Study on the Range of Plastic Zone under the Stress Disturbance Method of Excavation Hole
In order to solve the problems of slow tilt-back and uneven settlement of inclined buildings under ordinary shal-low excavation method,the stress disturbance method of excavation hole is proposed.The correction coefficients are intro-duced into the stress solutions of elastic and plastic loops in rock mechanics to obtain the formula for calculating the plastic zone under the stress perturbation method of excavation holes.The stress disturbance test around the hole was carried out.The form of ground anchor back pressure is used to simulate the superstructure load.Helical disturbances to a depth of 50 mm were carried out around the excavation holes using long nails.By measuring the soil stress around the hole before and after the stress disturbance and combining with the finite element simulation results,the actual plastic zone range is ob-tained,and the correctness of the plastic zone formula is verified.The results are as follows.When the radius of the exca-vation hole is 100 mm and the stress disturbance range is one-half of diameter,the range of the plastic zone can be enlarged by 30%to 40%.The stress disturbance method of excavation hole has engineering application value for enlarging the plastic zone range and speeding up the building tilting correction speed.
shallow horizontal excavation tilting correctionstress disturbance method of excavation holestress around the holeradius of plastic zone
万方数据
维普
