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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 岩土本构模型与参数研究 •

### 双强度折减法的量化分析

1. 1. 兰州理工大学 土木工程学院, 甘肃 兰州 730050;
2. 西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050
• 收稿日期:2016-01-05 修回日期:2016-08-01 出版日期:2016-08-25 发布日期:2016-09-19
• 通讯作者: 杨晓宇,E-mail:yxylzlg@163.com. E-mail:yxylzlg@163.com
• 作者简介:朱彦鹏(1960-),男,甘肃宁县人,教授,1982年在重庆大学获得硕士学位,现从事支挡结构、地基处理和工程事故处理与分析等方面的研究.E-mail:zhuyp1@163.com
• 基金资助:
教育部长江学者创新团队支持计划项目（2013IRT13068）；甘肃省科技重大专项计划项目（1302FKDA030）；国家自然科学基金项目（51508256）；甘肃省建设科技攻关项目（JK2015-5）；兰州市科技计划项目（2015-3-131）资助

### Quantitative analysis on double reduction method

ZHU Yanpeng1 2, YANG Xiaoyu1 2, YE Shuaihua1 2, MA Xiaorui1 2, LI Jingbang1 2

1. 1. College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou 730050, China
• Received:2016-01-05 Revised:2016-08-01 Online:2016-08-25 Published:2016-09-19

Abstract: Double reduction method (DRM) adopts reduction strategy which utilizes the different reduction coefficients of strength on the cohesion and internal friction angle and this view is more rational. However, the research on double reduction method still lacks of quantitative analysis or reasonable explanation. In the coordinate system of strength parameters, definition of FOS, path of reduction, and critical state are used to analyze the difference between traditional strength reduction method (SRM) and DRM. There is unity in path of reduction with these two methods; DRM can be regarded as the SRM where it begins at an initial virtual strength point to reduce. The gradual process of slope destruction is the attenuation of strength parameters. In this process, c and tan φ follow direct proportion function. At the same time, in the coordinate system of strength parameters, the concept of strength reserve can be reflected as the gradual process which is initial strength area approaches to critical strength area. Using these concepts can get the expression of the final FOS. Research of strength reduction method should concentrate on strength, and the reduction of strength parameters are just a way to achieve purpose of strength attenuation. Definition of FOS and regression analysis all indicate that critical state is inherent property of slope, given geometric model of slope, the critical state is constant, which is not related to initial strength parameters. The different critical points lead to the different results between DRM and SRM.

• TU43