The Research On Collapsibility And Prevention And Cure Countermeasure Of Loess In Guanzhong Area

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.