摘要
针对某尾矿库加高扩容时坝基承载力不足,采用振冲碎石桩加固地基来提高坝基承载力。根据工程地质条件,确定桩长、桩径、布桩形式及桩间距;分两区布设振冲碎石桩,共297个桩;选取11根碎石桩桩体和12个桩间土检测点进行加固效果检测。结果表明:碎石桩桩体呈密实状态,施工质量满足要求;Ⅰ区桩间土处理后,呈中密状态,密实程度明显提高,锤击数平均值由8.0击提高至18.2击;Ⅱ区桩间土处理后,整体呈中密状态、局部呈稍密状态,密实程度明显提高,锤击数平均值由8.0击提高至15.6击,Ⅰ区、Ⅱ区地基土承载力特征值均满足设计要求。
In view of the insufficient bearing capacity of the dam foundation during the heightening and expansion of a tailings pond,vibro-replacement gravel pile was used to strengthen the foundation to improve the bearing capacity of the dam foundation.According to the engineering geological conditions,the pile length,pile diameter,pile layout and pile spacing were determined.Vibro-replacement gravel piles were arranged in two areas,with a total of 297 piles;11 pile bodies and 12 inter-pile soil detection points were selected to test the reinforcement effect.The results show that the gravel pile is dense and the construction quality meets the requirements.After treatment of soil between piles in zone I,it is in medium dense state,and the degree of compaction is obviously improved,and the average blow count is increased from 8.0 to 18.2.After the treatment of soil between piles in zone II,the overall state is medium dense and partial state is slightly dense,the degree of compaction is obviously improved,the average blow count is increased from 8.0 to 15.6,and the characteristic values of bearing capacity of foundation soil in zone I and zone II meet the design requirements.
作者
王立彬
刘硕
蒙萌
黄粤鑫
田文高
王明明
WANG Libin;LIU Shuo;MENG Meng;HUANG Yuexin;TIANWengao;WANG Mingming(Shenkan Qinhuangdao Engineering Design&Research General Institute Corporation MCC,Qinhuangdao 066004,China;Tongyuan International Engineering Design Research Co.Ltd.,Qinhuangdao 066004,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2020年第2期119-124,共6页
Journal of Anhui University of Technology（Natural Science）
关键词
尾矿坝
振冲碎石桩
坝基承载力
tailings dam
vibro-replacement gravel pile
bearing capacity of dam foundation
