GOCAD三维建模技术在基础工程中的应用研究

随着三维可视化技术的不断发展,在工程建设中应用三维技术立体化地展示工程设计成果成为了可能。文章应用了GOCAD软件在地质方面三维建模的强大功能,以真实工程案例为研究对象,分别了探讨了研究场地的三维工程地质地层模拟、地层属性模拟、场地开挖和地基处理工程桩模拟的快速建模流程及关键技术,并对模拟地层的准确性进行了验证。通过应用实例证明,GOCAD软件具有快速建模,可视化效果良好的特点,能够较真实地反映地层分布情况,能够快速实现基础工程中相关的构件建模,将其应用于岩土工程的勘察设计及施工工作中是切实可行的。     

Research on China export structure adjustment: an embodied carbon perspective

This paper calculated the embodied carbon in China export and its distribution in each industrial sector. The calculation results showed the total carbon emission of export experienced an increase before 2007 and then a decrease till 2010. The ratio of export embodied carbon accounting for the total carbon emission in China also increased from 31 % in 2002 to 52 % in 2007 and then declined to 40 % in 2010. As for distribution, the export embodied carbon emission of the following industries such as machinery and equipment manufacturing, metal products manufacturing industry, chemical industry, textile, clothing and leather products manufacturing industry ranked the highest. According to the calculation and analysis of the main driving factors of embodied carbon growth, we analyzed the structure effect, scale effect and technological effect’s influence on embodied carbon growth, respectively. We also calculated the trade competitiveness index of 17 export industries. Through research, we found that the products with strong international competitiveness belong to high-carbon-emission categories, which was the main reason of high carbon emission in China export. Finally, we proposed related policy suggestions to promote China’s export trade structural readjustment and optimization and China’s low carbon development in export.

     

基于二分法的地震波初至自动拾取算法

初至拾取是地震资料处理中最基本的环节,随着地震资料的增多,自动拾取算法越来越重要,它将严重的影响地震资料处理的速度和效率.本文给出一种新的初至自动拾取算法,它根据参考初至(理论估计的初至),利用二分法和改进的能量比方法检测初至并去除不准确点,通过微调获取波峰、波谷、起跳点三种不同的初至类型.通过对不同信噪比的实际地震数据进行测试,本算法具有快速准确的特点.随着资料信噪比的降低,本算法未能完全解决拾取准确度降低的问题.然而通过适当调整算法的参数,本算法的结果比商用软件OMEGA的初至自动拾取效果要好.     

Simulation and Prediction of the Fluorides Migration in a Tailing Pond Using Modflow

The hydrogeological generalized model of a tailing pond in Qian’an was established. Based on this model, the migration rules of the fluorides in the study area were subjected to the fully implicit difference method of Visual Modflow software (MT3DMS). The study indicates that the direction of fluorides migration is consistent with the direction of the stream flow generally, and the concentration of the fluorides decreases with the increase of the migration distance. The simulation results can provide scientific bases for the assessment and management of the underground water in the contaminated zone.