双强度折减法的量化分析

发布时间：2019-06-04 19:07

【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、tanφ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.
[Abstract]:The double strength reduction method (DRM) adopts the unequal proportion reduction strategy of cohesion and internal friction angle, which is more in line with the real situation, but the research of this method itself is still lack of quantitative analysis and reasonable exposition. Through the definition of safety factor, reduction path and critical state, the double reduction method and the traditional strength reduction method (SRM) are quantitatively analyzed and compared in the strength parameter coordinate system. The two methods are unified. It is shown that DRM is equivalent to SRM. reduced from the virtual initial strength point The progressive process of slope instability is essentially the process of strength attenuation, in which c, tan 蠁 follows the positive proportional function relationship. At the same time, the meaning of strength reserve is reflected in the process that the initial strength area S approximates to the critical strength area S' step by step, and the expression of safety factor is obtained. The research of strength reduction method should be carried out around the strength. The reduction of strength parameters is only the realization form of strength weakening, through the analysis of the definition of safety factor and the regression analysis of the result data of the example. It is shown that the critical state is the inherent attribute of the slope, and once the geometric size of the slope is given, it will be a quantity independent of the initial strength parameters. The similarities and differences between the results of SRM and DRM are in fact the analysis of critical points.
【作者单位】：兰州理工大学土木工程学院;西部土木工程防灾减灾教育部工程研究中心;
【基金】：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
【分类号】：TU43

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