-时间信息外,还需要位移-空间信息。位移时空综合分析法的提出旨在综合位移-时间和位移-空间等两方面的信息,为工程设计和施工服务。该方法依表现形式不同又分为竖线法和曲面法两种。本文将通过五强溪船闸边坡工程实例,来进一步说明位移时空综合分析法的原理及其应用。  相似文献   

初值形成方法对降水数值预报的影响     

俞小鼎 《高原气象》1998,17(3):310-316

北欧有限区域模式ＨＩＲＬＡＭ被应用于中国的暴雨个例以探讨初值形成方法对有限区域模式定量降水数值预报的影响,对两种初值形成方案进行了对比,一种是由ＨＩＲＬＡＭ自己的数值同化系统提供初值,另一种是直接内插ＥＣＭＷＦ全球模式的相应分析场,与这两种方案对应的数值试验分别是控制试验（ＣＯＮＬ）和对比试验（ＣＯＭＰ）,将ＣＯＮＬ和ＣＯＭＰ的降水预报与观测值比较,结果表明：（１）当为ＣＯＭＰ提供初值的ＥＣＭＷＦ  相似文献   

The generation and redistribution of overland flow on a massive oxic soil in a eucalypt woodland within the semi-arid tropics of North Australia     

Mike Bonell  John Williams 《水文研究》1986,1(1):31-46

There is a dearth of knowledge on the runoff processes of eucalypt woodland communities in the semi-arid tropics of Australia. The work was undertaken on a 100 m transect of a 0·8 degree hillslope typical of the ‘smooth plainlands’ of central-north Queensland. This paper introduces a new experimental design for measuring overland flow in such areas by way of a cascade system of unbounded runoff plots which allow the inputs and outputs between troughs to be calculated. Most storms generate overland flow. Time to overland flow ranges between 1 and 18 min where rain intensities are above 10mm hr⁻¹ and when the average detention storage of 3·6 mm is exceeded. The bare soil surfaces within the scattered grass understory control the runoff generation process through the temporal variability of field saturated hydraulic conductivity. The study demonstrated that overland flow is mainly redistributed over the freely-draining oxic soil. Some areas export more overland flow than they gain from upslope (runoff), others gain more overland flow than they export (runon). Over the study period only 2 per cent of total rain is transferred out of this 100 m transect as overland flow due to the short duration of storms, the relatively high soil permeability, and the low slope angle. The remainder adds to the large soil water store or deep drainage. The variability of runoff–runon over these ‘smooth plainlands’ highlights how results from bounded plots would be misleading in such areas.  相似文献   

Three-dimensional simulations of a starburst wind     

Jackie L. Cooper  Geoffrey V. Bicknell  Ralph S. Sutherland  Joss Bland-Hawthorn 《Astrophysics and Space Science》2007,311(1-3):99-103

In order to better understand the formation of a starburst-driven wind, we have performed a series of three-dimensional hydrodynamical simulations in an inhomogeneous interstellar medium. We present the results of these simulations, which provide new insights into the formation of the optical filaments and the origin of the soft X-ray emission.  相似文献   

关于我国电力建设问题     

陆大道 《云南地理环境研究》1990,2(1):10-13

本文在分析我国能源资源分布特点,总结过去电力建设经验的基础上,通过水、火电全面经济效益比较,认为,在我国具体的国情和国力条件下,今后必须贯彻优先开发水能的方针,并提出了因地制宜发展水电建设应注意做好的四项工作。  相似文献