【摘要】 DDC地基处理技术作为一种传统的松软地基土处理方法,通过采用改进的夯扩自动化施工新设备和技术,解决了自身操作的问题,且扩大了夯扩直径,加大了夯实深度等。结合西北黄土地区某电厂现场施工原位测试过程和ABAQUS有限元软件,对全自动重锤新设备夯扩条件下DDC复合地基进行了相关研究。结果表明:1)设计桩位成孔为400 mm时,全自动重锤夯扩后孔位直径可达600～800 mm; 2)采用新设备进行地基夯扩处理时,存在一个最适宜夯扩次数,本文即为4次; 3)其土体夯扩加固区在水平方向范围可达5倍夯锤直径。可得结论:在全自动重锤夯实设备及技术条件下,夯扩处理后的土体成桩直径及土体处理深度均满足设计要求。更多还原

【Abstract】 The DDC method is a traditional way of foundation treatment for the soft foundation soil. By using the improved new technology and equipment of ramming and expanding automation,some self-operation problems are solved,the ramming diameter and compacting depth are increased and so on. Based on the field test of a power plant in the northwest loess area and the ABAQUS software,the related researches of DDC composite foundation under the new technology conditions are conducted,and the results show as follows: 1) When the designed diameter of the pile hole is 400 mm,and it can reach 600 ～ 800 mm after ramming; 2) There exists a most suitable ram number of times when ramming the foundation using new equipment,which is 4 times; 3) The reinforcement area can reach 5 times of the ramming diameter in the horizontal direction. The following can be concluded: under the conditions of full automatic hammer ramming equipment and technique,the soil mass pile diameter and the soil mass treatment depth all meet the design requirements.更多还原