摘要
为了适应工程建设的需要,建设部于2012年4月5日正式发布了《建筑基坑支护技术规程》(JGJ 120-2012)。通过典型工程实例,采用埋设振弦式钢筋测力计的方法,并且分别依据新、旧规程计算土钉轴向拉力标准值。将此值与某一典型基坑土钉支护工程土钉拉力实测值进行对比。经过分析得出新规程(JGJ 120-2012)土钉轴向拉力的计算方法较旧规范(JGJ 120-99)计算所得土钉轴向拉力标准值接近滑楔体,使土钉支护设计更加合理;规范计算所得的土钉轴向拉力标准值远大于土钉轴向拉力实测值,安全储备较大;经验系数ηb合理的选取,也是土钉支护合理设计的重要因素。
In order to meet the needs of project construction,the Ministry of Construction in April 5,2012 formally issued 'Technical specification for retaining and protection of building foundation excavations'( JGJ 120-2012). Taking a typical project as example,the tensile force is monitored by embedded vibrating wire reinforced dynamometer,and calculated according to both the new and the old standard. Comparing the values,it is found that the axial tensile force of soil nail calculated according to the new specification( JGJ 120-2012) is more suitable to the wedge nailing model than that according to the old specification( JGJ 120-99). The present soil nailing design method is more reasonable. The calculated nail axial tension force is far greater than the measured which means the safety factor is large.Reasonable selection of experience coefficient ηbis an important factor for the soil nailing design.
出处
《工程勘察》
2015年第5期30-33 91,91,共5页
Geotechnical Investigation & Surveying
关键词
土钉支护
土钉轴向拉力
新旧规范
现场测试
soil nailing
soil nail axial tensile force
new and old standards
in-situ test
