Jiongchao Wang, Jun Zheng, Jichao Guo, Qing Lü, Jianhui Deng
{"title":"基于岩石拉伸应变软化模型的挠性倾覆岩体最大弯曲度评估方法","authors":"Jiongchao Wang, Jun Zheng, Jichao Guo, Qing Lü, Jianhui Deng","doi":"10.1007/s12583-022-1805-z","DOIUrl":null,"url":null,"abstract":"<p>Flexural toppling occurs when a series of layered rock masses bend towards their free face. It is important to evaluate the maximum bending degree and the requirement of supports of flexural toppling rock mass to prevent rock mass cracking and even failure leading to a landslide. Based on the rock tensile strain-softening model, this study proposes a method for calculating the maximum curvature (<i>C</i><sub>ppmax</sub>) of flexural toppling rock masses. By applying this method to calculate <i>C</i><sub>ppmax</sub> of 9 types of rock masses with different hardness and rock layer thickness, some conclusions are drawn: (1) the internal key factors affecting <i>C</i><sub>ppmax</sub> are <i>E</i><sup>⋆</sup> (<i>E</i><sup>⋆</sup>= <i>E</i><sub>ss</sub>/<i>E</i><sub>0</sub>, where <i>E</i><sub>0</sub> and <i>E</i><sub>ss</sub> are the mean deformation moduli of the rock before and after reaching its peak tensile strength, respectively), the strain <i>ε</i><sub>t</sub> corresponding to the tensile strength of rock, and the thickness (<i>h</i>) of rock layers; (2) hard rock layers are more likely to develop into block toppling than soft rock layers; and (3) thin rock layers are more likely to remain in flexural toppling state than thick rock layers. In addition, it is found that <i>C</i><sub>ppmax</sub> for flexural toppling rock masses composed of bedded rocks such as gneiss is related to the tensile direction.</p>","PeriodicalId":15607,"journal":{"name":"Journal of Earth Science","volume":"32 1","pages":""},"PeriodicalIF":4.1000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Method for Evaluating the Maximum Bending Degree of Flexural Toppling Rock Masses Based on the Rock Tensile Strain-Softening Model\",\"authors\":\"Jiongchao Wang, Jun Zheng, Jichao Guo, Qing Lü, Jianhui Deng\",\"doi\":\"10.1007/s12583-022-1805-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Flexural toppling occurs when a series of layered rock masses bend towards their free face. It is important to evaluate the maximum bending degree and the requirement of supports of flexural toppling rock mass to prevent rock mass cracking and even failure leading to a landslide. Based on the rock tensile strain-softening model, this study proposes a method for calculating the maximum curvature (<i>C</i><sub>ppmax</sub>) of flexural toppling rock masses. By applying this method to calculate <i>C</i><sub>ppmax</sub> of 9 types of rock masses with different hardness and rock layer thickness, some conclusions are drawn: (1) the internal key factors affecting <i>C</i><sub>ppmax</sub> are <i>E</i><sup>⋆</sup> (<i>E</i><sup>⋆</sup>= <i>E</i><sub>ss</sub>/<i>E</i><sub>0</sub>, where <i>E</i><sub>0</sub> and <i>E</i><sub>ss</sub> are the mean deformation moduli of the rock before and after reaching its peak tensile strength, respectively), the strain <i>ε</i><sub>t</sub> corresponding to the tensile strength of rock, and the thickness (<i>h</i>) of rock layers; (2) hard rock layers are more likely to develop into block toppling than soft rock layers; and (3) thin rock layers are more likely to remain in flexural toppling state than thick rock layers. In addition, it is found that <i>C</i><sub>ppmax</sub> for flexural toppling rock masses composed of bedded rocks such as gneiss is related to the tensile direction.</p>\",\"PeriodicalId\":15607,\"journal\":{\"name\":\"Journal of Earth Science\",\"volume\":\"32 1\",\"pages\":\"\"},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-08-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Earth Science\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s12583-022-1805-z\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Earth Science","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s12583-022-1805-z","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
A Method for Evaluating the Maximum Bending Degree of Flexural Toppling Rock Masses Based on the Rock Tensile Strain-Softening Model
Flexural toppling occurs when a series of layered rock masses bend towards their free face. It is important to evaluate the maximum bending degree and the requirement of supports of flexural toppling rock mass to prevent rock mass cracking and even failure leading to a landslide. Based on the rock tensile strain-softening model, this study proposes a method for calculating the maximum curvature (Cppmax) of flexural toppling rock masses. By applying this method to calculate Cppmax of 9 types of rock masses with different hardness and rock layer thickness, some conclusions are drawn: (1) the internal key factors affecting Cppmax are E⋆ (E⋆= Ess/E0, where E0 and Ess are the mean deformation moduli of the rock before and after reaching its peak tensile strength, respectively), the strain εt corresponding to the tensile strength of rock, and the thickness (h) of rock layers; (2) hard rock layers are more likely to develop into block toppling than soft rock layers; and (3) thin rock layers are more likely to remain in flexural toppling state than thick rock layers. In addition, it is found that Cppmax for flexural toppling rock masses composed of bedded rocks such as gneiss is related to the tensile direction.
期刊介绍:
Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences.
Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event.
The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.