two layer ballast是什么意思

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This paper makes a brief introduction to positioning and permeable environment forming of the ring suspension sand core,It can provide some experience on the reasonable choice of technological parameters and the dynamic quality control for the sand casting of large ZL201 alloy thin-wall worm-shell parts with two-layer flow path.

概述了全包悬空环形砂芯的定位和透气环境的形成途径；从工艺参数的合理选择和现场动态质量控制上，为ZL201合金双层流道大面积薄壁蜗壳类铸件的砂型铸造成形积累了经验。

This paper analyzes the forced state of surrounding rock and tunnel lining in every step of the construction project for Fu longping double-decked tunnel.

采用二维弹塑性有限元法,分析了在两种施工方案下伏龙坪双层隧道各个施工阶段围岩和衬砌的受力状态,考虑材料的非线性特征,采用Mohr-Coulomb屈服准则及其关联流动法则,采用切线刚度迭代法求解平衡方程,对超过屈服点的应力进行应力调整。

2D elasto-plastic finite element method is adopted to analyze the forced state of the surrounding rock and the tunnel lining in every step of the construction project for Fulongping double-decked tunnel.

采用二维弹塑性有限元法,分析了在该施工方案下伏龙坪双层隧道各个施工阶段围岩和衬砌的受力状态,考虑材料的非线性特征,采用Mohr Coulomb屈服准则及其关联流动法则,采用切线刚度迭代法求解平衡方程,对超过屈服点的应力进行应力调整。

Study on construction technology of sole hole double deck tunnel in underground railway

地下铁道单洞双层隧道施工技术研究

Comparison and Study of Construction Methods Of Fu Longping Double-decked Tunnel In Nanshan of Lanzhou;

兰州南山伏龙坪双层隧道施工方案比选与研究

Analysis of Double-deck Tunnel Dynamic Response under the Train Load in the Subway

地铁列车荷载作用下双层隧道的动力响应分析

Construction Technology and Mechanical Behavior Study on Twin-Arch and Double-Deck City Tunnel of Low-Burying;

城市浅埋双连拱双层隧道施工技术及力学行为研究

The Influencing Factor of the Temperature Field of Cross-passage Construction by Freezing Method in Double-Deck Road Tunnels

双层越江隧道联络通道冻结法温度场影响因素

Electronic transport properties of the multilayer structure double spin-filter tunnel junction

多层结构双自旋过滤隧道结中的电子输运特性

Tray Buries Weak Stratum Diplonema Major Diameter Tunnel Risk Control Technique

浅埋软弱地层双线大直径隧道风险控制技术

He suggested that a double railway-tunnel should be built.

他提议建一条双轨隧道，

Construction Technics Control and Optimization of Double-Arch Tunnels in Complicated Geology Conditions;

高速公路复杂地层双联拱隧道施工工艺控制与优化

Study of Effect of Tunnel Excavation with the Glass Method on the Stability of Artificail Fill Layer

隧道双侧壁导洞法施工对人工填土地层稳定性的影响研究

Comparative Analysis on the Adaptability of CRD and Dual Sidewall Guide Pit for Passing through the Sand Layer of Xiamen Xiangan Seabed Tunnel

厦门翔安海底隧道CRD法和双侧壁法穿越砂层对比分析

The Model Study of Optimal Selection between Double-Arch Tunnel and Separated Tunnel Projects;

双连拱隧道与分离式隧道优选模型研究

The design and construction suggestions of bidirectional six lanes double-arch tunnel

双向六车道连拱隧道设计与施工建议

Study on Construction Technology of Double-block Ballastless Track in tunnel

隧道内双块式无碴轨道施工技术研究

Research on Layer 2 Tunneling Protocols and Implementation of L2TPv3 Data Layer;

二层隧道协议研究及L2TPv3数据层的实现

The Theoretical Research about the Tunneling Magnetoresistance in Double Spin Filter Tunnel Junctions;

双自旋过滤隧道结中的隧穿磁电阻的理论研究

Study on Polarization and Tunneling Magnetoresistance about Double Tunnel Junctions

双隧道结中极化率和隧穿磁电阻的研究

The deposition mechanism is based on the tunneling of electron transition and double electrical layer of interface between semiconductor and electrolyte.

电沉积过程中薄膜的生长机理是基于电子跃迁的隧道效应和半导体／解液界面的双电层结构。