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The evaluation on shock absorption performance of buffer layer around the cross section of tunnel lining

机译：隧道衬砌横截面周围缓冲层减震性能评价

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摘要

The buffer layer around the cross section of lining structure would be the most simple and effective shock absorption measure, which can cut off the transferring paths of adverse effects from surrounding rock to lining structures. Meanwhile, it can reduce the seismic action intensity and minimize the extra pressure from surrounding rock by changing seismic acting patterns. This paper presents outcomes by investigating the interaction between lining structure and surrounding rock during excitation as well as deriving influencing parameters with regard to shock absorption performances of buffer layer. Afterwards, series numerical calculations are systematically carried out with attention given to the seismic-induced deformation responses of rock-layer-lining system. Finally, an elaborated evaluation method for assessing shock absorption performance of buffer layer with an evaluation expression is proposed, which is validated by series shaking table model tests and numerical simulations. This evaluation expression would be able to guide the selection and construction of buffer layer according to the geological conditions and construction circumstances by changing geometric and material parameters. The evaluation result would have uniqueness once all the parameters are confirmed. From this expression and its derivation process, the following findings can be drawn: (1) The cross section of tunnel has the identical particular deformation pattern in each constructing phase during excitation regardless of the existence of lining structure and buffer layer, that is, the two orthogonal diagonal diameters of cross section alternatively expand and contract. (2) The geometric and material parameters simultaneously determine the shock absorption performances of buffer layer, which grows in direct proportion to geometric variables but decreases in inversely proportion to material variables. (3) When the ratio of lining inside radius to buried depth is equal to 0.2 (i.e. r(0)/H = 0.2), the buried depth of tunnel engineering should be the ideal position for adopting buffer layer. Meanwhile, when the ratio of buffer layer thickness to lining inside radius is equal to 0.2 (i.e. t(b)/r(0) = 0.2), it can be confirmed the optimal thickness of buffer layer. (4) The evaluation expression of shock absorption performance is independent of seismic waveforms but involved in the excitation intensities and the destruction states of lining structure.
机译：衬砌结构横截面周围的缓冲层是最简单有效的减震措施，可以切断不良影响从围岩到衬砌结构的传递路径。同时，通过改变地震作用模式，降低地震作用强度，最小化围岩的额外压力。本文通过研究衬砌结构与围岩在激励过程中的相互作用，推导缓冲层减震性能的影响参数，给出了研究结果。然后，系统地进行了系列数值计算，并研究了岩层衬砌系统的地震引起的变形响应。最后，提出了一种基于评价表达式的缓冲层减震性能评价方法，并通过串联振动台模型试验和数值模拟进行了验证。该评价表达式能够根据地质条件和施工情况，通过改变几何和材料参数来指导缓冲层的选择和施工。一旦确认了所有参数，评估结果将具有唯一性。从该表达式及其推导过程可以得出以下结论：（1）无论是否存在衬砌结构和缓冲层，隧道的截面在激励过程中各施工阶段都具有相同的特定变形模式，即截面的两个正交对角线直径交替膨胀和收缩。（2）几何参数和材料参数同时决定了缓冲层的减震性能，缓冲层与几何变量成正比增长，与材料变量成反比减小。（3）当衬砌内半径与埋深之比为0.2（即r（0）/H=0.2）时，隧道工程埋深应为采用缓冲层的理想位置。同时，当缓冲层厚度与内衬半径之比等于0.2（即t（b）/r（0）=0.2）时，可以确定缓冲层的最佳厚度。（4）减震性能的评价表现形式与地震波形无关，但涉及衬砌结构的激励强度和破坏状态。

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