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Estimating free field seismic settlement history in a saturated layered soil profile
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-09-02 , DOI: 10.1016/j.soildyn.2021.106937
Nima Mojtahedzadeh 1 , Raj Siddharthan 1
Affiliation  

Existing methods proposed for estimating the earthquake-induced one-dimensional free-field settlement in saturated soil, focus on the post-liquefaction permanent volumetric strain. These methods rely on undrained cyclic laboratory tests that subject the sandy samples to uniform cycles. A new method is presented to estimate the free-field one-dimensional settlement histories induced by random base motions. This approach uses an existing incremental volumetric strain model to determine the settlement history before and after liquefaction. The shear strain history of a layered profile was obtained from an effective stress-based response analysis available as an option in DEEPSOIL and was subsequently used as an input to the proposed method. A simple two-parameter porewater pressure generation model available in DEEPSOIL was employed. This model, which is capable of simulating strain-softening, was calibrated to an existing probabilistic liquefaction potential curve and acceptable rate of porewater pressure generation. The proposed method was then used to calculate the settlements at the Marina District after the 1989 Loma Prieta earthquake, at Port Island after the 1995 Kobe earthquake, and at 6 different sites located within Christchurch and Ferrymead after the 2011 Christchurch earthquake. The estimated settlements were compared to the measured values along with those estimated by existing methods.



中文翻译:

估计饱和层状土壤剖面中的自由场地震沉降历史

现有的估计饱和土壤中地震引起的一维自由场沉降的方法主要集中在液化后的永久体积应变上。这些方法依赖于不排水的循环实验室测试,这些测试使沙质样品经受均匀的循环。提出了一种估计由随机基础运动引起的自由场一维沉降历史的新方法。这种方法使用现有的增量体积应变模型来确定液化前后的沉降历史。分层剖面的剪切应变历史是从有效的基于应力的响应分析中获得的,可作为 DEEPSOIL 中的一个选项,随后用作所提出方法的输入。使用了 DEEPSOIL 中可用的简单的双参数孔隙水压力生成模型。这个模型,能够模拟应变软化,根据现有的概率液化势曲线和可接受的孔隙水压力生成速率进行校准。该方法随后用于计算 1989 年洛马普列塔地震后滨海区、1995 年神户地震后港口岛以及 2011 年基督城地震后位于基督城和费里米德内的 6 个不同地点的定居点。将估计的沉降与测量值以及通过现有方法估计的值进行比较。该方法随后用于计算 1989 年洛马普列塔地震后滨海区、1995 年神户地震后港口岛以及 2011 年基督城地震后位于基督城和费里米德内的 6 个不同地点的定居点。将估计的沉降与测量值以及通过现有方法估计的值进行比较。该方法随后用于计算 1989 年洛马普列塔地震后滨海区、1995 年神户地震后港口岛以及 2011 年基督城地震后位于基督城和费里米德内的 6 个不同地点的定居点。将估计的沉降与测量值以及通过现有方法估计的值进行比较。

更新日期:2021-09-02
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