Support steel arch dynamic response evaluation method under blasting impact effect

• Main Authors: PEI QIUMING, ZHANG YUNHUI, LIAO XIN, CHANG XINGWANG, ZHENG JINMING, QIN LIMAO, XIAO YONG
• Format: Patent
• Language: Chinese; English
• Published: 30.10.2020
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; LARGE UNDERGROUND CHAMBERS; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; MINING; PHYSICS; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS; SHAFTS; TESTING; TUNNELS

The invention discloses a support steel arch dynamic response evaluation method under a blasting impact effect. The evaluation method comprises the following steps of 1, analyzing the stability of a steel arch support tunnel; and 2, calculating dynamic response parameters of a support steel arch. The maximum strain value of the steel arch is at the bottom of a stand column and is -102 mu epsilon,and the minimum strain value of the arch crown is -4 mu epsilon, so that the steel arch is mainly vibrated in the vertical direction under the action of dynamic load, and the maximum stress part is atthe bottom of the stand column. During dynamic load resistance design of the support steel arch, thickening of the bottoms of the stand columns can be considered, and the contact portions of the stand columns and surrounding rocks are reinforced; the acceleration of the inner surface of a tunnel of a measurement section is about 20m/s < 2 >, the tunnel and a supporting structure of the measurement section are mainly influ