2017年银川盆地1:50000平罗站幅工程地质钻孔及取样土工试验数据集

Dataset of the 1:50000 Pingluo Station Map Sheet Area in the Yinchuan Basin in 2017 - Obtained from Geological Engineering Drilling, Borehole Sampling and Geotechnical Tests

本数据集是作者2017年在银川盆地平罗站幅施工的14个工程地质钻孔岩心中采集的234个岩土样品,经过测试分析后所得的共2 602组测试数据。这些数据主要体现了土体的抗剪强度、压缩模量、颗粒成分等。图幅内第四系分布广泛,厚度大,为区内主要的工程地质岩组,且成因多样,从西到东主要包括:上更新统洪积层,岩性主要为砾石、砂砾石;全新统灵武组细砂土;全新统湖沼积层,岩性主要为淤泥、砂质粘土及粉砂;全新统风积层,岩性主要为土黄色中-细砂、粉砂。其中,全新统灵武组占据了图幅大部分区域,岩性主要为细砂、粉砂、砂质粘土等。钻孔揭示,银川平原区地层纵向上以河湖相细砂、粉砂为主,夹粉质粘土,局部钻孔含卵砾石层。样品测试数据分析显示,图幅区内碎石土、冲积砂土、粘性土具较高的抗剪强度,工程地质条件较好;而图幅西北部砂岩、泥岩由于中等到强风化程度,且有软弱夹层,工程地质条件较差。湖沼积成因的淤泥、砂质粘土及粉砂工程地质性质亦较差。本次图幅区内的工程地质钻探工作施工规范,测试分析均由具备国家资质的实验室承担,得到的数据质量可靠,真实反映了该区域内地层信息及岩土物理力学性质。

This dataset contains 2 602 sets of test data on 234 rock and soil samples collected from the cores of 14 geological engineering boreholes that were drilled in the Pingluo Station map sheet area of Yinchuan Basin (also referred to as "the Area") in 2017. It primarily consists of information about the shear strength, compression modulus and grain composition of soil masses. In the Area, the geological structures of the Quaternary, which is formed by many causes and has a great thickness, compose the main geological engineering formation, since it is widely distributed. From west to east they include:diluvium of the Upper Pleistocene Series, in which gravels and sandy gravels are mainly distributed;fine sandy soil of the Lingwu Formation, Holocene Series;lacustrine sediment of the Holocene Series, throughout which sludge, sandy clay and silty sand are mainly distributed;aeolian deposits of the Holocene Series, in which khaki medium-fine sand and silty sand are mainly distributed. Among these geological structures, the Lingwu Formation of the Holocene Series covers most of the Area and mostly contains fine sand, silty sand and sandy clay. As revealed by the boreholes, vertically, the strata of the plain area of the Yinchuan Basin mainly consist of fine sand and silty sand of fluviatile-lacustrine facies that are interspersed with silty clay, whilst gravel-cobble layers are found in some boreholes. According to analysis of sample testing data, the gravel soil, alluvial sandy soil and cohesive soil in the Area are subject to good geological engineering conditions due to their high shear strength, while the sandstones and mudstones in the northwest suffer from poor geological engineering conditions since they are moderately or strongly weathered and interspersed with weak intercalations. In addition, the sludge, sandy clay and silty sand of lacustrine sedimentary origin also suffer from poor geological engineering conditions. The data obtained for the dataset are credible and can accurately reflect the strata information as well as the physical and mechanical properties of the rock and soil masses in the Area since the geological engineering drilling was conducted in a standardized manner and the tests and analysis were all performed by nationally-certified laboratories.