| 太行山东麓北拒马河冲积扇结构探测及地震砂土液化判别 |
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| 关键词:saturated sand liquefaction risk of sand dynamic triaxial test standard penetration test anti-liquefaction shear stress method |
| 基金项目:中国地质调查局地质调查项目“通州—石家庄活动构造带区域地质调查”(编号: DD20190317);国家自然科学基金项目(编号: 41772275) |
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| Structural Exploration and Seismic Sand Liquefaction Assessment of North Juma River Alluvial Fan in the Eastern Piedmont of Taihang Mountains |
| The North Juma River alluvial fan and its adjacent areas are located at the eastern piedmont of Taihang Mountains. The surface of this area is covered by Holocene loose sand and silt, and the groundwater depth is relatively shallow. This area is susceptible to earthquake with a maximum magnitude of 6.5. Sand liquefaction may occur due to an earthquake. Field geological survey, engineering geological drilling, and high-density resistivity methods are used to explore the stratigraphic structure characteristics of North Juma River alluvial fan. Accordingly, the liquefaction risk of saturated sand and silt in the North Juma River alluvial fan is assessed using in-situ standard penetration test and indoor dynamic triaxial test. Based on the findings of research: (1) The alluvial fan of the North Juma River is composed of three groups of sedimentary cycles: The first group is Holocene fluvial sand, sand gravel, and gravel stratum distributed in the paleochannel of the southern branch of the North Juma River; The second group is the Late Pleistocene to Holocene alluvial-proluvial facies sedimentary stratum with a buried depth of about 15 m. The upper part of the alluvial-proluvial facies sedimentary stratum is comprised of sub-sand while the lower part is comprised of fine, silt sand; The third group is the late Pleistocene proluvial facies sedimentary stratum with a buried depth of more than 15 m. The upper part of the proluvial facies sedimentary stratum is comprised of silty loam, the middle part is comprised of sandy soil and fine silt, and the lower part is comprised of pebbles. (2) There is a liquefaction risk of saturated sand and silty sand in North Juma River alluvial fan. Based on the liquefaction evaluation results of the standard penetration method, the sand liquefaction level on the southern margin of the alluvial fan is slight, and the eastern margin of the alluvial fan near Zhuozhou City is medium. (3) The liquefaction risk of sand in the alluvial fan of North Juma River increases with an increase in earthquake magnitude and intensity. When the earthquake intensity of Ⅶ and Ⅷ occurs due to a near-field earthquake of M6.5, sand liquefaction will occur in the alluvial fan of North Juma River. |
| LIU Sha-sha,FENG Cheng-jun,TAN Cheng-xuan,DENG Ya-hong,QI Bang-shen,MENG Jing,ZHANG Peng,SONG Yan-xun,MU Huan-dong,ZHOU Yong-heng.2022.Structural Exploration and Seismic Sand Liquefaction Assessment of North Juma River Alluvial Fan in the Eastern Piedmont of Taihang Mountains[J].Acta Geoscientica Sinica,43(1):82-92. |
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