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淤泥类土一般是指在沉积环境中微生物作用下沉积形成的含较多有机质、疏松软弱的粘性土,其天然空隙比大于1,天然含水率大于液限,工程地质特性较差。总体来说,淤泥地质在我国沿江沿海等地带分布较为广泛。沿海沉积的淤泥类土,一般分布较稳定。厚度较大,土质疏松软弱;内陆和山区湖盆地及山前谷底沉积的淤泥类土,常零星分布,沉积厚度较小,性质变化大。淤泥地质具有突出的流塑性,其状态往往导致旋挖钻机在施工的时候非常容易出现缩颈、吸钻以及塌孔的现象,并且由于这些现象有时会互相影响从而导致综合工况更加复杂,因此淤泥地层几乎成了旋挖钻机施工领域中的一个难以逾越的“泥潭”。
Silt soil generally refers to sediment formed by the role of microorganisms in sedimentary environment containing more organic matter, weak loose clay, the natural void ratio greater than 1, the natural water cut is greater than the liquid limit, poor engineering geological characteristics. In general, silt geology is widely distributed in China’s coastal areas along the Yangtze River. Sediment deposited along the coast of the soil, the general distribution of more stable. Thicker and loose loess; silt soil deposited in inland and mountain lake basins and piedmont valleys often have sporadic distribution with small sedimentary thickness and large changes in nature. Silt geology has outstanding fluidity and plasticity, and its condition often results in necking, aspiration, and collapse of the rotary drilling rig during construction, and as these phenomena sometimes affect each other and result in more complicated overall conditions, Silt formation has almost become an insurmountable “quagmire” in the field of rotary drilling rig construction.