基岩标的施工技术探讨与实践

基岩标是指在覆盖有松散地层的区域内为更准确测定地面沉降量，穿过覆盖层埋设在稳定基岩卜的标杆直通地面，经过保护处理作为相对稳定的基岩水准点。具有标孔要求高、基岩面判层准确、标杆安装要求高等特点。通过浙江省宁波市2座基岩标施工的实践，探讨了确保基岩标质量的关键技术和控制措施，对实际施工有一定的参考作用。

Discussion of Construction Technique of Bedrock Bench Mark and the Practice

Bedrock bench mark is a buried pole across the loose overburden layer to the stable bedrock for the accurate mo- nitoring of land subsidence, which is with the characteristics of high requirement on mark hole and mark pole construction and accurate bedrock surface deciding. Based on the practice of 2 bedrock bench mark construction in Ningbo, discussion was made on the key technologies and control measures to ensure the quality of bedrock bench mark.