基于椭球体破坏假设的砂土中扩大头锚杆极限抗拔承载力计算方法OA

Based on the ellipsoidal failure hypothesis,a novel method for calculating the ultimate uplift capac-ity of underreamed anchors in sand was proposed,providing a theoretical basis for predicting their bearing ca-pacity.Firstly,by integrating the Mohr-Coulomb failure criterion and comprehensively considering soil param-eters,anchor geometric parameters,and inclination angle,the calculation formula for ultimate uplift capacity was derived.Secondly,the reliability of the method was validated using field test data from a hydrogen energy demonstration project in Yancheng and literature case studies.Finally,through case calculations and paramet-ric sensitivity analysis,the influence patterns of soil strength parameters(cohesion,internal friction angle),anchor dimensions,and installation inclination angle on the ultimate uplift capacity were investigated.The re-sults demonstrate that the soil cohesion and internal friction angle significantly affect the ultimate uplift capac-ity of underreamed anchors.The embedment depth ratio of the underreamed section should exceed 4.Verti-cally installed underreamed anchors achieve maximum uplift capacity,and inclination angles below 20° should be avoided for inclined installations.