文献类型：期刊文献

英文题名：A new method for assessing slope unloading zones based on unloading strain

作者：Bao, Han[1];Wu, Faquan[2];Xi, Pengcheng[3];Xu, Jianmin[4];Liang, Ning[3];Yan, Changgen[1];Xu, Wei[1];Qi, Qun[1]

机构：[1]Changan Univ, Sch Highway, Xian 710064, Peoples R China;[2]Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol, Coll Civil Engn, Shaoxing 312000, Peoples R China;[3]Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China;[4]Bei Fang Invest Design & Res CO LTD, Tianjin 300222, Peoples R China

年份：2020

卷号：79

期号：14

外文期刊名：ENVIRONMENTAL EARTH SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000545104000001)、、EI(收录号：20202808905235)、Scopus(收录号：2-s2.0-85087417233)、WOS

基金：This study was financially supported by the National Natural Science Foundation of China (Grant Nos. 41807246, 41927806 and 41790443), National Key R&D Program of China (Grant No. 2019YFC1520601), and Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province (Grant No. PCMGH-2016-Z-03). This study was also supported by the Fundamental Research Funds for the Central Universities, CHD (Grant Nos. 300102219217, 300102290201 and 300102219213). We gratefully thank the reviewers for their valuable time and constructive comments.

语种：英文

外文关键词：Slope unloading zone; Unloading strain; Crack statistics; Accumulative opening displacement; Unloading zone assessment

外文摘要：Unloading zones are formed in shallow slopes after rock mass relaxation and crack extension. Generally, slope unloading assessment depends on the traditional methods mainly related to the phenomena. However, unloading is a process of energy release. Based on the fracture mechanics and the statistical theory of rock mass structure, a theoretical analysis was performed to establish the relationship between the accumulative opening displacement of unloading cracks and unloading strain, and a new method was proposed to quantify the extent and damage degree of unloading zones according to unloading strain. The new method was applied to assess the slope unloading zones at a hydropower station dam site in Northwest China. Results showed that the accumulative opening displacement curve of unloading cracks regularly varied, and could be easily divided into three parts. The strong and weak unloading zones could be recognized from the slope of the first two parts, while their extent was limited by the two inflexions on each curve. By comparison with the traditional method, the new method confirmed the reasonability in the slope unloading zone assessment. However, with an increase in the unloading degree, the difference in the zonation results obtained from the two methods may increase.