Model test study of bending moment and negative skin friction for batter rock-socketed piles under surface loadGuo Wei, Zhuang Daokun, Ren Yuxiao, Cui Wenxi, Yue Changxi and Yu ChangyiE3S Web Conf., 283 (2021) 01039DOI: https://doi.org/10.1051/e3sconf/202128301039