China's water conservancy and hydropower enterprises continue to face the challenge of lagging hydropower standards despite being a major player in the construction of water conservancy and hydropower projects. This paper presents a theory for evaluating the social integration process of immigrants in water conservancy and hydropower projects. The theory aims to promote China’s ‘Belt and Road’ strategy, enhance China’s modernization, and establish China’s right to speak. The paper explains the overall framework, process evaluation, and result evaluation of the theory. The evaluation process can be divided into three periods: planning, placement, and later support. The result evaluation is divided into three aspects: environmental adaptation, population development, and cultural integration. Using the Three Gorges Project as an example, this text preliminarily tests the science, rationality, and feasibility of the entire assessment theory. In the future, research on engineering immigration should expand the application scope of the whole process assessment. Sufficient attention should be paid to the problem of social restructuring, and efforts should be made to build an assessment system with Chinese characteristics.
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针对当前小水电发电量预测中资料短缺、发电不稳定等问题，采用LM-BP神经网络法和多元线性回归法进行了对比分析。神经网络法通过相关分析和自相关分析筛选出与日发电量有显著关系的因子作为模型输入，以小水电日发电量作为输出，构建LM-BP神经网络模型，通过试错法确定神经网络最优隐含层节点数并进行模型训练，该方法能够在不同预见期下取得较高的预测精度。多元线性回归法通过检验日发电量与待选因子的相关系数，筛选与日发电量有显著关系的因子作为预测模型方程自变量，利用最小二乘法计算模型参数。多元线性回归方法在预见期为1 d时预测精度与LM-BP神经网络模型接近，但在更长预见期的滚动预报中精度低于神经网络法。
清华大学发明的结构化胶结技术通过调节自密实浆液流动性和粘性控制浆液在堆石料孔隙中的流动扩散范围,将堆石料按照设计目标进行部分胶结,在提高堆石料强度、弹性模量等力学性能的同时,仍然保持堆石料的散粒体特性,能适应地基较大变形.在覆盖层上建设结构化胶结堆石坝,可减少堆石坝体积,减少坝体沉降,提高坝体抗冲缓溃能力.介绍了结构化胶结技术在某混凝土面板堆石坝除险加固工程中的应用,该新型技术的应用可为后续相似病险坝的加固处理提供借鉴,也为新建结构化胶结堆石坝积累了设计施工经验.
The dynamic performance of dam concrete is a critical factor in the seismic design and safety verification of dams. In order to fully understand the dynamic characteristics of Xiluodu Dam concrete， a 15 MN large MTS material testing machine is utilized to carry out the uniaxial compression test， uniaxial compression elastic modulus test and splitting tensile test of core specimen of C 180 40 concrete under different strain rates， and the dynamic mechanical property parameters of dam concrete core specimen are obtained. The test results show that the uniaxial compressive strength and splitting tensile strength of core specimen of concrete are significantly affected by the rate of strain. The energy absorption capacity of concrete increases with the increase of strain rate， and the two shows a strong correlation. The compressive strength and splitting tensile strength of concrete core samples are different from those of full-graded concrete large specimens and wet-screened small specimens. The reasons are not only the increasing of dam concrete strength in the later period， but also the differences between the conditions of mixing， pouring and curing of dam concrete in the field and those of laboratory forming and curing. The conclusions of this study can provide scientific basis for further research on seismic safety of Xiluodu Dam during operation period.
