斜坡软弱地基填方工程特性及工程技术研究

Research on Engineering Characteristics and Engineering Techniques for Filling of Slope Weak Foundation

研究目的:斜坡软弱地基填方工程是西南山区铁路、公路、城镇建设中经常遇到的工程问题之一,是工程建设突出的薄弱环节,斜坡软弱地基填方工程特性及其工程技术需要研究。研究方法:作者及其课题组采用数值分析、离心模型试验、现场测试、综合分析等手段,系统研究了斜坡软弱地基填方工程特性及斜坡软弱地基填方工程技术。研究结果:基于变形控制理念,提出斜坡软弱地基填方稳定当量安全系数建议值和以限制斜坡软弱地基水平变形为核心的斜坡软弱地基填方工程设计原则意见。研究结论:基于变形控制的思想,在采用安全系数法对斜坡软弱地基的稳定性进行评价分析的基础上,应充分考虑斜坡软弱地基变形特性的因素,适当提高路堤稳定安全系数取值,以使斜坡软弱地基具有与水平软弱地基相当的稳定程度。在斜坡地基上填筑路堤,要查明地基土体的可压缩特性和基底横坡;为保证斜坡软弱地基路堤的稳定性,应采取限制斜坡地基水平变形的措施。

Research purposes： The filling of slope weak foundation is the common matter encountered in construction of railway, highway and city in mountain area, which is the weak link in the construction, so it is necessary to make research on the engineering characteristics and engineering techniques for filling of slope weak foundation. Research methods：The systematical research on the engineering characteristics and engineering techniques for filling of slope weak foundation is made by the means of numerical analysis, centrifugal model testing, field monitoring and synthetic analysis. Research results：Based on the concept of deformation control, the suggested limit of equivalent safety coefficient and suggestion to design principle are put forward respectively for stabilizing the filling of slope weak foundation and mainly for limiting lateral deformation of slope weak foundation. Research conclnsions：According to the concept of deformation control and on the basis of the evaluation and analysis of stability of slope weak foundation by adopting safety coefficient method, the factors of deformation features of slope weak foundation should be taken into consideration fully and the sampling safety coefficient for stabilizing embankment should be increased rationally in order to make slope weak foundation having the same stable level as that of lateral weak foundation. When filling embankment is conducted on slope weak foundation, the compressibility of soil of foundation and the bottom transverse slope should be inspected clearly and some measures should be taken for limiting the lateral deformation of slope weak foundation in order to guarantee the stability of slope weak foundation.