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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 880-888.doi: 10.7522/j.issn.1000-0240.2016.0099

• 岩土本构模型与参数研究 • 上一篇    下一篇

双强度折减法的量化分析

朱彦鹏1 2, 杨晓宇1 2, 叶帅华1 2, 马孝瑞1 2, 李京榜1 2   

  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

摘要: 双强度折减法(DRM)采用黏聚力和内摩擦角的非等比例的折减策略,更加符合真实情况,但对于该方法本身的研究仍然缺乏定量的分析与合理的阐述;通过安全系数的定义、折减路径以及临界状态这几个概念,在强度参数坐标系中,对双折减法和传统强度折减法(SRM)进行量化分析与对比,两种方法具有统一性,表现为DRM相当于从虚拟初始强度点开始折减的SRM.边坡失稳的渐进过程本质上为强度衰减的过程,其中c、tan φ遵循正比例函数关系;同时,强度储备的意义反映为初始强度面积S向临界强度面积S'逐步地逼近的过程,从而得到安全系数表达式;强度折减法的研究应围绕强度来进行,对于强度参数的折减只是强度弱化的实现形式,通过安全系数定义的分析以及算例结果数据的回归分析,表明临界状态是边坡的固有属性,一旦边坡的几何尺寸给定,它将是一个与初始强度参数无关的量.SRM和DRM的结果的异同分析对比,实际上是对临界点的分析.

关键词: 边坡稳定性, 强度折减法, 双强度折减法, 折减配套机制, 折减路径函数, 临界状态

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.

Key words: slope stability, strength reduction method, double reduction method, mechanism of matching reduction, function of reduction path, critical state

中图分类号: 

  • TU43