Engineering geological characteristics of Late Quaternary sediments in the southern coastal area of Tianjin Binhai New Area
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摘要: 天津滨海新区位于渤海湾西岸泥质海岸带地区,中晚更新世以来历经海陆变化,形成了海相和陆相交替出现的地层。本文通过对30余眼钻孔岩心的沉积相分析和沉积物物理力学性质测试,讨论了天津滨海新区南部海岸带地区中晚更新世以来不同沉积相沉积物的物理力学性质,并对其工程地质特性进行了评价。结果显示,研究区中晚更新世以来沉积地层中,陆相地层致密硬塑,具有含水率低、孔隙比低、压缩性小、承载力高的特点;海相地层中粉土或粉砂层段也有孔隙比低、压缩性小的特点,但粘性土层段大多有含水率高、孔隙比高、压缩性大、承载力低的特点。Abstract: Tianjin Binhai New Area is located in the west muddy coastal area of Bohai Bay. It formed marine sedi-ment and terrigenous sediments alternating strata since the middle-late Pleistocene. Based on detail analysis of the sedimentology, chronology and physical and mechanical parameters in more than 30 boreholes, this paper dis-cussed the sediment physical and mechanical properties of different sedimentary facies since the middle-late Pleistocene in Southern coastal area of Tianjin Binhai New Area, and the engineering geological characteristics were evaluated. The results showed that since the middle-late Pleistocene in study area, continental strata is dense and hard plastic; moisture content is low; void ratio is low; compression is low; and the bearing capacity is high. The engineering geological characteristics of silt or silty sand section in marine strata is similar with continental strata, but cohesive soil section in marine strata; moisture content is high; void ratio is high; compression is high;and bearing capacity is low.
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Key words:
- Tianjin /
- Binhai New Area /
- coastal area /
- Late Quaternary /
- engineering geological characteristic
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