Stability analysis of the open-pit mine slope and the study on the incensement of the slope angle

Based on the exploration of the engineering geology and the rock mechanics testing, limit equilibrium analysis method was adopted to calculate the stability of the Huogeqi Copper Mine slope, the results show that the original slope angle is too conservative and the slope have the potential of more preferable slope angle. In order to discuss the possibility of slope angle enhancement, sensitivity analysis of parameters related to limit state slope was made. Quantitatively determined angle value of the adding and the optimal slope angle was obtained. The study having performed showed that it is not only useful for the safety control of open-pit mine slope but also for the open-pit mine design for the similar geological condition.     

不同气候条件下典型城市的体育馆 自然通风模拟及潜力分析

对夏热冬暖与温和气候条件下的典型城市体育馆进行了自然通风数值模拟及潜力分析。首先,对两种气候条件中的典型城市体育馆进行了自然通风数值模拟;然后,通过对比不同地区典型城市夏季、冬季和过渡季节的气流组织和舒适性分布情况,提出了合理的风压驱动自然风设计策略;最后,对不同气候条件中典型性城市的体育馆自然通风进行了潜力分析。     

Evaluation method for expressway rock slope stability based on numerical simulation

Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blasting process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting,and discusses of the blasting vibration influence to the rocky cut slope from many sides.the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and acceleration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the expressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.     

正铲液压挖掘机工作装置的动力学分析与仿真

对一种正铲液压挖掘机进行动力学分析,运用虚功原理对工作装置进行动力学建模。基于Matlab对动力学模型进行数值计算,在给定负载情况下得到了铲斗在挖掘过程中3组液压缸的驱动力变化曲线。利用ADAMS仿真软件对该挖掘机工作装置进行动力学仿真,将仿真得到的结果与计算值进行对比,得到3组液压缸的驱动力误差曲线,误差在合理范围内,证明了动力学建模方法的正确性。     

建筑外墙隔热质感复合涂料的研究

本试验以有机硅丙乳液为主要成膜物质,石英砂为常规质感填料,配以空心玻璃微珠为功能性填料,对质感涂料进行隔热改性增强,研制出一种具有良好隔热反射作用的建筑外墙隔热质感复合涂料。该涂料涂膜具有良好的耐沾污性,不易粉化、变色,具有持久的抗老化性的显著优势,更加适用于外墙的保温系统的配套涂层饰面,符合国家当下所提倡的节能环保的主题和发展趋势。     

驱油用脂肪醇聚氧乙烯醚磺酸盐研究进展

介绍了卤化脂肪醇醚法、烯烃加成法、硫酸酯盐转化法和羟乙基磺酸钠法合成脂肪醇聚氧乙烯醚磺酸盐的路线、工艺特点及优缺点,剖析了其泡沫性能的影响因素,耐温、耐盐耐钙性能的研究现状。脂肪醇聚氧乙烯醚磺酸盐类阴-非离子表面活性剂适用于高温、高矿化度油藏条件的开采,具有常规表面活性剂的多种优良性能,在油田开采中具有广阔的发展空间。     

建筑外墙复合型质感涂料的制备与应用

以改性硅丙乳液复合部分弹性乳液为基料,天然石英砂为主要填料,辅以纳米二氧化硅、纳米抗污助剂、空心玻璃微珠、反射隔热粉、多功能助剂等制成建筑外墙复合型质感涂料,其具有抗污、耐候、超耐久及反射与阻热等性能,外观上形象逼真、高贵质感、色彩丰富,施工简便,是一种新型多功能、高性能、高装饰性建筑外墙涂料。     

三角梅红色素的提取及稳定性研究

报道了三角梅红色素的提取,理化性质及其稳定性;结果表明,该色素水溶性好,75℃以下耐热性好,但从光照来看,对色素的影响先增后减,金属离子对色素有护色增色作用。     

跨河桥梁壅水计算的简化公式法

桥前最大壅水高度通常采用简化公式法计算.本文对D'Aubuioson公式、水力学公式、陆浩公式、曹瑞章公式及李付军公式等常用简化公式进行了全面总结,从公式研制的背景、推导原理和考虑的因素入手,分析了各种方法的适用条件和优缺点,提出了公式应用过程中需注意的问题和解决的途径.     

双环绕丝头

双环绕丝头(如图)是由纱锭加热弯成的两个半圆环、一个定长螺杆和一块扁钢焊接而成的。扁钢尺寸为1O×25×40mm,上圆环半径R_1=15mm,下圆环半径R_2=15+~r