摘要
为了评价不同夯击能、相同夯沉量控制条件下的黄土填方地基强夯处理效果,在晋中市某工程填方区开展了夯击能4 MN·m、6 MN·m、8 MN·m和10 MN·m共四种能级的强夯试验,测试强夯前后填土的干密度、压缩模量、湿陷系数、瑞雷波波速等物理力学性质指标.试验结果表明,夯击能6 MN·m、8 MN·m、10 MN·m分别在夯点处7 m、9 m、7 m深度内,夯间处8 m、7 m、6 m深度内,密实度提高、压缩性降低的效果与夯击能4 MN·m接近;夯击能4 MN·m、6 MN·m、8 MN·m、10 MN·m分别消除了5 m、4 m、7 m、5 m 深度内的湿陷性;与夯击能 4MN·m 试验相比,夯击能 6 MN·m、8 MN·m、10 MN·m总耗时分别缩减12.5%、37.4%、40.7%,油耗分别减少7.9%、26.9%、23.1%,表明高夯击能与低夯击能相比所用时间与设备耗油有大幅度降低.
Abstract
In order to evaluate the effects of dynamic compaction treatment on loess filled foundation under different compaction energies with same compaction settlement control conditions,four levels of dynamic compaction tests were carried out in Jinzhong City,including 4 MN·m,6 MN·m,8 MN·m,and 10 MN·m.The physical properties of the filled soil before and after dynamic compaction,such as dry density,compression modulus,coefficient of collaps-ibility,and Rayleigh wave velocity were tested.The test results show that the compaction energy of 6 MN·m,8 MN·m,and 10 MN·m is close to the compaction energy of 4 MN·m at depths of 7 m,9 m,and 7 m at the com-paction point,and at depths of 8 m,7 m,and 6 m between the compaction points.The compaction energy of 4 MN·m,6 MN·m,8 MN·m,and 10 MN·m eliminated the collapsibility of the foundation at depths of 5 m,4 m,7 m,and 5 m,respectively.Compared with the compaction energy test of 4 MN·m,the total time required for com-paction energy of 6 MN·m,8 MN·m,and 10 MN·m is reduced by 12.5%,37.4%,and 40.7%,the fuel con-sumption is reduced by 7.9%,26.9%,and 23.1%,respectively.The relevant test results can provide reference for the design and construction of dynamic compaction method for treating loess filled foundation.
维普
万方数据