Abstract: We present a new technique for estimation of the elastic modulus of plastic concrete. A mixture of typical concrete with clay and bentonite, plastic concrete has been widely used in recent years for developing diaphragm cut-off walls in many dam projects throughout the world. It is important to properly estimate the elastic modulus of plastic concrete for dam safety because it should be close to the elastic modulus of surrounding soil to withstand the imposed deformations without breaking up. A review of the literature showed that the existing methods for elastic modulus calculation are not so efficient and the obtained data are scattered. After several experiments, we noticed that the main problem associated with the error in modulus estimation is the way that the strain is being measured during the test. Therefore, we proposed a new technique for strain measurement. To resolve the problem, we changed the stain gauge arrangement and shortened the distance used for strain measurement. The strain gauge was directly connected to the sample. Using the new technique, the stress-strain curve of plastic concrete was significantly improved and showed more stable and reliable behavior. Good time-trend was observed for age-elastic modulus relationship of specimens using the new method.
摘要：提出了一种新的技术，用于估算塑性混凝土弹性模量。塑性混凝土是典型混凝土与粘土，膨润土的混合物，近年来已广泛应用于世界各地许多大坝工程中防渗墙的发展。重要的是，正确估算大坝安全的塑性混凝土弹性模量，因为它应当接近周围土壤的弹性模量，以便承受外加变形而不破裂。文献回顾表明，弹性模量估算的现有方法并不那么有效，并且获得的数据比较分散。经过多次实验，我们发现，与模量估算错误相关的主要问题是测试期间测量应变的方式。因此，我们提出了应变测量的新技术。为了解决这个问题，我们改变了应变仪配置，缩短了用于应变测量的距离。使应变仪直接与样本相连接。使用新的技术，显着提高了塑性混凝土的应力应变曲线，显得更加稳定和可靠。利用新方法观察试件的龄期弹性模量关系的良好的时间趋势上海日语翻译。
In this paper, we report a new technique used for estimation of the deformability modulus of plastic concrete in the Gotvand dam project. Gotvand, an earth and rock-fill dam with central clay core having a height of 180m and a crest length of 760 m, is currently under construction in southwest Iran on the Karun River. The project includes an embankment across the Karun River, a power house with total capacity of 2000 MW at the left abutment and a gate-controlled chute-type spillway with the Probable Maximum Flood (PMF) discharge of 17000 m3/s located at the right abutment. Figure 1 shows the general plan of the dam. The main objectives of the Gotvand dam construction are electric power supply, control of seasonal floods of the Karun River, and control of agricultural downstream water [1]. Having a total reservoir capacity of about 5000 MCM at the maximum water level, the Gotvand dam will be the second largest dam in Iran in view of reservoir capacity.
在本文中，我们报告用于Gotvand大坝项目中塑性混凝土变形模量估算的一项新技术。 Gotvand，具有中央粘土心墙的堆石土坝，高180米，坝顶长760米，目前正在伊朗西南部的Karun河沿岸施工中。该项目包括一个跨越Karun河的路堤，在左坝肩的一座总产能2000兆瓦的发电厂，以及位于右坝肩的闸门控制降落伞式溢洪道，可能最大洪水（PMF）量为17000 m3/s。图1显示了大坝的总体规划。Gotvand大坝的主要目标是电力供应，控制Karun河的季节性洪水，以及控制农业下游水[1]。Gotvand大坝在最高水位的总库容约为5000MCM，鉴于此，它将会是伊朗第二大水坝北京英语翻译。
