边坡加固的压力分散型锚索的锚固机理与设计方法

项目名称： 边坡加固的压力分散型锚索的锚固机理与设计方法

项目编号： No.50874085

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 建筑科学

项目作者： 夏元友

作者单位： 武汉理工大学

项目金额： 38万元

中文摘要： 压力分散型预应力锚索相对于过去常用的拉力（分散）预应力锚索不仅受力合理，可以实现较大的承载力，而且经济合理使用范围更宽广。它于近年来广泛应用于水电、公路、铁路、矿山等边坡工程加固。但由于其受力机理的复杂性，目前其设计多采用工程类比法，缺乏完善可靠的设计计算方法。为此，本研究通过现场实测、模型试验、数值模拟与理论分析，系统地研究了压力分散型锚索锚固段的受力机理与加固边坡的锚固效应，分析与总结了压力分散型锚索的破坏形式及预应力施加过程中的锚固段受力变化规律及其在不同地层与预应力情况下的锚固段受力与传力机制，提出了压力分散型锚索锚固段界面剪应力分布曲线的两种分布新模式，即增高型和增高+平移复合型，并基于这两种分布模式，建立了压力分散型锚索锚固段的非均匀剪应力设计计算方法。研究还针对风化岩体力学特性，推导了压力分散型锚索锚固段受力的理论解；基于岩土工程多功能试验装置，提出了未知滑面边坡的破坏试验方法。研究成果对边坡（滑坡）工程灾害治理有重要理论意义与工程应用价值。

中文关键词： 边坡；预应力锚索；压力分散型；锚固机理；设计方法

英文摘要： The pressure-dispersive anchor cable can achieve a rather larger bearing capacity as compared to the pas usual tensioned (dipersive) anchor cable for it's reasonable stress behavior,and it has been widely used in recent years in reinforcing slope of hydroelectricity, road, railway, mining engineering for economic reason. However, for the complicated mechanism of this anchor cable, the engineering analogism is current use in design of this anchor cable, which is deficint in reliable method for design and calculation. To this end, by means of situ measurement, model experiment, numerical simulation and thearetical analysis, this research subject studied integrally the mechanism and slope reinforcement effect of the pressure-dispersive anchor cable. At the same time, this anchor cable's failure forms and stress change laws of anchor fixed length during applied process of prestress in different stratums were analyzed and generalized. Two distribution models of the interface shear stress in the anchor fixed length are proposed, one is increased type ,the other composed type by increased and pan. And then ,the design and calculation methods of non-uniform shear stress for pressure-dispersive anchor cables based on the above mentioned two distribution models were established. The theoretical solution of shear stress in the anchor fixed length about the pressure- dispersive anchor cable was obtained aim to the mechanical properties of weathered rock. An new method for slope destruction testing on the unknown sliding surface was proposed based on the multi-function test equipment. The research production had important thearetical significance and engineering application value for protection of slope (landslide) engineering.

英文关键词： slope; prestessed anchor cable; perssure-dispersive; anchoring and reinforcing mechanics; design method