Abstract
Frequent occurrence of landslides has seriously threatened the infrastructural projects in the Loess Plateau, China. At the beginning, with development of the landslide, several fissures were generated along the internal weak surface. Then, under the constant influence of rainfall and irrigation, the fissures were expanded and connected, which formed a consecutive sliding surface, consequently leading to the occurrence of the landslide. Therefore, the key to treat the landslide is to prevent the expansion and connection of fissures in the potential slip zone inside the slope. In this paper, an old landslide, which occurred at an early stage of the construction of the Lvliang Airport, was selected as a case study. A new type of grouting material was used to fill the fissures and reinforce the loess in the slip zone, so as to study the effect of material content on the slope stability. With current methods, loess specimens were taken from the slip zone inside the Lvliang Airport slope. Based on the GDS triaxial test system, a series of laboratory tests were performed on the undisturbed loess and the remolded which contained the stabilizer, including triaxial shear tests at constant matric suctions and wetting tests at constant deviator stresses. Moreover, the dichotomy in mathematics was chosen to find the threshold of the material content. The test results showed that the cohesion and the internal friction angle of the loess obviously increased after grouting. The failure behaviour of the loess along the wetting path was dependent on the material ratio and the stress level. Meanwhile, the critical state line of the slope, grouted with materials of different ratios, was compared by fitting the regression equation. It was found that the threshold value of the stabilizer content was between 15% and 20%, which was the most suitable ratio for improving slope stability with relatively lower cost.
Highlights
In order to meet the needs of economic development and population growth, a series of engineering projects have been carried out in the Loess Plateau, China [1]
Recent studies have shown that the key to treat the slope in Lvliang Airport is to inhibit fissures extension, as a result, this paper focused on the evaluation of slope stability after fissures’ filling
In order to simulate the wetting process of the slope filled with slurry of different ratios under the same stress state, the samples with the stabilizer ratio of 10% and 20%, respectively, were loaded under the same confining pressure and deviator stress for wetting test (WT1 and WT3)
Summary
In order to meet the needs of economic development and population growth, a series of engineering projects have been carried out in the Loess Plateau, China [1]. In view of the above findings, rainfall infiltration increases pore water pressure, reducing soil strength This failure mechanism will accelerate with the occurrence of fissures [36]. Erefore, the main point is whether there is an appropriate threshold of the stabilizer content, which can increase the cohesion and the internal friction angle of the loess just enough to resist the slope instability caused by the increase of pore water pressure. Ese tests aimed to simulate the wetting process of the slope caused by rainfall On this basis, the failure behaviour of samples along the wetting path before and after being stabilized was compared, and the reinforcement mechanism and feasibility of fissures’ filling were analyzed and evaluated
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