Deformation monitoring is of great significance in understanding the evolution process of landslides and evaluating their stability conditions. Distributed strain sensing (DSS) technology, with obvious advantages of long measuring distance and excellent long-term performance, has become a widely accepted method in landslide monitoring. Nonetheless, when monitoring the subsurface shear deformation of a landslide based on DSS technology, two significant challenges remain unresolved. First, the coupling behavior between the borehole-installed DSS cable and the surrounding soil is unclear. Second, how to convert the strains exerted on the DSS cable into shear displacements remains elusive. To address these issues, this study investigates the coupling deformation mechanism between the DSS cable and surrounding soil under both low and high confining pressures, and develops corresponding soil-cable coupling criteria. Subsequently, a novel strain–displacement conversion model, namely the accumulative integral method (AIM), is proposed based on the geometric configuration of the DSS cable during soil shearing. The proposed method is verified against laboratory shear test results and field monitoring data, yielding results that not only confirm the reliability of the soil-cable coupling criteria, but also demonstrate the superiority of the proposed AIM over other methods in terms of accuracy .

变形监测对于了解滑坡演化过程、评价滑坡稳定性状况具有重要意义。分布式应变传感（DSS）技术具有测量距离远、长期性能优异等明显优势，已成为滑坡监测中被广泛接受的方法。尽管如此，在基于 DSS 技术监测滑坡的地下剪切变形时，仍有两个重大挑战尚未解决。首先，钻孔安装的 DSS 电缆与周围土壤之间的耦合行为尚不清楚。其次，如何将施加在 DSS 电缆上的应变转换为剪切位移仍然难以捉摸。为了解决这些问题，本研究探讨了 DSS 索与周围土体在低围压和高围压下的耦合变形机制，并制定了相应的土索耦合准则。随后，基于 DSS 索在土壤剪切过程中的几何构型，提出了一种新的应变-位移转换模型，即累积积分法 (AIM)。所提出的方法针对实验室剪切试验结果和现场监测数据进行了验证，产生的结果不仅证实了土索耦合标准的可靠性，而且证明了所提出的 AIM 在准确性方面优于其他方法。是根据土壤剪切期间 DSS 电缆的几何配置提出的。所提出的方法针对实验室剪切试验结果和现场监测数据进行了验证，产生的结果不仅证实了土索耦合标准的可靠性，而且证明了所提出的 AIM 在准确性方面优于其他方法。是根据土壤剪切期间 DSS 电缆的几何配置提出的。所提出的方法针对实验室剪切试验结果和现场监测数据进行了验证，产生的结果不仅证实了土索耦合标准的可靠性，而且证明了所提出的 AIM 在准确性方面优于其他方法。