The upper and lower geogrid-soil interfaces are not symmetrical such that the disturbed area of lower interface is higher than that of upper interface.
拉拔过程中筋土上下界面并不对称，下界面扰动范围比上界面大；
The upper and lower geogrid-soil interfaces are not symmetrical such that the disturbed area of lower interface is higher than that of upper interface.
拉拔过程中筋土上下界面并不对称，下界面扰动范围比上界面大；
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