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广东某滑坡特征及稳定性评价 总被引:1,自引:0,他引:1
根据对广东某滑坡的分析,其属于蠕滑-拉裂型滑坡。根据大量的详细勘探资料,详细阐述了滑坡的基本特征,并研究分析了滑坡的成因机制及演化过程;在成因机制分析基础上,采用剩余推力传递法(Push法)对该滑坡天然状态及暴雨两种工况下的稳定性进行了计算和评价,为滑坡治理设计提供了重要的依据。 相似文献
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三角带滑坡是典型的久治不愈滑坡,随着三峡库区蓄水,三角带滑坡呈现古滑坡的复活和新滑坡的形成双重变形,极端气候必定会对其稳定性产生影响。本次研究选取三角带滑坡的深层滑面、浅层滑面及高焦炉古滑坡的滑面为对象,对4种工况下的滑坡稳定性进行评价。评价结果表明:(1)在洪水和暴雨极端条件下,高焦炉古滑坡各剖面均处于稳定状态;三角带滑坡浅层滑面由基本稳定向欠稳定状态转变,局部出现不稳定状态;三角带滑坡深层滑面由基本稳定向欠稳定状态变化;(2)通过φ值与c值参数敏感性比较分析可以看出,φ值对滑坡稳定系数的敏感性较大;(3)综合分析结果表明,三个滑坡稳定性评价结果为:三角带滑坡深层滑面<三角带滑坡浅层滑面<高焦炉古滑坡,且在暴雨和洪水极端气候的双重影响下均发生一定的稳定性下降现象。 相似文献
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雅砻江中游某巨型滑坡距离拟选坝址仅1.3 km,目前滑坡体上有裂缝发育,滑坡的整体稳定性对于坝址的选择具有颠覆性的影响。因此,在概要介绍滑坡地质特征基础上,对滑坡体上裂缝发育分布特征及其成因机理探讨,对裂缝的产生是由整体还是由于局部导致给出明确回答,进而依据滑坡工程地质特征及定量计算对蓄水后滑坡的整体稳定性作出预测。 相似文献
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三峡水库区地形条件、自然地质条件复杂是我国地质灾害的多发区及重灾区。三峡大坝的兴建在一定程度上改变了原有地质环境的脆弱平衡状态,加剧了地质灾害的发生。在研究三峡库区某滑坡的工程地质条件及滑坡体基本特征的基础上,分析了诱发坡体失稳的主要因素,并对该滑坡在四种不同工况下的稳定性进行了验算,验算结果表明,该滑坡目前现状条件下处于稳定状态;在库水位蓄水或者库水位骤降情况下,滑坡体将处于整体失稳状态,因此,有必要采取一定的防治措施确保在三峡水库蓄水之后滑坡处于稳定状态。 相似文献
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《CATENA》1988,15(6):539-553
Variables which correlate with accelerated landslide activity are identifed in a study of two new hill roads at Almora and Nainital, U.P., India. Cumulatively, 32% of the roadcut is affected by rockfall and 27% by the slumping of rock and/or regolith. Correlation and discriminant analyses suggest that rockfalling may be predictable from measures of the frequency of enlarged joints in the roadcut supported by members of an inter-related complex of variables including slope angle, roadcut height, apparent dip, rock strength, and upslope vegetation cover. Direct measures of environmental instability, such as the undermining of the roadbed by erosion, were also shown to have value. However, the study found few useful environmental indicators of slumping. A positive relation between slumping and tree cover upslope may reflect the fact that forest survives as a relict landuse in locations which are undeveloped because of their instability. 相似文献
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我国沙尘暴灾害初步研究 总被引:11,自引:0,他引:11
2000年北京地区发生了12次沙尘暴、扬沙和浮尘天气,这是全国引起强烈反响。据建国50年来全国67773条气象站沙尘暴记录分析认为,我国沙尘暴易发区域广泛,但多发区集中在我国西部,与荒漠化状况相近;70年代前沙尘暴有增无减,但因当时人们生态环境意识薄弱并未引起足够重视;70年代是我国沙尘暴发生频率最高时期,80-90年代局部和小范围沙尘暴发生次数逐渐减小,强度有所减轻。但随着区域经济的发展,沙尘暴灾害损失日趋增大。建设林草植被、改善生态环境对减小局部和小范围沙尘暴发生次数及灾害程度具有重要作用。 相似文献
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A new 15N tracing model was developed to analyse nitrogen (N) transformations in old grassland soil. There was a need to develop a new model because existing models such as FLUAZ were not able to simulate the observed N dynamics. The new features of the model are: (a) simulation of heterotrophic nitrification, (b) simulation of dissimilatory nitrate (NO3−) reduction to ammonium (NH4+) (DNRA), (c) release