重力坝深层抗滑稳定试验中结构面变位测试技术

软弱结构面内部相对变位的测试一直是重力坝深层抗滑稳定试验中的一个重点和难点。以电阻应变技术为基础,成功研制了适用于地质力学模型中软弱结构面相对变位量测的位移传感器。该传感器体积小,精度高,同时设置有隔热装置,不受升温降强的影响,稳定性好。介绍了该位移传感器的设计思路、工作原理,并将该传感器应用于某重力坝三维地质力学模型综合法试验中,获得了主要结构面的内部相对变位,为大坝稳定性分析提供了科学依据。

Measurement technology of structural plane displacement in deep sliding stability test of gravity dam

The measurement of internal relative displacement of weak structural plane has been a key and difficult issue in the deep sliding stability test of gravity dam.Based on the resistance strain measuring technique,a displacement sensor is successfully de-veloped which is suitable for measuring the relative displacement of weak structural plane in geo-mechanical model test.With a small size and high precision,the sensor provides with thermal insulation,and is not affected by temperature increase and has good stability.In this paper,the design idea and the working principle of the displacement sensor are introduced firstly,and the sensor is applied to the three-dimensional geo-mechanic model comprehensive method test of a gravity dam.The internal relative displacement of main weak structural plane is obtained and it provides a scientific basis for the dam stability analysis.