Study On Similar Materials In Macroscopic Scale Of Dense-Suspended Structure Soil-Rock Mixtures

Soil-rock slope instability accounting for the majority of the total landslide disaster,which accounted for an average of 19%,while the southwest and western part of the region reached 64%,such slopes distributed along the highway,railway,tunnel engineering and mountainous villages.The research methods of slope instability are mainly based on theoretical analysis,numerical simulation and experiment test,but there are many technical bottlenecks about how to obtain data and laws.Model test is an important test method to reproduce the prototype phenomenon,whose first task is to conform to the similarity theory,and the development of similar materials is the key.This article only focuses on the following categories,the rock content of the key structural parameters in the soil-rock mixture is less than 30%,which is called dense-suspension structure.In this paper,the research on the similar materials of soil-rock mixture of dense-suspended structure is carried out.Based on the similarity theory of landslide model test,the similar material of soil-rock mixture of dense-suspended structure,which is suitable for macroscopic scale,is developed by the uniform test of mixture,and the similar material of granular phase as matrix,The influence of different rock content in the dense-suspended structure soil-rock mixture was discussed by using the predicted value obtained from the test point and the fine-grained similar materials.The main research conclusions are as follows:(1)Based on the statistics of 68 similar materials,the performance,frequency,characteristics and development use of 21 kinds of materials used in similar materials are summarized.The design of orthogonal test included seven factor and 5%,20%two level.Through the analysis of range and comparison choice,it is concluded that the matrix material increase 15%quality substitution,the density rubber powder(-0.127g/cm3),barite powder(0.038 g/cm3);the internal friction angle in Vaseline(-3.725°),quartz sand(0.677°);Rubber powder(6.862kPa),barite powder(-2.010 kPa)in cohesive Force,Vaseline(-2.40e-06cm/s)and barite powder(1.21E-06 cm/s)in the permeability coefficient.(2)Through the design of the mixture uniformity test,the fine grained similar material is developed as the matrix material,the dense-suspension structure of the soil-rock mixture is developed,and the matching regression equations,the density range(0.777?2.458g/cm3),the internal friction angle range(20.3?41.5°),the Cohesive Force range(4.73?61.43kPa)and the permeability coefficient range(2.27e-9?1.32e-2cm/s)are developed.and the three groups of compacted-suspended structure soil-rock mixtures are obtained.(3)The ratio of the test point of the proportion of the rock-containing soil-rock mixture is converted to the test point of no stone content.Then,the predicted values are obtained by the matching equations of fine grains and similar materials.The physical and mechanical characteristics of 10%and 30%in the dense-suspension structure are compared.With the increase of stone content,the density rises first and then suppresses,the internal friction angle increases linearly,and the cohesive force is discrete,the average performance is slightly increased and the permeability coefficient increases exponentially.