<p>The horizontal deformation monitoring of rock and soil masses is of great significance in soft soil foundations, foundation pits, seawalls, and slope engineering fields. Although existing technology has been widely used in the horizontal displacement monitoring of rock and soil masses, no single technology can fully meet the long-term, distributed, automated, and low-cost requirements. Therefore, a novel piezoelectric inclinometer tube is proposed, which, for the first time, is combined with a sensor-enabled piezoelectric geocable (SPGC) as well as installed with a strain gauge (SG) and distributed strain-sensing optical cable (DSSOC). The results show that, compared with polyvinyl chloride (PVC) piezoelectric inclinometer tubes, acrylonitrile-butadiene-styrene (ABS) piezoelectric inclinometer tubes are more suitable for monitoring large deformations of rock and soil masses because of their high toughness and elastic modulus. In addition, the establishment of a normalized impedance change value–strain calibration formula for the piezoelectric clinometer tube revealed that there is a significant linear correlation between the normalized impedance change value and strain at different measuring points. Moreover, a theoretical formula for the normalized impedance change value and deflection of the cantilever beam was obtained by combining the beam bending theory and difference method. The experimental results show that the accuracy values of the strain and deflection are 10&#xa0;με and 1&#xa0;mm, respectively. This study provides a solid theoretical basis and practical guidance for the application of distributed piezoelectric sensors based on SPGCs in the horizontal displacement monitoring of rock and soil masses and thus has significant engineering application potential.</p>