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发布时间:2020-01-06 00:00:00
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水泥混凝土制品

荷载对盾构隧道管片力学性能影响的模拟分析
荷载对盾构隧道管片力学性能影响的模拟分析
  • 覃智泽,韦向高,许显龙
2021年第11期
摘要
引用本文
摘   要:为了解荷载对盾构隧道管片的影响,基于混凝土塑性损伤本构模型,考虑内置钢筋、连接螺栓与管片间的非连续性接触,进行了荷载作用下管片受力破坏全过程的有限元模拟分析,研究了管片混凝土、连接螺栓与内置钢筋的力学性能变化,并探讨了土体抗力系数对管片受力与变形的影响。结果表明:在荷载作用下,管片封顶块与标准块接头内侧张开外侧压紧,邻接块接头外侧张开内侧压紧,管片初始破坏位置处于拱底处内侧,以纵向裂缝为主,最终形成网状裂缝;管片受力与变形受土体抗力系数影响显著,其椭圆度、接头张开量、螺栓、钢筋应力随土体抗力系数的增大而减小。 Abstract: In order to study the influence of load on the existing shield tunnels, the plastic-damage model was adopted to represent the nonlinear characteristics between concrete, built-in steel bars and connectinh bolt. The finite element analysis of the whole failure process under the surface surcharge was carried out, the stress changes of segment concrete, connecting bolts and built-in steel bars were studied, and the influence of soil resistance coefficient on the force and deformation of segment structure was discussed. The results show that the joint between the key block and the standard block is expanded and compressed on the outside, the location of the initial failure of the segment is at the inner surface at the bottom of the haunch, mainly longitudinal cracks, and finally form network cracks. The force and deformation of shield tunnel structure are significantly affected by the soil resistance coefficient. The ellipticity, joint expansion, bolt and steel stress of shield tunnel structure decrease with the increase of soil resistance coefficient.
覃智泽,韦向高,许显龙.荷载对盾构隧道管片力学性能影响的模拟分析[J].混凝土与水泥制品,2021(11):51-54. QIN Z Z,WEI X G,XU X L.Simulation Analysis of Influence of Load on the Mechanical Properties of Concrete Shield Segment[J].China Concrete and Cement Products,2021(11):51-54.
预制混凝土衬砌管片模具自动开合装置的研发
预制混凝土衬砌管片模具自动开合装置的研发
  • 尹怀秀,庄慧显,王彦涛
2021年第11期
摘要
引用本文
摘   要:为提高预制混凝土衬砌管片生产效率,结合自动化生产需要,针对手动开合模存在的不足,研发了自动化开合模装置,并介绍了端模、侧模开合原理及操作步骤,可为提高管片生产线自动化程度提供参考。 Abstract: In order to improve the reinforced concrete segment production efficiency, combined with the needs of automatic production, aiming at the shortcomings of manual mould opening and closing, an automatic mould opening and closing device is developed, and the opening and closing principles and operation steps of end mold and side mould are described respectively, which can provide a reference for improving the automation of segment production line.
尹怀秀,庄慧显,王彦涛.预制混凝土衬砌管片模具自动开合装置的研发[J].混凝土与水泥制品,2021(11):49-50,54. YIN H X,ZHUANG H X,WANG Y T.Research on Automatic Opening and Closing Device of Reinforced Concrete Segment Mould[J].China Concrete and Cement Products,2021(11):49-50,54.
CFRP内衬法加固预应力钢筒混凝土管的内水压力试验研究
CFRP内衬法加固预应力钢筒混凝土管的内水压力试验研究
  • 窦铁生1,程冰清1,2 ,夏世法1,赵丽君1,董晓农1,2
2021年第11期
摘要
引用本文
摘  要:通过内水压力试验,研究了CFRP内衬法加固预应力钢筒混凝土管(PCCP)的结构力学性能和破坏模式,并采用光纤布拉格光栅(FBG)感测技术测试了试验过程中PCCP各层结构和CFRP内衬的变形情况,得到了内水压力作用下PCCP结构的力学响应规律。同时,模拟了在所有预应力失效的情况下,PCCP的力学性能及破坏情况。结果表明,在内水压力为1.8 MPa时,PCCP原管管芯混凝土开裂,而CFRP加固管在加压至1.9 MPa后发生开裂,表明CFRP内衬能够有效增强管芯混凝土的延性,有效延缓管芯混凝土开裂,提高PCCP抗裂性能。同时,CFRP内衬法加固所有预应力失效的PCCP能够承受原设计内水压力,表明CFRP内衬能够恢复受损严重PCCP的承载能力。 Abstract: The mechanical properties and failure modes of PCCP reinforced by CFRP liner were studied through the hydrostatic pressure prototype test of PCCPs. Fiber Bragg Grating (FBG) sensing technology was used to test the deformation of the PCCPs and the CFRP liner during the test, and the mechanical response law of PCCP reinforced by CFRP liner under internal water pressure was obtained. Meanwhile,  the simulation on the failure of extreme cases where all prestress of the PCCP were carried out. The results show that the concrete core of the original pipe cracks when the internal water pressure is 1.8 MPa, while the pipe reinforced by the CFRP liner cracks after the pressure is 1.9 MPa. CFRP liner can enhance the ductility, effectively delay the cracking of the concrete core, and improve the strength and crack resistance of the PCCP. The PCCP without prestress reinforced by CFRP liner can bear the original design internal water pressure, indicating that CFRP liner can restore the original bearing capacity of a PCCP with serious damage. 
窦铁生,程冰清,夏世法,等.CFRP内衬法加固预应力钢筒混凝土管的内水压力试验研究[J].混凝土与水泥制品,2021(11):44-48. DOU T S,CHENG B Q,XIA S F,et al.Study on Hydrostatic Pressure Testing of PCCP Strengthened by CFRP Liner[J].China Concrete and Cement Products,2021(11):44-48.
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