文献类型：期刊文献

英文题名：Anchorage mechanism and parametric analysis of a novel interface-shear-stress-dispersing bolt

作者：Shu, Xiaoyun[1,3];Chen, Weizhong[1,2];Qiu, Xin[1,2];Zhu, Zhende[3];Tian, Hongming[1,2];Wu, Guojun[1,2];Tian, Yun[4]

机构：[1]Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Hohai Univ, Coll Civil & Transportat Engn, Nanjing 210024, Jiangsu, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China

年份：2024

卷号：154

外文期刊名：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:001334418700001)、、EI(收录号：20244117154393)、Scopus(收录号：2-s2.0-85205519636)、WOS

基金：The authors gratefully acknowledge the support of National Natural Science Foundation of China (Grant Nos. 42293353, 42293355, 52179116, 52179113 and 42207199), National Key R&D Program of China (Grant No. 2021YFC3100800), Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (Grant No. SKLGME-JBGS2401), Knowledge innovation program of Wuhan-basic research (Grant No.20220108010163), Postdoctoral Fellowship Program of CPSF (Grant No. GZC20240167).

语种：英文

外文关键词：Bolt; Soft rock; Anchorage mechanism; Tunnel

外文摘要：Squeezed large deformation of surrounding rock is frequently encountered in high geo-stress soft rock projects. Conventional bolt support often encounters the problems of insufficient anchorage force or anchors being pulled out, which seriously affects the safety of deep soft rock projects. In view of this, this study develops a novel interface-shear-stress-dispersing (ISSD) bolt with high strength and excellent deformability. The ISSD bolt is composed of the smooth rebar, rough rebar, and anchors, where the smooth rebar is further divided into several segments by anchors. The anchor consists of a hollow cylinder with a height of 0.10 m, whose inner diameter is equal to the diameter of smooth rebar (D1) while outer diameter (D2) matches the diameter of borehole (D3). Analysis of the anchorage mechanism of the ISSD bolt confirms that the anchors increase the distribution range of interface shear stress during the load transfer process. In addition, the free stretching of smooth rebar improves the ability of the ISSD bolt to resist the large deformation of surrounding rock, which makes it more suitable for weak surrounding rock with low anchorage interface strength. Optimization analysis of the anchor parameters (i. e., number, shape) reveals that increasing the number of anchors improves the anchorage force and pull-out displacement of the ISSD bolt. However, excessive anchors lead to the risk of progressive failure of anchorage interface, thus weakening the anchorage force of the ISSD bolt and its ability to resist deformation. The 4-m long ISSD bolt with two anchors performs best. An increase in the filling degree F (D1/D3) and end inclination angle alpha of the anchor not only improves the anchorage performance of the ISSD bolt, but also improves the stress uniformity of the grouting layer. The anchor with a F of 0.75 and a alpha of 45 degrees is the most suitable for the ISSD bolt.