ENGINEERING GEOLOGICAL FEATURES AND TREATMENT EVALUATION OF SHICHENGPING LANDSLIDE ALONG GUILIN-LIUZHOU EXPRESSWAY

The paper systematically studies different effects of the former and later treatments of Shichengping landslide, which is the largest scale landslide along the first expressway in Guangxi, and its intention is to find out the causes leading to the failure of the former treatment and to form successful experience from the later treatment, making it a reference to other similar projects. It discusses the fundamental features of the landslide in geological, morphological, deformational and structural aspects, and analyzes and compares the former and later treatment designs. The result shows that Shichengping landslide is composed of an ancient and newly formed landslides, the formation of the new one caused by the ancient, and that the failure of the original treatment was due to the improper design because of the unawareness of the ancient landslide, more exactly speaking, mainly because of insufficient length of the anti-slide piles and the improper slope cutting. By making full use of the original anti-slide piles, comprehensive measures of slope cutting, water draining, piles stabilizing the later treatment connects the new piles and the new and old piles with horizontal reinforced concrete beams, which enhances the general stability of the slope and reduces the treatment cost by more than two-million yuan, and the result is satisfactory after four years of testing.