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在碧口水电站土石坝壤土心墙的孔隙压力计算中,初始孔隙压力系数(?)与竖向正应力采用非线性关系,且在(?)与(?)间取值;采用差分法及有限单元法进行孔隙压力消散计算。观测采用渗压计。从初步成果看,(?)的取值是可行的;考虑心墙拱效应后,竣工时的孔隙压力计算值与观测值比较接近。 相似文献
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土石坝因其造价低廉.结构简单,施工简单,在我国水利工程中得到广泛应用。本文就土石坝的施工工艺技术作简单论述。 相似文献
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土石坝是我国水利工程中的重要项目之一,其质量与安全关系到周围地区百姓的生命财产安全,因而针对其除险加固的研究具有十分重要的现实意义和社会意义。本文针对土石坝常见的危害加以分析并提出针对性的解决措施,以期对促进土石坝的加固有所参考意义。 相似文献
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土石坝是应用十分广泛的建筑物,具有挡水的作用,同时具有施工便利、能够就地取材的优势,其施工质量得到了人们的广泛关注和重视,由于土石坝的主要组成部分为砂土和砾石等,对施工有较高的要求.基于此,结合实际施工经验,对水利工程中土石坝坝体施工准备工作以及施工技术要求进行全面的分析. 相似文献
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根据作者的实际工作经验,探讨如何保护地基原型试验观测仪标,提高观测精度,预防读数错误等改进地基原型试验观测技术的方法及注意事项。 相似文献
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在现代化水利工程建设中,土石坝施工技术发挥着极为重要的作用,土石坝作为水利工程的重要核心组成部分,其渗漏问题一直得到了人们的重视。水利工程中土石坝渗漏不仅影响着人民的生命财产安全,更直接影响了水利工程的经济利益。文章主要分析了水利工程土石坝防渗处理技术措施,以供参考。 相似文献
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从土石坝现场安全检查和安全检测两个方面入手,展开了对水库大坝安全评价工作的技术探讨,论述了土石坝现场安全检查与安全检测工作中的技术要点,较详细地阐述了各环节应注意的关键问题。 相似文献
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随着社会主义社会的发展和进步,土力学理论以及科学技术的发展,各类工程建设项目在我国不断兴起,带动着现代施工技术也应用而生。在各类工程项目建设中,其中土石坝的兴建就是比较广泛建设的一类,但是在建设项目过程中也出现了很多问题,其中渗流带来的巨大破坏导致其变形等一系列问题都是值得关注和改善的问题。土石坝防渗变形的处理关系着土石坝整体的稳定和安全,更关系着人民的安全,因此对于其出现的渗流、变形等问题一定要认真对待和找到解决办法,本文针对土石坝出现的渗流变形等问题展开探讨,同时结合施工技术加强其防渗加固,为此找到解决办法。 相似文献
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本文从渗透力的基本概念出发。在指出作为常规坝坡稳定分析的条分法存在的问题后,提出结合渗流分析,直接用有限单元法进行坝坡稳定分析,开给出了单一圆弧和复会圆弧滑动面的计算公式。为了验证计算方法和编制的程序的正确性,我们对六个发生滑坡的土坝进行调查分析并在实验室内进行水力模型试验,试验和分析计算都得出了将要发生滑坡事故的结论,而且出现的最危险滑弧位置和水力条件也和实际情况甚为一致。然而按照常规条分法计算分析却不能得出各土坝滑坡的肯定结论,这就说明了本文论证的有限单元分析方法的准确性和可靠性。 相似文献
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《Soils and Foundations》2009,49(6):921-939
The paper illustrates theoretical and experimental procedures adopted to characterize the seismic response of earth dams by performance-based criteria. The study refers to a real case, the Camastra Dam, a zoned earth dam with vertical clay core, placed in a highly seismic zone of Southern Italy. At first, the analysis objectives have been identified along with the physical quantities needed to achieve them for characterizing dam seismic performance. A theoretical approach, consistent with the identified analysis objectives, has been later selected. The adopted approach is based on continuum mechanics and accounts for coupling between soil skeleton and pore water phase. It is also able to describe the main features of soil response under cyclic loading conditions since it implements an advanced constitutive law for the soil skeleton. Big effort has been paid to the mechanical characterization of the dam materials. In addition to data coming from the interpretation of the laboratory tests performed at the time of dam construction, in situ tests (SASW, Down Hole, DMT) have been recently carried out on the embankment and foundation soils and interpreted consistently with the requirements of the selected theoretical model. Preliminarily, the static stages of the dam lifetime have been numerically simulated to reproduce the behaviour observed in terms of cross-arm settlements and pore water pressures, in order to obtain or verify some soil parameters and initialize the state variables for the simulation of the seismic stages. A seismological study of the dam site provided the expected seismic scenarios in terms of time histories of acceleration, needed as input for the dynamic analyses. The seismic response of the Camastra Dam was finally investigated and discussed in the light of performance-based criteria. 相似文献
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对我国加筋土技术的工程应用概况、设计计算理论、加筋材料研制和开发等进行了简要的回顾 ,讨论了加筋土技术应用中应注意解决的主要问题——设计计算理论和计算方法、加筋材料的耐久性和设计使用年限、规范的修订和完善问题 ,指出了加筋土技术应用发展趋势 相似文献
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Luca Pagano Enzo Fontanella Stefania Sica Augusto Desideri 《Soils and Foundations》2010,50(2):295-307
The paper describes and interprets watertightness problems that occurred in two Italian earth dams: the Polverina Dam, a zoned earth dam with vertical clay core, and the Zoccolo Dam, a homogeneous embankment with upstream facing of bituminous conglomerate. Measurements of seepage flows, pore water pressures and displacements in different stages of the dams' lifetime were collected and suitably interpreted to detect the effectiveness of measured physical quantities in revealing watertightness problems. The paper focuses on the role of pore water pressure measurements to such a scope and enhances how the effectiveness of such measurements may be strongly affected by the particular stage reached by the consolidation process within the dam. The analysis of the two case-studies proved that pore water pressure measurements may result effective in revealing hydraulic problems only when significant re-equilibrium processes have taken place in the dam zones where the measurement points are located. Measurements result, instead, ineffective during a nearly undrained stage. The paper also discusses the effectiveness of seepage flow measurements to detect possible hydraulic problems. 相似文献