Experimental Study On Bearing Behavior Of Anchor In Earth Fill

The soil anchor because of its flexible construction,short construction period,low cost and less pollution has been widely used in various kinds of geotechnical engiineering.However,because of the complexity of the rock and the limitations of the bolt detection,there is no unified theory on the design theory and mechanism of the current soil anchor.In this paper,cement soil anchors are used as research objects,shear tests,indoor drawing model tests,numerical simulations,etc.,to affect the contact characteristics of concrete and soil interface,soil water content and compaction degree Research and discussion were conducted to provide a reference for the design,construction and testing of the actual soil anchors.The main research work of this article includes the following aspects:Shear test of concrete-soil interface:Shear tests of silty clay and concrete at a site were carried out by a self-made anchor-soil interface shearer,and the water content and compaction of the soil sample were systematically analyzed.The influence of factors on the interface frictional resistance of concrete and soil under different normal stress conditions.The results show that under the same normal stress and moisture content conditions,the frictional resistance at the interface between concrete and soil is positively correlated with the compaction degree.With the increase of compaction degree,the frictional resistance also increases with the increase of the water content;there is an optimal moisture content.Range,within this range,the strength of the bolt-to-soil interface is the greatest under the same conditions.Indoor pull-out model test:under the condition of different water content and degree of compaction by bolt drawing test,it was found that bolting near the optimal moisture content is beneficial to improving the bearing capacity of the bolt;.Improving the degree of compaction can effectively improve the bearing capacity of the anchor rod,but when the compaction degree reaches a certain degree to extremely high degree continuing to achieve very high pressure has little effect on improving the bearing capacity of the bolt;the axial force distribution of the bolt along the length direction is not uniform,and is close to the axial force of the bolt at the outer end of the bolt is the largest and decreases along the direction of anchoring.The soil layer anchor has a certain effective length.Simply increasing the length of the bolt has little effect on improving the bearing capacity of the bolt;The relationship between axial force,water content,and compaction degree at different positions of the anchor bolts;the results of the theoretical model does not apply to the analysis of bearing capacity of all soil anchor bolts and has application limitations.Numerical simulation:The Molecule-Coulomb model was used to simulate the stress of bolts under different water content and compaction degree by FLAC3D numerieal simulation software.It was found that the results of the simulation were larger than those of the experimental model,and the trend of axial force and displacement curve was also studied.It's about the same,and it's more consistent with the test results.