注浆黏结锚杆荷载试验判稳方法的综合研究  

Integrated study on stability judgment method for grouting anchor tests

作　　者：付文光 杨立 冯栋栋 FU Wenguang;YANG Li;FENG Dongdong(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Shenzhen Geological Environment Research Institute Co.,Ltd.,Shenzhen 518063,China;Guangdong Engineering and Technology Research Center for Geotechnique and Underground Space,Shenzhen 518063,China;Fu Wenguang’s Innovation Studio,Shenzhen 518063,China;Shenzhen Building Safety and Engineering Quality Testing and Appraisal Center,Shenzhen 518052,China;Shenzhen GongKan Geotechnical Group Co.,LTD,Shenzhen 518063,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]深圳市地质环境研究院有限公司,广东深圳518063 [3]广东省岩土与地下空间工程技术研究中心,广东深圳518063 [4]付文光创新工作室,广东深圳518063 [5]深圳市房屋安全和工程质量检测鉴定中心,广东深圳518052 [6]深圳市工勘岩土集团有限公司,广东深圳518063

出　　处：《岩土工程学报》2024年第4期694-704,共11页Chinese Journal of Geotechnical Engineering

摘　　要：对注浆黏结锚杆各种荷载试验的位移稳定判定方法研究表明:(1)锚固体与地层界面蠕变遵循蠕变机理,判断锚头位移稳定本质上就是判定界面蠕变是否稳定;(2)荷载较小时界面发生稳定蠕变,超过临界荷载后发生蠕变破坏,完整破坏过程可分为初始、持续及加速3个阶段,判稳不能采用初始阶段数据、应主要依据持续阶段的蠕变特性;(3)蠕变破坏形式约2/3锚杆为突变型,1/3为缓变型,对应着3类蠕变曲线形态;(4)用于判稳的位移阈值不应小于0.1 mm,单元时长不应短于10min,位移增量不能直接用于判稳;(5)判稳应定性判断蠕变速率总体上在减速,应确定定量指标使速率维持在较低水平从而使位移收敛;(6)主要应依据具有位移与时间双重属性的参数判稳,单元时长位移增量的判稳准确度较高,而蠕变率2.0 mm任何情况下都适用;(7)以蠕变率2.0 mm为内在原则的推荐判稳方法,适用于各种应用场合及各种类型的注浆黏结锚杆,适用于各种荷载试验及快速法等试验加卸载方法。The researches on the judgment methods for displacement stability of grouting bonded anchors with various loading tests in cohesive soil layer show that:(1)The interface creep between anchor grout and strata follows the creep mechanism,and the determination of displacement stability of anchor head is to determine whether the interface creep is stable essentially.(2)Stable creep occurs at the interface when the load is relatively small,and creep failure occurs when the load exceeds the critical one.The complete failure process can be divided into three stages:initial,sustained and accelerated.The stability should be determined according to the creep characteristics of the sustained stage rather than the data of the initial stage.(3)About two-thirds of the anchor creep failure forms are abrupt,and the rest are slow,which corresponds to three kinds of creep curve forms.(4)The displacement threshold for stability judgment should not be less than 0.1 mm,the unit period should not be shorter than 10 min,and the displacement increment cannot be directly used for stability judgment.(5)In stability judgment,it should be determined qualitatively that the creep rate is slowing down on the whole,and quantitative indicators should be determined to keep the rate at a low level so as to make the displacement convergent.(6)The stability judgment should mainly be based on the parameters with dual attributes of displacement and time.Its accuracy of the creep variable in the unit period is relatively high,and the creep rate of 2.0 mm is applicable in any case.(7)The creep rate of 2.0 mm as the internal principle of the recommended stability judgment method is suitable for all kinds of applications and various types of bonded anchors,all kinds of loading tests and all kinds of loading and unloading methods such as rapid method.

关 键 词：判稳 蠕变率 位移增量 位移阈值 稳定蠕变 蠕变破坏 蠕变机理 快速法 

分 类 号：TU470[建筑科学—结构工程]