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中国西部柴达木盆地察尔汉盐湖区,分布着易溶盐含量极高的软弱超盐渍土。其工程特征属饱和、流塑、中至高压缩性的粘质粉土和粉质粘土。天然状态下土的容许承载力仅为60—80千帕。粘质粉土在七度地震条件下具有液化可能性。为改善盐渍土地基的工程性能,采用了振动水冲碎石桩加固地基的方法。由于盐渍土的力学特征与土中易溶盐含量及成份有密切关系,所以在振动水冲碎石桩制桩过程中,为保持盐渍土中易溶盐原化学成分和含量不致改变,采用了与土中易溶盐成分相当的盐溶液(卤水)作为制桩所需的冲洗液,从而避免了桩间土的力学强度不致因盐份消失而降低。通过对加固前后地基性能一系列检测数据的对比,证明了软弱超盐渍土地基采用振动水冲碎石桩加固,获得了良好的技术效果。地基承载力提高了1—2倍,土的液化性得到了消除。
In the Chaerhan Salt Lake area of the Qaidam Basin in western China, weak super-saline soils with very high soluble salt content are distributed. Its engineering features are saturated, flow-molded, medium to high compressible clay and silty clay. The allowable bearing capacity of the soil under natural conditions is only 60-80 kPa. Muddy silt has a liquefaction potential under a 7 degree earthquake. In order to improve the engineering performance of the saline soil foundation, the method of vibrating water to break the stone pile to reinforce the foundation was adopted. Since the mechanical characteristics of saline soil are closely related to the content and composition of readily soluble salts in soil, the chemical composition and content of readily soluble salt in saline soil will not change during the process of vibratory water-accurate stone piles. The salt solution (brine) equivalent to the easily soluble salt in the soil is used as the rinsing solution needed for the pile making, so that the mechanical strength of the soil between the piles is not reduced due to the disappearance of salt. Through comparison of a series of test data of the foundation before and after reinforcement, it is proved that the soft and supersalted soil foundation is reinforced with vibrating water and stone piles, and a good technical effect is obtained. The bearing capacity of the foundation increased by 1 to 2 times, and the liquefaction of the soil was eliminated.