絮凝加速吹填土沉积的试验研究

Experimental study on flocculation-accelerated deposition of dredger fill

水力吹填疏浚土后,上部泥浆需要一定时间沉积排水晾晒才能加固处理。通过室内试验,对比了疏水剂和高分子絮凝剂、排水条件、泥浆浓度和土体自重对沉积过程的影响,并进行了十万平方米的现场试验。研究表明,加入化学药剂后,泥浆前期沉降速度明显提高,泥水分离时间缩短;后期沉积速度变缓,沉积物强度低;配合一定排水条件可提高泥浆的后期沉积速度和沉积物强度;提高泥浆浓度和土体自重对沉积有一定的作用;利用絮凝技术的化学法加固施工具有可操作性。

After hydraulic reclamation of the dredger fill, the mud needs some time to deposit. The reinforcement treatment cannot be carried out until the sludge-water separation is completed and the separated water is drained. Through laboratory tests, the effects of chemical agents, drainage condition, slurry concentration and soil weight on the sludge deposition process are investigated. The field tests on one hundred thousand square meters are carried out. The results show that the early-stage deposition velocity of sludge increases obviously, and the sludge-water separation time is shortened after water hydrophobing agents and polymeric flocculants are added. However, the later-stage deposition velocity is slow and the deposition strength is low. Thus, certain drainage conditions are required to increase the later-stage deposition velocity and deposition strength of sludge. Improving the weight of soil and mud concentration has a certain effect on the deposition of the construction site. The chemical reinforcement method is feasible.