Engineering geological stratigraphy and physical properties of the loess in eastern Gansu
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摘要: 对很厚的黄土地层，合理地进行工程地质分层是场地工程地质评价的前提。为此，本文利用甘肃陇东黄土塬顶开挖的-100 m深人工水井，沿井壁及剖面露头对黄土-古土壤地层序列进行了详细编录，通过与标准剖面对比，确定了其磁性地层、岩性地层及时代地层单位。在井壁及剖面露头上按0.5 m间距采样，室内测定了其颗粒成分及基本物理性质指标，对这些指标随深度的变化规律进行了分析，将整个黄土地层划分为16个工程地质层。同一时代的黄土地层在同一沉积单元内的性质相对均一，因此整个黄土高原地区可参考该方案进行工程地质分层。Abstract: For the thick loess formation, a reasonable division of the loess strata in engineering geological aspects is the basic issue for site assessment of engineering geology. Therefore, a well of 100 m deep, which was dug in 1960’s for fetching water and now has been abandoned, are logged in detail along the well wall and along the outcrop below the well bottom. Referring the standard loess profiles, the paleomagenetic polarity, lithological stratum and geological period of the logged profile are determined. Samples were collected at a vertical interval of 0.5 m at the profile and used to measure the particle size and basic physical property indexes. Based on the logging, clay content and the physical properties, the whole loess profile is divided into 16 engineering geological strata. Because of the wind-blown origin, the loess properties of a stratum in a deposit environment is relative uniform, so the division strategy can provide a reference for the whole loess plateau.
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Key words:
- Eastern Gansu /
- loess /
- paleosol /
- physical property /
- engineering geological stratigraphy
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