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Geotechnical site characterization in the greater Memphis area using cone penetration tests

机译：使用圆锥体渗透测试表征大孟菲斯地区的岩土工程位置

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The determination of seismic ground hazards in Memphis and Shelby County, Tennessee is facilitated by the use of electronic cone penetration tests that can provide up to four independent readings with depth from a single sounding. One series of soundings is being performed for site-specific mapping to determine the presence and extent of potentially-liquefiable sediments, in-situ soil resistance to liquefaction, and initial soil stiffness for ground motion amplification studies. Another series of soundings is being conducted in conjunction with field paleoliquefaction mapping in the New Madrid seismic zone to better define the intensity, magnitude, and geographic extent of ground failures caused by large past earthquake events, as well as information about the source sands. In this paper, an overview is given on the types of multi-channeled penetrometer data that are being collected, including vertical profiles of cone tip stress (q_t), sleeve friction (f_s), penetration porewater pressure (u_1 or u_2), downhole shear wave velocity (V_s), and/or electrical conductivity (k_e) Representative soundings are presented from select sites to illustrate repeatability, data post-processing methods, and that derived downhole V_s profiles are generally in good agreement with non-invasive surface techniques at two Memphis test sites. Cyclic stress based procedures for liquefaction are discussed with relation to data from a paleoliquefaction site in Germantown. Tennessee, and estimates of the minimum magnitude of the historic event are discussed. While estimates of the earthquake magnitude are preliminary pending additional study on attenuation relationships and site response in the deep soils of the Mississippi Embayment, it is inferred from evaluation of in-situ test data using cyclic stress based techniques that the December 1811 New Madrid earthquake was likely larger than a M_w = 7.5 event.
机译：通过使用电子锥体穿透测试，可以确定田纳西州孟菲斯和谢尔比县的地震地面危害，该测试可以通过一次探测提供多达四个独立的深度读数。正在针对一系列特定地点进行测绘，以确定潜在可液化沉积物的存在和程度，原位土壤对液化的抵抗力以及用于地面运动放大研究的初始土壤刚度。正在与新马德里地震带中的现场古液化测绘一起进行另一系列的测深，以更好地定义过去发生的大型地震事件造成的地面破坏的强度，大小和地理范围，以及有关源砂的信息。本文概述了正在收集的多通道渗透计数据的类型，包括锥顶应力（q_t），套管摩擦力（f_s），渗透孔隙水压力（u_1或u_2），井下剪切的垂直剖面波速（V_s）和/或电导率（k_e）从选定的位置给出了代表性的测深图，以说明可重复性，数据后处理方法，并且得出的井下V_s剖面通常与非侵入性地面技术在两个方面具有很好的一致性孟菲斯的测试地点。讨论了基于循环应力的液化程序，并与来自Germantown的古液化站点的数据相关。田纳西州，以及历史事件的最小程度的估计进行了讨论。虽然对地震震级的估计尚待进一步研究，以进一步研究密西西比河深处土壤的衰减关系和场地响应，但从基于循环应力技术的现场测试数据评估中可以推断，1811年12月的新马德里地震是可能大于M_w = 7.5事件。

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