平行顶管相互影响关系研究
发布时间：2019-06-06 00:58
【摘要】：随着经济社会的快速发展,平行顶管的施工越来越广泛。本文的研究主要针对平行顶管施工中的相互影响,具体研究内容如下:(1)对平行顶管相互影响的机理进行了研究,包括:平行顶管施工过程中先行管、土体与后行管三者之间的相互响应关系;受扰动后土体的应力状态变化;不同施工因素对平行顶管施工过程中土体沉降的影响等。(2)对平行顶管引起土体沉降的Peck计算公式进行了总结归纳,并在叠加法的基础上提出了Peck扰动因子修正公式,该公式经实践证明应用效果较好。(3)使用有限元软件Midas/GTS NX对平行顶管施工过程进行了三维模拟,分析了施工过程中土体的应力应变状态;同时,对比分析了不同管间距、管道埋深、管径条件下土体沉降曲线的变化规律,得出了如下结论:(1)平行顶管施工中先行管对后行管的扰动更较大,最终地表竖向沉降曲线轴线偏向先行管;(2)平行顶管随着管间距的增加,地表土体沉降曲线的形状由较近时的“V”形向“U”形过渡,最终逐步转变为“W”形;(3)平行顶管随着管道埋深的增加,地表土体最大沉降值减小,地表沉降曲线形状变宽,范围变大,由“窄而深”向“宽而浅”转变,但其位移云图的对称性保持不变;(4)平行顶管随着管径增大,管周土体的损失与注浆区增大,地表沉降增大。地表沉降曲线的轴线偏向管径较大的管道一侧。(4)结合平行顶管工程地表沉降监测数据,分别进行了Peck理论计算与Midas/GTS NX数值模拟研究,并对三者进行了对比分析,验证了理论公式与三维数值模拟研究的正确性。
[Abstract]:With the rapid development of economy and society, the construction of parallel pipe jacking is more and more extensive. The research of this paper mainly aims at the interaction in parallel pipe jacking construction, the concrete research contents are as follows: (1) the mechanism of parallel pipe jacking interaction is studied, including: the advance pipe in the process of parallel pipe jacking construction, The response relationship between soil and backward pipe; The stress state of soil changes after disturbance; The influence of different construction factors on soil settlement in the process of parallel pipe jacking construction is summarized. (2) the Peck formula of soil settlement caused by parallel pipe jacking is summarized and summarized, and the modified formula of Peck disturbance factor is put forward on the basis of superposition method. The application effect of the formula is proved to be good by practice. (3) the 3D simulation of parallel pipe jacking construction process is carried out by using the finite element software Midas/GTS NX, and the stress and strain state of soil during the construction process is analyzed. At the same time, the variation law of soil settlement curve under different pipe spacing, pipeline buried depth and pipe diameter is compared and analyzed, and the following conclusions are drawn: (1) the disturbance of advance pipe to backward pipe is greater in parallel pipe jacking construction. Finally, the axis of the vertical settlement curve of the surface deviates to the leading pipe. (2) with the increase of pipe spacing, the shape of settlement curve of surface soil changes from "V" shape to "U" shape, and finally gradually changes to "W" shape; (3) with the increase of pipeline buried depth, the maximum settlement value of surface soil decreases, and the shape and range of surface subsidence curve become wider and wider, which changes from "narrow and deep" to "wide and shallow", but the symmetry of displacement cloud map remains unchanged. (4) with the increase of pipe diameter, the loss of soil and grouting area around the pipe increases, and the surface subsidence increases. The axis of the surface subsidence curve deviates to the side of the pipeline with large diameter. (4) combined with the monitoring data of the surface subsidence of the parallel pipe jacking project, the Peck theoretical calculation and Midas/GTS NX numerical simulation are carried out respectively, and the three are compared and analyzed. The correctness of the theoretical formula and three-dimensional numerical simulation is verified.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3
，
本文编号：2493947
[Abstract]:With the rapid development of economy and society, the construction of parallel pipe jacking is more and more extensive. The research of this paper mainly aims at the interaction in parallel pipe jacking construction, the concrete research contents are as follows: (1) the mechanism of parallel pipe jacking interaction is studied, including: the advance pipe in the process of parallel pipe jacking construction, The response relationship between soil and backward pipe; The stress state of soil changes after disturbance; The influence of different construction factors on soil settlement in the process of parallel pipe jacking construction is summarized. (2) the Peck formula of soil settlement caused by parallel pipe jacking is summarized and summarized, and the modified formula of Peck disturbance factor is put forward on the basis of superposition method. The application effect of the formula is proved to be good by practice. (3) the 3D simulation of parallel pipe jacking construction process is carried out by using the finite element software Midas/GTS NX, and the stress and strain state of soil during the construction process is analyzed. At the same time, the variation law of soil settlement curve under different pipe spacing, pipeline buried depth and pipe diameter is compared and analyzed, and the following conclusions are drawn: (1) the disturbance of advance pipe to backward pipe is greater in parallel pipe jacking construction. Finally, the axis of the vertical settlement curve of the surface deviates to the leading pipe. (2) with the increase of pipe spacing, the shape of settlement curve of surface soil changes from "V" shape to "U" shape, and finally gradually changes to "W" shape; (3) with the increase of pipeline buried depth, the maximum settlement value of surface soil decreases, and the shape and range of surface subsidence curve become wider and wider, which changes from "narrow and deep" to "wide and shallow", but the symmetry of displacement cloud map remains unchanged. (4) with the increase of pipe diameter, the loss of soil and grouting area around the pipe increases, and the surface subsidence increases. The axis of the surface subsidence curve deviates to the side of the pipeline with large diameter. (4) combined with the monitoring data of the surface subsidence of the parallel pipe jacking project, the Peck theoretical calculation and Midas/GTS NX numerical simulation are carried out respectively, and the three are compared and analyzed. The correctness of the theoretical formula and three-dimensional numerical simulation is verified.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3
，
本文编号：2493947
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