瑞雷波法和地质雷达法在查找填埋垃圾充填边界中的综合应用

介绍了瑞雷波法和地质雷达法的基本原理、野外工作方法等,通过瑞雷波法和地质雷达法在查找实际工程填埋垃圾充填边界中的综合应用,查明了垃圾填埋场充填边界的分布位置、分布形态等,并通过对比分析同时结合钻探验证结果综合反映了这两种方法的探测结果具有较好的一致性,从而证明了采用瑞雷波法和地质雷达法的综合探测手段查找垃圾填埋场充填边界是有效的、可靠的,探测结果为下一步勘察设计提供了可靠的地质依据及地球物理参数,为今后其它同类的勘探工程实际资料解释积累了经验。     

泰州引江河高港二线船闸输水系统布置及水力计算分析

结合高港二线船闸工程具体条件,按照《船闸输水系统设计规范》的要求,研究确定了船闸短廊道和三角门门缝联合输水的输水系统型式及具体布置方案,计算分析了充泄水阀门开启方式,通过建立船闸联合输水数学模型计算了闸室输水水力特性.结果表明,确定的船闸输水系统布置及阀门开启方式是合适的,相关水力指标满足规范及设计要求;设计的消能工布置适合高港二线船闸工程特点,可获得较好的闸室水流条件;同时根据水力特性计算结果提出了阀门启闭系统设计建议.     

渠江富流滩船闸输水系统水力学模型试验

富流滩船闸改扩建工程是渠江广安航运建设工程的重要组成部分,对促进川东地区经济社会发展具有重要意义.由于新建船闸等级及综合水力指标较高,因此,需对其进行水力学模型试验以优化输水系统设计.根据初步设计的富流滩船闸输水系统,通过1∶25的整体物理模型试验对其输水水力特性进行详细研究.试验结果表明:富流滩船闸采用闸底长廊道侧支孔明沟消能的输水系统布置是合理的,推荐的阀门开启方式下各输水水力特征均满足设计和规范要求.     

考虑填充墙作用的框架结构Pushover分析

通过对"汶川地震"中框架填充墙的破坏情况进行调查分析,给出了框架填充墙的主要破坏形式,并总结发生破坏的原因;针对砌体填充墙框架结构在地震作用下的受力特点,提出结构简化计算模型(框架-斜撑模型),利用等效轴向刚度推导出斜撑宽度;结合实际工程,采用框架-斜撑模型对已建的框架填充墙结构进行Pushover分析,对结构的抗震能力做出评估。结果表明:①填充墙消耗了大量的地震能量,对周边部分构件起到了保护作用;②填充墙的参与,改变了结构的受力状态,结构薄弱部位也发生了变化。     

FLOW REGIMES BELOW AERATORS FOR DISCHARGE TUNNELS

The flow regimes below an aerator influence directly the air entrainment and the cavitation damage control. Based on the theoretical considerations, the experiments of the aerator for a discharge tunnel were conducted, and the relationships between the flow regime and hydraulic and geometric parameters were investigated. The results showed that, there are two kinds of threshold values for the flow regime conversions. One is1-2Fr standing for the conversion from the fully filled cavity to the partially filledcavity, and the other is2-3Fr which shows the change from the partially filled cavity to the net air cavity. Two empirical expressions were obtained for the conversions of the flow regimes, which can be used in the designs of the aerators.     

管道无压流的过流能力研究

利用数学极值理论分析了管道无压流最大过流量、最大流速的发生工况,并建立了最大过流量、最大流速与管线纵坡、管径、管道糙率的关系表达式,为管道设计提供参考和依据。     

围海工程水力充填工艺堵口截流技术进展

水力充填工艺用于围海造地工程建设,具有成本低、效率高等优点,近15年来被广泛使用,但用于堵口截流仍存在着较高风险。以上海地区多个已建大型工程为案例,对水力充填工艺堵口截流技术进行归纳和总结,以期对该技术的成功应用和进一步发展、突破起到一定的引导和促进作用。     

Bending stress of rolling element in elastic composite cylindrical roller bearing

A new structure design method of elastic composite cylindrical roller bearing is proposed, in which PTFE is embedded into a hollow cylindrical rolling element, according to the principle of creative combinations and through innovation research on cylindrical roller bearing structure. In order to systematically investigate the inner wall bending stress of the rolling element in elastic composite cylindrical roller bearing, finite element analysis on different elastic composite cylindrical rolling elements was conducted. The results show that, the bending stress of the elastic composite cylindrical rolling increases along with the increase of hollowness with the same filling material. The bending stress of the elastic composite cylindrical rolling element decreases along with the increase of the elasticity modulus of the material under the same physical dimension. Under the same load, on hollow cylindrical rolling element, the maximum bending-tensile stress values of the elastic composite cylindrical rolling element after material filling at 0° and 180° are 8.2% and 9.5%, respectively, lower than those of the deep cavity hollow cylindrical rolling element. In addition, the maximum bending-compressive stress value at 90° is decreased by 6.1%.     

Investigation on mechanism of polymer filling in high-aspect-ratio trenches for through-silicon-via (TSV) application

Vacuum-assisted spin-coating is an effective polymer filling technology for sidewall insulating of through-silicon-via (TSV). This paper investigated the flow mechanism of the vacuum-assisted polymer filling process based on experiments and numerical simulation, and studied the effect of vacuum pressure, viscosity of polymer and aspect-ratio of trench on the filling performance. A 2D axisymmetric model, consisting of polymer partially filled into the trench and void at the bottom of trench, was developed for the computational fluid dynamics (CFD) simulation. The simulation results indicate that the vacuum-assisted polymer filling process goes through four stages, including bubble formation, bubble burst, air elimination and polymer re-filling. Moreover, the simulation results suggest that the pressure significantly affects the bubble formation and the polymer re-filling procedure, and the polymer viscosity and the trench aspect-ratio influence the duration of air elimination.     

废旧聚乙烯填充改性研究进展

介绍了废旧聚乙烯改性再生的必要性并从无机粒子填充改性、纤维增强改性和弹性体增韧改性三个方面综述了国内外对废旧聚乙烯的填充改性的情况.