银川盆地1:50000芦花台幅工程地质钻孔及取样土工试验数据集

Luhuatai in the Yinchuan Basin for the 1:50 000 Map:Dataset from Engineering Geology Boreholes,Samples and Geotechnical Tests

本数据集包含了2016年从银川盆地1:50 000芦花台图幅区内采集的14个工程钻孔的数据信息,293个岩土样品共1 996组测试数据。主要测试土体抗剪强度、压缩模量、颗粒成分等。图幅区内出露的地层主要为第四系。经钻孔揭露,纵向上岩土类型从地表至深部依次为砂砾石土、粉细砂、粉土和粉质粘土等;横向上,西部以洪积成因的砂砾石为主,东部以冲积和风积成因的粉细砂为主;整体上表现出由西向东地层时代变新,岩性颗粒由粗变细的总体特征。样品测试显示,图幅区内砂砾石、粘性土具有较高的抗剪强度,工程地质特性较好;而图幅东部区域的风成粉细砂土因胶结差,结构较分散,易出现砂土液化现象而呈现出较差的工程地质特性。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。本数据集的数据和分析结论,可以为研究银川盆地的地质演化及在该区开展工程建设规划提供参考。

This dataset contains 1 996 sets of test data,obtained from 293 rock and soil samples collected from 14 engineering boreholes drilled in Luhuatai,Yinchuan Basin,in 2016.The test items include the shear strength,modulus of compressibility and grain composition of the soil mass.The exposed strata in Luhuatai is predominantly Quaternary.The boreholes reveal that,vertically,the rocks/soils are sandy gravel,fine silty sand,silty soil and silty clay,respectively,from the surface downwards;and horizontally,the western area is dominated by diluvial sand while the eastern area is mainly alluvial and eolian fine silty sand.Generally,the characteristic of the area is that the rock tends to young with finer lithological particles from west to east.The sample tests indicate that the sand and cohesive soil in Luhuatai possess high shear strength and ideal engineering geology characteristics.However,the eolian fine silty sand in the eastern area exhibits poor engineering-geological characteristics because it is prone to liquefaction of sandy soil due to poor cementation and a dispersed structure.The engineering geology drilling in Luhuatai is performed according to related specifications,where tests and analysis are all performed by nationally-certified laboratories.Therefore,the data obtained is reliable and can truly reflect the strata information and the physical and mechanical properties of the rocks and soil in Luhuatai.The data and conclusions contained in the dataset can be used as a reference for the study of the geological evolution of the Yinchuan Basin and for project construction and planning in Luhuatai.