【作者】 郭睿；

【导师】 樊怀仁；

【作者基本信息】 西安科技大学 ， 地质工程， 2003， 硕士

【摘要】 随着国家政策向中西部倾斜和西部公路交通事业的迅速发展，在关中地区修建大量各等级公路已成为必然。但由于黄土特殊的工程特性，常使修建在其上的公路路基沉陷、路基路面变形开裂、公路边坡塌陷等，严重影响了公路的正常运营和公路效益的发挥。为了提高公路建设质量，减轻或消除因黄土湿陷而造成的公路病害，以便指导关中地区公路的设计和施工，很有必要对黄土湿陷的特性和影响因素进行研究，准确评价黄土的湿陷等级，找出合适的防治对策。 本文首先分析了关中地区湿陷性黄土的组成成分，总结了湿陷性黄土的工程特性。重点以渭潼高速公路和咸阳机场专用高速公路沿线湿陷性黄土的试验资料为基础，对黄土湿陷影响因素进行了分析，通过回归分析建立了湿陷系数与各物理力学性质指标之间的关系式，并对关中地区黄土的湿陷机理进行了初步探讨。针对以往黄土湿陷等级评价的缺陷，综合考虑了影响湿陷性的主要因素，提出了一套行之有效的评价指标体系，运用二级模糊综合评判法对关中地区黄土湿陷等级进行了较为客观准确的评价。最后全面总结了湿陷性黄土处理的各种措施，针对关中地区湿陷性黄土的特点和实际情况，以咸阳机场高速公路路基处理为例，对多种地基处理方案进行研究论证后认为，强夯法和灰土挤密桩法适合该路段湿陷性黄土处理，并分别对这两种方案进行了设计，以期给工程实践提供建议值。更多还原

【Abstract】 With the incline of national policy to Midwest and rapid development of road transportation in the west, it has become inevitable to build lots of various-class roads. But due to special engineering properties of loess, which makes roadbed sink, roadbed and road-surface distort and craze, side slope of road subside and so on, these diseases affect seriously natural manage and benefit exert of road. It is essential to study collapsibility and influential factors of loess, evaluate correctly collapsible grade of loess, find out appropriate prevention and cure countermeasure in order to improve construction quality of road, alleviate or eliminate diseases of road results from collapsibility of loess, guide design and construction of road in Guanzhong area.Firstly this paper analyzes ingredients of collapsible loess at Guanzhong area, summarizes engineering properties of collapsible loess. Then on the basis of experimental data of collapsible loess of speedways from Weinan to Tongguan and Xianyang aerodrome, analyzing influential factors of collapsibility, establishing expressions between collapsible coefficient and physical mechanical character parameters via regression analysis, and discuss preliminarily collapsible mechanism of loess at Guanzhong area. Aiming at limitation of former grade evaluation on collapsibility of loess, considering synthetically main factors affect collapsibility, a set of effective parameters is put forward, the method of evaluating correctly collapsibility of loess at Guanzhong area is proposed using two-grade fuzzy synthesis evaluation. Finally summarizing comprehensively various measures deals with collapsible loess, aiming at property and actual condition of collapsible loess at Guanzhong area, taking example for foundation treatment of Xianyang aerodrome speedway, investigating and demonstrating many projects on foundation treatment and think dynamic compaction and lime-soil compaction pile are fit to treat collapsible loess of this section, designing both of theprojects and hope to offer suggestions to engineering practice.更多还原