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Rigidity of “Warsaw clay” from the Poznań Formation determined by in situ tests
Open Geosciences ( IF 2 ) Pub Date : 2020-11-05 , DOI: 10.1515/geo-2020-0030
Simon Rabarijoely 1
Affiliation  

Abstract The character of morphogenetic processes occurring within river valleys depends on the mechanical and hydrogeological properties of deposits that build up such landforms. In the case of the Polish Lowlands, a series of Pliocene clay lake sediments (so-called Poznań mottled clays) plays a special role. Their current locations and properties are associated with specific sedimentation conditions and glacitectonic deformations, which the soils have been subjected to many times in Pleistocene. Their presence in the lithological profile influences dynamics of slope processes in valleys’ escarpment zones and channel erosion stabilization. In this article, the “Warsaw clay” from the Poznań Series Formation is presented in comparison with other cohesive Quaternary sediments, which are mostly building neighboring outcrops. This article analyzes the Seismic Dilatometer (SDMT) results and a method of interpretation to determine I R, plasticity index, and liquid limit (LL) parameters. The undrained shear strength S u was determined based on the Cone Penetration Test (CPT), SDMT, and laboratory test results. Spatial variability of the strength and deformation parameters in the study area were determined using dilatometer test (SDMT) results. Finally, the nomogram chart is proposed to obtain the rigidity index (I R) of the preconsolidated Pliocene clays, depending on both p 0 and p 1 pressures from SDMT and effective vertical stress σ v0 ′ {\sigma }_{\text{v0}}^{^{\prime} } and pore water pressure u 0.

中文翻译:

原位测试确定的来自波兹南地层的“华沙粘土”的刚度

摘要 河谷内发生的形态发生过程的特征取决于构成此类地貌的沉积物的机械和水文地质特性。在波兰低地的情况下,一系列上新世粘土湖沉积物(所谓的波兹南斑驳粘土)起着特殊的作用。它们目前的位置和性质与特定的沉积条件和冰川构造变形有关,这些土壤在更新世已经多次受到影响。它们在岩性剖面中的存在会影响山谷陡峭带中斜坡过程的动力学和河道侵蚀的稳定性。在本文中,将来自波兹南系列地层的“华沙粘土”与其他粘性第四纪沉积物进行比较,这些沉积物主要是建立邻近的露头。本文分析了地震膨胀仪 (SDMT) 结果以及确定 IR、塑性指数和液限 (LL) 参数的解释方法。不排水剪切强度 S u 是根据锥入度测试 (CPT)、SDMT 和实验室测试结果确定的。使用膨胀计测试 (SDMT) 结果确定研究区域中强度和变形参数的空间变异性。最后,提出了列线图来获得预固结的上新世粘土的刚度指数 (IR),这取决于来自 SDMT 的 p 0 和 p 1 压力以及有效垂直应力 σ v0 ′ {\sigma }_{\text{v0} }^{^{\prime} } 和孔隙水压力 u 0。不排水剪切强度 S u 是根据锥入度测试 (CPT)、SDMT 和实验室测试结果确定的。使用膨胀计测试 (SDMT) 结果确定研究区域中强度和变形参数的空间变异性。最后,提出了列线图来获得预固结的上新世粘土的刚度指数 (IR),这取决于来自 SDMT 的 p 0 和 p 1 压力以及有效垂直应力 σ v0 ′ {\sigma }_{\text{v0} }^{^{\prime} } 和孔隙水压力 u 0。不排水剪切强度 S u 是根据锥入度测试 (CPT)、SDMT 和实验室测试结果确定的。使用膨胀计测试 (SDMT) 结果确定研究区域中强度和变形参数的空间变异性。最后,提出了列线图来获得预固结的上新世粘土的刚度指数 (IR),这取决于来自 SDMT 的 p 0 和 p 1 压力以及有效垂直应力 σ v0 ′ {\sigma }_{\text{v0} }^{^{\prime} } 和孔隙水压力 u 0。
更新日期:2020-11-05
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