of adsorbed or stored fertiliser N into the available mineral N pools and (d) immobilisation of NH4+ and NO3− into two separate organic N pools with different re-mineralisation characteristics. The tracing model contains six N pools and nine simultaneous N transformations either at zero- or first-order kinetics. The model is set up in the modelling software ModelMaker which contains non-linear optimisation routines based on the Marquardt-Levenberg algorithm. The model is able to simulate data obtained from triple labelling studies where either the NH4+, the NO3− or both pools were labelled with 15N. The flexible modelling environment allows the user to develop the model further. 相似文献
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Clayey silts involved in a landslide have been sampled to study the role of sediment composition in developing sliding surfaces. Five drillings enabled the collection of 46 samples and to define active slide surfaces and non-active surfaces (discontinuities). 相似文献
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灌溉农田水汽氢氧同位素组成特征研究初探 总被引:1,自引:0,他引:1
灌溉农田生态系统水汽变化能够直接反映其耗水状况。本研究应用基于高频实时气态稳定同位素分析仪的箱式法测定水汽氢氧同位素特征, 结合涡度相关技术所测定的农田水汽通量结果, 探讨不同高度大气水汽在不同时段的稳定同位素组成特征。研究结果表明: 对于不同的时间尺度, 生态系统边界层水汽稳定同位素组成在连续几天内的变化有波动, 日变化比较稳定, 小时尺度波动很小; 水汽稳定同位素的大气背景组成特征表现为日尺度上的组成变化呈稳步富集趋势, 小时尺度上几乎无变化。蒸散水汽重同位素特征随时间推移富集明显, 午夜蒸发和蒸腾水汽同位素组成特征相似, 清晨蒸腾水汽比蒸发水汽轻, 午间蒸腾水汽比蒸发水汽重。对于不同高度的水汽来说, 玻璃箱内蒸散水汽稳定同位素组成要比生态系统边界层2 m 处水汽高。建立了土壤蒸发和植物蒸腾稳定同位素变化特征与蒸散过程的线性关系, 相关系数达到0.87。 相似文献
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Chris Stoate Stephen Jones Felicity Crotty Carol Morris Susanne Seymour 《Soil Use and Management》2019,35(1):150-159
Soil management influences food production, economic performance of farm businesses, and a range of public benefits such as water quality, flood control and aquatic and terrestrial biodiversity. The aim of this paper is to explore the role of participatory research in combining scientific and farmer knowledge of soils to meet these multiple objectives. We use five separate research studies involving communication, consultation and co‐production, carried out in the English East Midlands between 2014 and 2018. We compare the participatory processes for knowledge exchange and their material outcomes and assess them retrospectively against specified criteria for successful application of participatory research. We conclude that, depending on context and scalar fit, multiple approaches to participatory research can be complementary, strengthen engagement and build trust within a farming community, resulting in a greater shared understanding of how to address the soil management objectives of farmers and wider society. 相似文献
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经实地调查,新滩滑坡的地质条件、滑坡前兆、滑坡特征及其带来的涌浪和危害,总结了它们的规律,提出了涌浪衰减的经验公式。通过滑动面长期强度的力学计算和稳定分析结果证明,新滩滑坡具备了发生滑移的条件,并对该滑坡进一步发展的趋势作了预测:不久将再次暴发滑坡灾难,要不断地监视,采取防治措施。 相似文献
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