Measurement Results of Lateral Displacement of the Earth-Retaining Wall Using 3-Axis MEMS Inclinometer

Mitigating the impact on the surrounding environment is imperative during excavation of underground structures. Consequently, using measurement technology to monitor Earth-retaining wall displacement becomes paramount. This study validated the suitability of employing a 3-axis MEMS accelerometer-based inclinometer for quantifying horizontal displacement in retaining walls. The rationale behind this choice lies in its inherent lightweight nature and the minimal cable requirement of the inclinometer. Furthermore, data acquisition can be streamlined by daisy-chaining multiple inclinometers through a single cable and establishing interconnections via Wi-Fi, reducing the need for extensive on-site wiring. The displacement of a retaining wall was assessed during a practical excavation endeavor reaching a depth of 6.5 m to substantiate the measurement accuracy of the 3-axis MEMS inclinometer. Following continuous measurements for approximately one year, the efficacy of the 3-axis MEMS inclinometer for monitoring retaining wall displacement was confirmed.