Abstract
The evaluation of seismic earth pressures is of vital importance for the earthquake resistant design of various retaining walls and infrastructures. It is one of the key research subjects in soil mechanics and geotechnical engineering. In engineering practices, the magnitude and distribution of seismic earth pressures are greatly affected by the mode and amount of wall displacement. However, classic Mononobe-Okabe solution can only compute the seismic earth pressures at the limit state and doesn’t consider the effect of the mode and amount of wall movement on the seismic earth pressure. In this paper, the formation mechanism of earth pressures against rigid retaining wall with RTT and RBT mode is revealed based on the previous studies and a new method is proposed to calculate the seismic earth pressures in such conditions. Corresponding formula are derived and computer code is written to calculate the seismic earth pressure distribution based on the proposed methodology. Variation of seismic earth pressure coefficient for the rigid retaining wall with RTT and RBT mode is calculated and discussed. In addition, the effectiveness of the method is confirmed by the experimental results.
Highlights
Earth retaining structures such as retaining walls, sheet pile bulkheads, cofferdams, bridge abutments and basement walls are widely used in civil engineering
According to the experimental results of Terzaghi and Tschebotarioff (1962), Sherif et al (1984), the earth pressure distribution against rigid retaining walls under RBT mode is nearly linear [17, 18], so the earth pressure distribution can be obtained by substituting the internal friction angle and wall friction angle by mob and mob respectively in Mononobe-Okabe solution, which can be expressed by the following equation: p(z) = KE (1 kv ) ( z + q0 ) + Krh z cos i cos2
It is found out that under rotation mode due to the variation of lateral strain constraint along the wall, the proportion of compression to stress-dilatancy effect varies at different depths of the backfill
Summary
Earth retaining structures such as retaining walls, sheet pile bulkheads, cofferdams, bridge abutments and basement walls are widely used in civil engineering. Pseudo-static analysis based on the Mononobe-Okabe solution is most widely used in engineering practices for earthquake resistant design due to its advantage of simplicity. It can only compute the seismic earth pressures at the limit state and doesn’t consider the effect of the mode and magnitude of wall movement on the seismic earth pressures. The movement mode of rotation about a point above the top of the wall (RTT) takes place in some retaining structures such as bridge abutments. While for some retaining structures whose bottoms are restrained such as the cantilever retaining wall, the movement mode of rotation about a point under the bottom
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
