某铜矿尾矿砂力学特性和尾矿坝变形稳定性分析

以云南某铜矿拟建中线法尾矿坝为研究对象,对底流、溢流2种尾矿砂进行了物理力学特性试验,获得了其物理力学指标并应用于尾矿坝数值分析。得到了尾矿坝的应力变形特性,不同堆积高程、不同工况下尾矿坝的安全稳定性。结果表明,底流、溢流2种尾矿砂无明显剪胀;坝体内以压应力为主;高堆积高程,地震荷载作用下坝体稳定安全储备不足;浸润线降低明显提高坝体稳定性。分析结果可为尾矿坝设计提供参考。     

三峡库区外迁移民心态调查及对策研究

三峡库区外迁移民迁出世代生活的故土家园而重辟生活空间,其心态必然发生重大变化.在已经实现移民"搬得出"的基础上,要继续实现"稳得住,逐步能致富"的目标,各级政府和移民机构必须及时了解和掌握移民的心态,方能更好地完善移民后期扶持政策,作出移民工作的科学决策,推动移民经济的可持续发展.     

黄河大柳树坝址岩体结构模拟及边坡稳定性评价

研究了黄河大柳树坝址的岩体结构面参数。采用Ｍｏｎｔｅｒ－Ｃａｒｌｏ模模拟了该区岩体的结构面网络。     

柯依那坝的地震可靠度分析

本文对印度柯依那重力坝进行了随机地震反应分析.首先用一非平稳的随机过程来模拟1967年12月11日地震时的地面运动加速度,并提出了一个基于有限单元法的重力坝地震可靠度分析方法,计算结果对坝体裂缝的成因可作出较为合理的解释.     

复杂系统态势评估模型及其本体论实现方法

针对复杂系统的在线态势评估问题，依据信息融合理论，提出了一种新的网络在线态势评估模型。它采用定性与定量、局部与综合相结合的评估策略，即首先进行快速定性评估，一旦系统异常，立即启动集成神经网络组对来自系统多侧面的故障特征信息进行定量分析和分类，最后两级D-S证据推理模型在各自的融合中心实现对各子网络的融合，提高了评估的精度和可靠性。基于本体论成功地实现了该模型，在丰满水电数字仿真系统的成功应用验证了模型的有效性和实际应用价值。     

A Study of the Crustal Stability in the Yangtze Three Gorges Area

TheThree GorgesHydroelectricPow erProjectontheYangtzeRiverwillstorewaterandgenerateelectricpowerin 2 0 0 3.Itsgreatdamwasdesignedtobe 1 85mhigh ,withaninstallingcapa bilitytobe 1 7.6 8millionkWh ,andatotalreservoirstoragetobe 39 3billionm3 .ThisisanimportantmatterinChina seconomicconstructionandalsoamonumentalprojectinChinesehistory(Fig 1 ) [1 ] .Thus,thecrustalstabilityforthegreatdamhasattractedmuchat tention .Theauthorshadcarriedoutfieldinvestigationanddemonstratedthefeasibilityoftheeng…     

地震强度对Upper San Fernando土坝流动变形的影响

对UpperSanFernando土坝进行一组抗震性能分析，采用基于与状态相关的剪胀性理论的临界状态砂土模型，描述土在所有可能加载条件下的响应。除了给出土坝的总体位移及变形状况外，还提供了土在局部位置的应力路径和应力应变关系。堤坝变形的计算值与现场观测的结果非常接近。     

小浪底大坝左岸山体渗压分析

介绍了小浪底大坝左岸山体渗压监测设计方案及测点布置情况,分析了渗压分布的规律和特点,渗压和渗流量的对比分析以及回归分析结果显示,左岸山体经过3次防渗处理后,渗流已经得到有效控制.     

ADP-flow velocity profile to interpret hydromorphological features of China''''s Yangtze Three-Gorges valley

Land and sea are linked closely by large rivers throughrunoff and sediment discharging and biochemical materialtransferring into the sea[1?3]. The processes carried out byenergy exchange have been in a sensitive response toglobal change[4]. To study the mechanism of sediment transport in the river basin as to reflecting hydromor- phological and climatological controls is thus becoming vital for earth scientists, at present and in the near future since any change in fluvial landform is of a gre…     

The impact of damming on geochemical behavior of dissolved inorganic carbon in a karst river

To determine the impact of damming on the geochemical behavior of dissolved inorganic carbon （DIC） in the Wujiang River basin, field measurements and samples were collected semimonthly for a year. The surface waters of the reservoirs contained concentrations of chlo- rophyll a up to 5.6 times higher than the upstream river. Compared with the entering waters, the contributions of HCO3- and dissolved CO2 to DIC decreased, and the contribution of CO32- to DIC and the carbon isotopic composition of DIC （δ13CDIc） increased in the surface waters of the reservoirs, while in the waters released, the DIC species showed reverse geochemical behaviors. The δ13CDIc ranged from -10.2 %o to 2.5 %0, indicating that significant contributions were from carbonate weathering, photosynthesis, and respiration. After the damming of a river, the bioactivity of phytoplankton was enhanced, and this affected the geochemistry of DIC compared to an unimpacted river and δ13CDIC can be used to discern these changes. High-frequency monitoring of river-reservoir systems is necessary to evaluate the efflux of CO2 and provide a better understanding of the carbon sinks and sources in the impounded river.