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Regional subsidence effects on seismic soil-structure interaction in soft clay

机译：区域沉降对软黏土地震土-结构相互作用的影响

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摘要

Regional subsidence effects on dynamic soil properties and ground layering deformation are often ignored in practice, when dealing with seismic soil-structure interaction analyses. Nevertheless, these effects can substantially change the frequency content and spectral accelerations in both free field and in the soil-structure system. Pore pressure variations over the project economic life are due to both regional subsidence as well as dissipation of excess pore pressure caused by the structure weight. These variations lead to changes in effective stresses, which in turn, modify the dynamic properties such as shear wave velocity distribution and modulus degradation and damping curves, as well as soil layer thickness and shape. These changes can be substantial in highly compressible very soft clay, such as that found in Mexico City valley. This paper presents a numerical study on the seismic response of a conventional five-story building supported by a compensated box foundation built in soft clay, considering these effects. Three-dimensional finite difference models were developed with the software FLAC(3D). Initially, the evolution of effective stresses with pore pressure was established based on in-situ piezometer measurements of an instrumented site, and laboratory data. Then, changes in dynamic properties were taken into account based on the results gathered from series of resonant column tests conducted for several effective consolidation stresses, and a PS suspension logging test. The static behavior of the soil-structure system was assessed. For the cases studied herein, the complex interplay between soil nonlinearities, which lead to fundamental period elongation of the soil deposit, T-p, and the overall tendency of ground consolidation to shorten it, controls the variations in the spectral ordinates depending on how close T-p is of the predominant period of the excitation.
机译：在处理地震土-结构相互作用分析时，在实践中常常忽略区域沉降对动力土壤特性和地层变形的影响。然而，这些影响会大大改变自由场和土壤结构系统中的频率含量和频谱加速度。项目经济寿命期间的孔隙压力变化是由于区域沉降以及结构重量导致的多余孔隙压力消散所致。这些变化导致有效应力的变化，从而改变了动态特性，例如剪切波速度分布，模量衰减和阻尼曲线，以及土层厚度和形状。在高度可压缩的非常软的粘土中，例如在墨西哥城山谷中发现的粘土，这些变化可能很大。考虑到这些影响，本文针对由软土建造的补偿箱式基础支撑的常规五层建筑物的地震响应进行了数值研究。使用软件FLAC（3D）开发了三维有限差分模型。最初，有效压力随孔隙压力的变化是基于仪器位置的原位压电计测量值和实验室数据确定的。然后，基于对一系列有效固结应力进行的一系列共振柱测试以及PS悬浮测井测试所获得的结果，将动力特性的变化考虑在内。评估了土壤结构系统的静态行为。对于本文研究的情况，土壤非线性之间的复杂相互作用（导致土壤沉积物Tp的基期延长）和地面固结的总体趋势使其缩短，这取决于Tp的接近程度来控制光谱坐标的变化。激发的主要周期

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