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        Tunnel Bottom Cavity Laws of Heavy-Haul Railway Tunnel under Train Load and Groundwater in Weak Surrounding Rock Condition

        Ziqiang Li,Zheng Li,Weiwei Huang,Zhifan Xu,Wengang Zhang,Kunping Chen 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3

        This work aimed to study the cavity mechanism of surrounding rock at the bottom of a tunnel under the combined action of heavy-haul train load and groundwater. The study location was the Taihangshan Mountain Tunnel in Wari Railway, which is the first tunnel in China, constructed according to the 30 tons heavy-haul railway standards. Based on the water and soil pressure data measured in previous, the surrounding rock deterioration range and depth at the bottom of the heavy-haul railway tunnel under different axle loads and surrounding rock conditions were analysed by using a combination of laboratory test and discrete element method. The results showed objective defects in the bottom surrounding rock that appeared after the construction was completed, which provided a channel for groundwater. The groundwater flushed the surrounding rock at the bottom of the heavy-haul tunnels as time passed, and the dynamic action of heavy-haul trains caused the surrounding rock particles to gradually become loose, which was especially noticeable for the defect location in the weak surrounding rock. An increase in the axle load and a deterioration in the surrounding rock condition could aggravate the tunnel bottom cavity. The findings can be used to generate ideas for defects prediction and treatment methods for heavy-haul railway tunnels.

      • The Research and Application of Multiple Spindle Dynamic Follow to Improve CNC Thread Milling Products Precision

        Peng Xiao,Zhiyi Zhang,Wengang Zheng 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8

        In this paper, a new control method is proposed. The SIEMENS 828D control system reads a feed axis machining of any one time processing, calculates the axis displacement data and draws the other two related linkage axis machining data. it through the PLC program of the control system written way R parameter is assigned to the other two related linkage of shaft processing program. Dynamic following effect of forming milling thread machining, reduce the product processing error, improve the product processing precision, technical indicators satisfy the similar foreign products.

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