引江济淮试验工程河道边坡锚杆检测对比试验

依据GB50086—2015《岩土锚杆与喷射混凝土支护技术规范》和SL 377—2007《水利水电工程锚喷支护技术规范》对引江济淮试验工程膨胀土边坡、软岩边坡加固锚杆进行拉拔检测试验。结果表明,锚杆端部位移和检测方法相关,GB法检测的杆体端部位移大于SL法,位移转换系数为0.9~0.95;软岩边坡中锚杆的端部位移量小于弱膨胀土边坡;两种方法用于软岩及弱膨胀土边坡加固锚杆质量检测时,会产生弹性伸长值过大现象,采用杆端位移时间过程评价锚杆质量更具有合理性;SL法、GB法检测到的锚杆轴力线性相关,转换系数为0.9~1.05;采用SL法检测非预应力锚杆具有可行性,通过换算可得到GB法检测数据。

A comparative study on different testing methods for canal slope reinforcement bars in the water diversion experimental project from Yangtze to Huaihe River

Pull out test of the anchors in the water diversion experimental project from Yangtze to Huaihe River in both expansive soil slopes and soft rock slopes was carried out on the basis of Technical Code for Engineering of Ground Anchorages and Shotcrete Support(GB 50086-2015)and Technical Specification of Shotcrete and Rock Bolt for Water Resource and Hydropower Project(SL 377-2007). The results show that the displacement of the rod measured by the GB method is larger than that of the SL method, with a displacement conversion coefficient of 0. 9~0. 95. The displacement of the rod in soft rock slopes is less than that in weak expansive soil slopes. During the anchor rodstests in soft rocks and weak expansive soils, both GB and SL method overestimate the elastic extension values and it is more reasonable to evaluate the rod quality through the time process of the displacement. There is a linear relationship between the axial force measured by the two methods and the conversion coefficient is around 0. 9~1. 05. The SL method is a more efficient approach for non-prestressed anchors and the test data obtained by both methods can be converted mutually, which has positive significance and economic value for the evaluation of engineering quality and construction progress.