膨胀性粘土堤坝的填筑标准研究  

Placament Condition of expansive soils for embankment

作　　者：马时冬[1] 

机构地区：[1]华侨大学土木系

出　　处：《水利学报》1993年第4期33-40,共8页Journal of Hydraulic Engineering

摘　　要：膨胀土的填筑标准是一个有争议的问题。本文从一个车道路堤的实例出发,认为压实的膨胀土存在一个“稳定状态”,当土料的填筑含水量小于“稳定状态”的含水量时,会在一定的条件下逐渐吸水而趋近“稳定含水量”。该“稳定含水量”与土的性质有关,常在塑限附近,同时也与土体的受力状态有关。根据研究,作者建议,当确定膨胀土的填筑标准时,应先找出土料的“适用击实功能”,即其最优含水量与塑限相同时的击实功能。该功能下的最大干密度乘以压实度系数,即可作为设计干密度值。设计含水量可选在“稳定含水量”附近,它与塑限相近,差值一般不超过2％。A consensus of how to determine the placement condition of expansive soils for embankment fill is still lacking. In this paper, a proposal for determining placement condition based on the concept of 'stable state' is described. According to the experience gained from a road embankment, expansive soil would reach a 'stable state' after being compacted. If the placement water content is lower than the water content at 'stable state', compacted soils will gradually absorb moisture and approach its 'stable state'. The value of 'stable water content' is nearly equal to the plastic limit, Wp. and is also dependent on the load on the compacted soil. The 'stable water content' is recommended to be the design placement water content of expansive soils. A procedure for determinig required compaction density is also suggested in this paper.

关 键 词：土石坝 膨胀土 填筑标准 

分 类 号：TV641[水利工程—水利水电工程]