大面积回填深厚粘土强夯试夯分析

为掌握深厚粘土强夯施工参数是否合理、可行,依据不同的回填深度,选用不同强夯试夯参数,对试夯后回填土性状进行了测试和分析。工程场地由一定膨胀性的粉质粘土和粘土回填形成,最大深度达8 m以上,设计采用强夯法处理。从试夯结果分析可知,处理6~8 m回填深度区域,夯击能3 000 kN·m、间距6 m的夯击参数在处理效果上优于夯击能2 000 kN·m、间距5 m的夯击参数。深厚回填粘土的强夯处理参数选取上优先考虑处理深度,通过调整夯点间距、夯击点数达到施工各项参数的最优组合。实践证明,开展试夯工作在强夯设计与施工过程中尤为重要。

Analysis of Dynamic Compaction Test for Depth Clay Backfills

The project site had been backfilled by silt clay and clay which had the characteristics of expansive soil. The maximum depth of backfills was more than 8 m,dynamic compaction was designed to treat backfills. In order to grasp the parameters of dynamic compaction for deep backfills are reasonable and feasible,we chose different parameters of dynamic compaction test with different depths,tested and analyzed backfill properties after compaction test. The results of test showed that compaction parameters of 3 000 kN·m and 6 m in the treatment effect was superior to parameters of 2 000 kN·m and 5 m for 6 ~ 8 m depth backfills,adjust the distance and compaction count to the construction of optimal parameter and treatment effect. Proved by practice,carry out compaction test work in dynamic consolidation design and construction process is particularly important. As far as parameters selection be concerned,we firstly consider from the depth of processing,and adjust the spacing,blow count of tamping points to the optimal parameter of construction and treatment effect. It is particularly important to carry out dynamic compaction test in process of design and construction process.