The Influence Of Shape Coefficient Of Stone In Soil-rock Mixture On The Drawing Resistance Of Geogrid

Soil-rock-mixture is a kind of geological body composed of block stone as aggregate,and clay or sand as filler.The particle size distribution is not continuous,and there is a particle size fault between the large-size particles and the small-size particles.Soil-rock-mixture has been considered as a special geological body.Its mechanical properties are not simply the superposition of soil and rock.Soil-rock-mixture is widely distributed in China,There are a large number of unstable slopes with soil-rock-mixture around the Three Gorges Reservoir Bank in the Yangtze River Basin,The landslides along the Sichuan Tibet highway are mostly soil-rock-mixture landslides.Soil-rock-mixture is often regarded as the strengthening object of anchor rod,retaining wall and anti slide pile in the process of slope treatment,soil-rock-mixture also used as building materials in traffic,mining and water conservancy projectsIn this paper,a feasible method of classifying rock according to the shape coefficient is given.The drawing test of geogrid is carried out with the shape coefficient of stone as variable.In the aspect of numerical simulation,the shape of stone is reconstructed randomly and classified according to the shape coefficient.Four models are established with the classified stone,and the simulation of drawing test is carried out.Through the research,the following conclusions are drawn: With the increase of shape factor,the drawing resistance of geogrid decreases gradually;When the rock in the model changes from single layer to double layer,the drawing resistance of geogrid will also increase;The drawing resistance of Geogrid in clay is greater than that in sand.Based on this,an empirical formula for predicting the pull-out resistance of geogrid is obtained.There are two peaks in the drawing resistance curve of more than 2/3 drawing experiments,The analysis of the second peak shows that the soil-rock mixture filled with sand soil has more integrity than the soil-rock mixture filled with clay.The simulation results are consistent with the results of the experiment.: with the increase of shape coefficient,the peak resistance of geogrid decreases when it is pulled out.In the simulation,the average value of the X-euler of each rock is also recorded.The results show that with the increase of the shape coefficient,the rotation behavior of the rock decreases during the drawing,This result will help to explain the mechanism of the influence of the shape coefficient on the drawing resistance.