Evaluation of soil slope reinforced by micro-piles based on acceleration response
WANG Fei1，WU Honggang2，3，4，GUO Chunxiang1，WU Zhixin1，3
(1. School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China；2. China Northwest Research Institute Co.，Ltd. of CREC，Lanzhou，Gansu 730000，China；3. China Railway Landslide Engineering Laboratory，China Northwest Research Institute Co. Ltd. of CREC，Lanzhou，Gansu 730000，China；4. Western Environmental Geotechnical and Site Rehabilitation Technology Engineering Laboratory，China Northwest Research Institute Co.，Ltd. of CREC，Lanzhou，Gansu 730000，China)
Abstract：In order to study the effect of micro-pile reinforcement in soil slope under the effect of earthquake action，the acceleration response data of inter-pile soil in soil slope with weak structural surface strengthened by micro-pile is obtained through large-scale shaking table test，and the experimental phenomena are analyzed in series. In the different seismic wave loading directions，analyze the different acceleration response of the pile group at different positions，the acceleration time-history curve is decomposed by the wavelet packet，the spectrum characteristics are analyzed，and compared with the general law of the slope acceleration response of soil slope without the weak structural plane，in this way，the micro-pile support effect is qualitatively evaluated. The results show that：(1) In the micro-pile reinforced slope，a variety of ways to release kinetic energy will be generated to ensure the stability of the entire slope. (2) The acceleration response of measurement point in the micro-pile reinforced slope tends to the general law of acceleration amplification obtained by the homogeneous material without the weak surface，while the unreinforced mountain side measurement point will produce the phenomenon of “acceleration staggered platform” under the sliding surface. Destructive characteristics of unsupported natural landslide bodies. (3) When horizontal loading，the low frequency is the dominant frequency that affects the acceleration response，while in the vertical direction，except for the mid-range response，the other frequency bands have obvious effects. (4) Around the slip zone of the river side of the rear row piles，the high-frequency filtering effect is obvious，while this effect of the mountain side of the rear piled is not obvious. The micro-pile reinforced slope has a significant effect on the overall structural improvement and the stability of the slope.
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2019, Vol. 38 
