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某电厂在孟县城西6km处,Ⅰ期工程2×1.2万kW发电机组于1991年元月发电;Ⅱ期扩建工程2.5万kW发电机组于1993年5月开始,现已建成。该场地在标高—4m至—8m处,普遍有4m厚的Ⅰ级(轻微)非自重湿陷性黄土;承载力标准值f_k=140kPa;不能满足该工程(二级建筑安全等级)的需要。Ⅰ期工程曾试用碎石挤密桩处理方案,采用DZ—60Y振动打桩机成孔工艺,经试桩因成孔困难而告吹。后改用(150kN×20m)强夯法处理成功。
A power plant was located 6km west of Mengxian County. Phase I 2 × 12MW power generation units produced electricity in January 1991; Phase Ⅱ expansion 25,000MW generating units started in May 1993 and has been completed. The site is generally 4m thick grade Ⅰ (slight) non-weight collapsible loess at elevation -4m to -8m; the standard bearing capacity f_k = 140kPa; it can not meet the needs of the project (secondary building safety grade). Phase I project has tried gravel compaction pile treatment program, the use of DZ-60Y vibration pile driver hole forming process, the test pile due to difficulties in forming a vent. After the switch to (150kN × 20m) Dynamic consolidation method successfully.