泥炭是一种混杂纤维状的土,它富含尚未完全分解的有机堆积物,是盆地或河滩衰亡后的遗迹,系沼泽类。它埋深于我市不同地区的浅层(10米以内)范围内,其物理力学特性大致为:孔隙比大于3、比重2.3～2.5、快剪的内摩擦角小于5°凝聚力小于0.03MPa,压缩模量Es(0.1～0.2)在0.1MPa左右。由于形成的历史不同和沼泽充填物的相异,在我市工程勘察中常见原生泥炭和次生泥炭二大类;原生和次生泥炭的主要鉴别应根据泥炭层底土层岩性所决定。原生泥炭的底层一般下卧不透水的黑褐色粘土(或粘粒含量较高的粉质粘土),次生泥炭底层一般下卧透水性较好的领土。在室内试验的指标中有一极明显的区分,原生泥炭的液性指数在1左右,次 Peat is a mixed fibrous soil that is rich in organic deposits that have not yet been fully decomposed and are the remains of a basin or riverbank after its demise. It is buried in different areas of the city shallow (10 meters) within the scope of its physical and mechanical properties are: porosity ratio of more than 3, the proportion of 2.3 to 2.5, the shear faster than the internal friction angle of less than 5 ° cohesion of less than 0.03MPa, The compressive modulus Es (0.1 to 0.2) is about 0.1 MPa. Due to the different historical formation and marsh filling, the two major categories of primary peat and secondary peat are common in engineering survey in our city. The primary identification of primary and secondary peat should be based on the lithology of the peat bottom soil. The bottom layer of the native peat is generally horizontal impermeable dark brown clay (or silty clay with high clay content), and the underlying peat bottom is generally horizontal with better water permeability. In the laboratory test indicators have a very clear distinction, native peat liquidity index of about 1, times