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This article describes an advanced method for quantifying socket profiles and proposes empirical relations to estimate the maximum side resistance at the soft rock socket. At three boreholes in Busan, South Korea, socket profiles with a continuous 500-mm length were recorded by the Kyungsung Sonar Roughness Profiling System that was developed by the authors, and full-scale bidirectional pile-loading tests (BDPLTs) were performed to evaluate the mobilized side resistances for the soft rock sockets. Based on the reports of previous research, the concept of self-affine fractals was adopted to idealize the measured profiles, and the roughness ratio, which is a nondimensional factor, was proposed to quantitatively describe the asperity of the idealized profiles. From the results of the BDPLTs, the unit-side-load transfer curves, f-w curves, for the soft rock socket were plotted to determine the maximum unit-side resistances in accordance with the new mobilized displacement criterion predicated upon the reviews of 17 f-w curves for the soft rock socket obtained from BDPLTs conducted at other sites in South Korea. Furthermore, using these data, including the socket diameter, the unconfined compressive strength of the soft rock, and the roughness ratio, advanced empirical correlations considering socket roughness were studied and proposed in this article.