A Calculation Method for Earthquake Earth Pressure Time History of Retaining Walls Based on the Principle of Energy Dissipation

Abstract

The present invention provides a time-history calculation method of seismic earth pressure of retaining wall based on the principle of energy dissipation: establishment of calculation model; calculation of seismic inertial force, gravity of sliding soil wedge, and support of wall to sliding soil wedge respectively Based on the principle of energy dissipation, the power and internal energy dissipation of the external force of the sliding soil wedge are calculated respectively; the balance equation is established based on the principle of energy conservation; The time history of the maximum value of the retaining force is the time history of the earthquake earth pressure; draw the earth pressure time history curve of the earthquake. The invention solves the problem that the traditional earthquake earth pressure calculation assumes the slip surface as an oblique straight line, simplifies the earthquake action to an inertial force with constant magnitude and direction, and does not consider the influence of earthquake waves on earth pressure when seismic waves propagate in the slope, and Most of the obtained seismic earth pressure is a fixed value and distorted, and a series of problems such as how the seismic earth pressure changes with time cannot be obtained.

Description

technical field [0001] The invention belongs to the technical field of seismic earth pressure analysis, in particular to a method for calculating time history of earthquake earth pressure on retaining walls based on the principle of energy dissipation. Background technique [0002] Gravity retaining wall has become the most commonly used form of retaining wall due to its simple form, easy local materials and convenient construction. Its characteristic is to maintain the retaining wall under the earth pressure by its own gravity However, the current seismic design of the structure is too simple, and there is no concrete and strong evidence for the safety and economy of the design, and there is a lack of evidence on how the earth pressure of the gravity retaining wall changes with time under the continuous action of earthquakes. Therefore, it is necessary to study the seismic earth pressure time history of gravity retaining walls. [0003] There are some methods for calculati...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a time-history calculation method of seismic earth pressure on retaining walls based on the principle of energy dissipation, which solves the problem that traditional earthquake earth pressure calculation assumes that the slip surface is an oblique line and the earthquake action Simplified to an inertial force with constant magnitude and direction, without considering the influence of seismic waves on the seismic earth pressure when propagating in the slope, and the obtained seismic earth pressure is mostly a fixed value, so it is impossible to draw how the seismic earth pressure varies with A series of problems such as time changes

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