An approach to measure infill matric suction of irregular infilled rock joints under constant normal stiffness shearing

Rock joints infilled with sediments can strongly influence the strength of rock mass. As infilled joints often exist under unsaturated condition, this study investigated the influence of matric suction of infill on the overall joint shear strength. A novel technique that allows direct measurement of matric suction of infill using high capacity tensiometers (HCTs) during direct shear of infilled joints under constant normal stiffness (CNS) is described. The CNS apparatus was modified to accommodate the HCT and the procedure is explained in detail. Joint specimens were simulated by gypsum plaster using three-dimensional (3D) printed surface moulds, and filled with kaolin and sand mixture prepared at different water contents. Shear behaviours of both planar infilled joints and rough joints having joint roughness coefficients (JRCs) of 8–10 and 18–20 with the ratios of infill thickness to asperity height (t/a) equal to 0.5 were investigated. Matric suction shows predominantly unimodal behaviour during shearing of both planar and rough joints, which is closely associated with the variation of unloading rate and volumetric changes of the infill material. As expected, two-peak behaviour was observed for the rough joints and both peaks increased with the increase of infill matric suction. The results suggest that the contribution of matric suction of infill on the joint peak normalised shear stress is relatively independent of the joint roughness.     

THE FLOW PRODUCED IN PARTICLE-SUSPENSION BY AN INFINITE ROTATING DISK:SERIES SOLUTION

To the flow produced in particle-suspension by a rotating disk of infinite extent,the asymptotic behavior at infinity is analyzed.A corresponding series solution is presented.It isshown that this approach yields widely valid solutions of high accuracy for all the cases in whichthat suction or weak injection at the disk surface exists.For the cases that strong injection or par-ticle-free band exists,the series method fails.     

玻璃钢缓弯弯头模具的设计和制作

本文详细叙述了φ２００×９０°玻璃钢弯头模具的设计和制作方法。     

热焊弯管用钢板工艺探讨

在统计分析、正交多项式回归和模拟试验的基础上，建立了高精度的屈强比预报模型，并运用多元函数极值原理，求导极值点及相应的工艺参数，为优化工艺制度，提高热焊弯管用钢(L360-WG系列)性能合格率提供了定量依据。     

10000m^3内浮顶油罐双浮动吸油装置设计

介绍了某油库扩建工程中10 000 m3内浮顶油罐双DN500浮动吸油装置的结构设计,并对内浮顶罐浮动吸油装置的浮力进行了优化配置,此经验对我国内浮顶油罐浮动吸油装置的设计和使用具有一定的指导意义.     

ON THE SLOW MANIFOLD CHARACTERISTICS OF CAPILLARY SUCTION APPARATUS DYNAMICS

The nonlinear dynamic behaviour relating the wet front size and liquid saturation under inner cylinder (or rectangular cell) in cylindrical (or rectangular) capillary suction apparatus was investigated. The slow manifold explanation was proposed and the fast- and slow-varying variables were identified. Experiments were conducted to verify theoretical findings.     

铜基薄壁热管应用现状及发展趋势

在5G通信技术及消费电子行业快速发展的背景下,铜基薄壁热管被广泛应用于大功率电子设备散热领域。通过介绍目前应用较广的几种热管,对其结构、特点及应用范围进行了对比 ;阐述热管在加工制备和使用过程中存在的一些问题和缺陷,对表面缺陷形成机理进行分析,并对热管未来的发展趋势进行了展望。     

制氢装置弯头爆裂原因及措施

分析了制氢装置中变气蒸汽发生器出口弯头在不到 半年时间内出现两次冲刷减薄爆裂的原因，并提出采取更换材质、扩大管径、控制工艺指标及优化原料等预防措施.     

冰箱门胆真空吸塑成型模具抽芯机构设计

在充分分析斜滑块抽芯机构运动及受力状态的基础上，介绍了一种利用脱模力抽芯的非气动抽芯机构设计方法，采用该方法设计的冰箱门胆吸塑模具结构紧凑、抽芯可靠、生产效率高。