为克服传统的水管式沉降仪在深覆盖层坝基应用的局限性，经过比选与试验，开发研制了应用于深覆盖层的TSX型超大量程大坝坝基沉降仪，成功地解决了深覆盖层坝基的沉降监测。介绍了该仪器的结构、量程、精度、传感器类型、率定试验结果，仪器的应用范围、应用实例及应用效果。工程应用表明：研发仪器的测值符合大坝的变形规律，可长期、准确、连续、稳定地监测土石坝坝基沉降量。

 A wide-range TSX settlement gauge for dam foundation with deep overburden has been researched and manufactured to overcome the limitation of conventional water tube settlement gauge. The structure, measuring range, precision, sensor type and calibrated results of this settlement gauge are introduced. Its application field, practices and application effect are also given. It’s shown that the measurement by this gauge is consistent with the rules of dam deformation, and thereby could  be used to monitor dam foundation settlement in the long-term with continuous, precise and stable results.