Numerical Deep Foundation Piles Anchor Retaining Structure Deformation Simulation Analysis

Deep excavation is three-dimensional structure, in engineering design, most of the three-dimensional problem is reduced pit analyze planar problem. For general excavation plane, using the rationale is two-dimensional geotechnical engineering software for analysis more in line with reality. When analyzing the position of the corners of the pit, finite difference software FLAC3 D can create three-dimensional model of the excavation, the performance visual stress and strain distribution in the corners. The theoretical study of the excavation pit corner portion is not mature enough, the theory behind the practice is far, this paper, a deep excavation in Beijing, by horizontal displacement, vertical displacement monitoring provided by the monitoring data statistical analysis, the level of the male pit angular position, the cumulative value of the maximum vertical displacement is the most prone to security risks of the position, and therefore need to focus on the parts of the study. Through the use of simulation software to analyze the male FLAC3 D angular distortion at different step sequence to guide the excavation carried out under conditions similar to engineering practice activities. The main contents are as follows:(1) by numerical simulation of the maximum unbalanced force can be drawn in the pit balancing process before excavation and the excavation pit in different step sequence in the balancing process, the balance is due before excavation pit soil consolidation is deposited under its own weight stress, and when excavation pit unbalanced force tends to increase suddenly occurred after stabilized.(2) numerical simulation of excavation sites sun angle horizontal displacement analysis found that under the previous three-angle male pit excavation step sequence of horizontal displacement bias pit outside, this may be due to the male corner portion is subject to two directions bolt tension or cause upheaval in the bottom of the excavation started from the fourth step, the horizontal displacement of the deflection pit, and the displacement increases.(3) The numerical simulation of the excavation site of the sun angle vertical displacement analysis, found that the vertical displacement pit slope angle of the sun top upwards, and with increasing distance from the pit slope of vertical displacement decreases, It showed similar trends and monitoring data, which may be due to changes caused by the upheaval in the bottom.(4) through the vertical displacement at different distances from the sun angle positions pit horizontal displacement of slope analysis and distance analysis of different positions, horizontal and vertical displacement found pit corner portion of the position of the maximum deformation than others, which shows pit affected the corners effect, should pay attention to the size of the sun angle on both sides of the pit slope design size.