新泰市田村水库坝基砂液化的判别与预防措施

饱和砂土的孔隙全部为水充填,在地震过程的短暂时间内,骤然上升的孔隙水压力来不及消散,砂层会完全丧失抗剪强度和承载能力,变成像液体一样的状态,即通常所说的砂土液化现象。文章从砂土液化机理与影响因素入手,依据工程勘察试验成果结合规范技术要求采用多种方法对田村水库的坝基砂液化进行判别。初判结果表明坝基砂可能液化。采用标准贯入锤击数法、相对密度法问题进行了复判,结果表明坝基砂存在液化的可能性,并提出了预防措施。

The pores of saturated sand are all filled with water.In the short time of earthquake process,the sudden rising pore water pressure is too late to dissipate,and the sand layer will completely lose its shear strength and bearing capacity and will thus become like a liquid,that is,the liquefaction of sand.Based on the mechanism and influencing factors of sand liquefaction,the liquefaction of dam foundation sand in Tiancun Reservoir is judged by various methods according to the results of investigation and test and the technical requirements of specifications.The initial results show that the dam foundation sand may be liquefied.Then,the standard penetration hammer number method and relative density method are used to judge the problems.The results show that there is the possibility of liquefaction of dam foundation sand,and the preventive measures are put forward.