Performance of geogrid-reinforced soil retaining walls subjected#br#
to static and cyclic footing loadings
XIAO Chengzhi1，2，WANG Jiayong1，ZHOU Xia1
(1. School of Civil and Transportation Engineering，Hebei University of Technology，Tianjin 300401，China；2. Technology and Research Center of Civil Engineering，Hebei Province，Hebei University of Technology，Tianjin 300401，China)
Abstract：The model tests of geogrid-reinforced soil retaining walls(GRSRW) subjected to the static and cyclic footing loadings were carried out to investigate the mechanism and deformation characteristics of GRSRW considering the factors such as the location of footing，the magnitude of the load，the frequency of load and the numbers of loading cycles. The optimum of offset，0.3H(H，height of wall)，was determined based on the analysis of ultimate bearing capacity of the footing on the top of the retaining wall. The settlement of the footing and the lateral deformation of geogrid-reinforced soil walls increase with the increase of the magnitude of loading，the frequency and the number of loading cycles. When the static load applied on the footing is less than the ultimate bearing capacity，the ratio of the settlement to the wall height is less than 2% and the ratio of the horizontal deformation to the wall height is always less than 1%. When the cyclic loading is applied on the top surface of retaining walls，the settlement and the horizontal deformation increase remarkably compared with those under the same level of static loads. With the increase of cyclic loads and frequency，the settlement and the horizontal deformation increase quickly at the very beginning and then the increasing slows down as the number of cycles increase. The strains in geogrids for the uppermost layer which are generally greater than those in the other layers，increase significantly when the higher cyclic loads with larger cyclic numbers are applied. The failure mode of the retaining walls under the static loading and lower cyclic loads with low frequency is that the top panel blocks is squeezed out. The failure surface occurs at the verge of foundation and then develops deeper when the offset of the footing increases continually. The blocks in the middle of retaining wall tend to be squeezed out when the cyclic loads and the loading frequency increase.
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2017, Vol. 36 
