Experimental Study On Anchoring Force Transmission Of Rock Slope With Weak Layers Under Earthquake

In China,mountains and hills are widely distributed in China.In addition to frequent earthquakes,the stability of slopes under earthquake is very prominent,and the task of strengthening and controlling high and steep slopes is extremely heavy.Rock soil anchorage can not only mobilize the strength of rock and soil to improve its stress state,but also has low cost,easy construction and good performance.It is widely used in rock and soil support and plays a key role in engineering.At present,the research on anchorage mechanism under static action has become mature.However,the research on anchoring mechanism under dynamic action is just starting,and the related research is far behind the engineering practice.In view of this,this paper designs and completes the large-scale shaking table similar model test,through processing and analyzing the test data,studies the dynamic response of the anchored rock slope under the earthquake action,reveals the shear effect of the anchorage interface and the transmission law of the anchoring force,and carries out the main innovative research and achievement The results are as follows:1)The rock mass similar material suitable for pouring is developed,and the similar model of large-scale anchored rock slope is constructed by pouring method.The large-scale shaking table model test is completed.The acceleration and horizontal displacement of the anchored slope surface and slope body under earthquake action are successfully measured,and the strain of anchor rod body mortar interface and mortar rock interface is measured.2)The acceleration and displacement of slope surface and slope body are analyzed systematically,and the dynamic response law of slope with soft layer is revealed.It is found that the horizontal acceleration of the slope and the slope body have complex changes,and the variation law of the acceleration along the elevation presents obvious difference;the displacement of the slope surface increases rapidly,and the displacement of the measuring point at the lower part of the slope rapidly exceeds that of the upper part of the slope.3)Based on the analysis of the strain and shear stress on the two anchorage interfaces of rock slope,the distribution and evolution law of shear stress and strain along the length of the bar under earthquake action are studied.The transfer law of the force on the interface is revealed.The transfer order of the slope anchorage along the elevation isdiscussed.It is pointed out that the shear stress on the two anchorage interfaces is an inverted n-shaped distribution along the length of the bar The results show that the strain distribution along the rod length is "herringbone" with large middle and small two ends;slope anchorage is called from top to bottom;the stress and deformation of anchorage develop and transfer from weak layer to dangerous rock and bedrock on both sides.