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论述了膨胀土边坡现场吸力量测的方法和成果。研究认为，膨胀上边坡的基质吸力沿深度呈指数函数分布，且边坡中存在一个吸力“临界深度”，在此深度以上，基质吸力受土质、气候、温度等环境因素影响较大；在此深度以下至地下水位以上，吸力一般较小但并不为零。比较挖方和填方边坡的观测成果可知填方边坡的基质吸力比相同深度控方边坡的基质吸力大１～２倍，这主要是因为填方边坡密度、含水量均较低。根据实测吸力与含水量的关系，本文还绘制了现场土一水特征曲线。研究成果为非饱和土理论应用于实际工程探索了经验。
The methods and results of field strength measurement of expansive soil slopes are discussed. It is considered that the suction of the upper slope of the expansive slope is distributed exponentially along the depth, and there is a “critical depth” of suction in the slope. Above this depth, the matric suction is greatly influenced by environmental factors such as soil quality, climate, temperature, etc.; Below the depth to the groundwater level, the suction is generally small but not zero. Comparing the observation results of the excavation and fill slopes, it can be seen that the matric suction of the fill slope is 1 to 2 times larger than the matric suction of the control slope with the same depth, which is mainly due to the low density and moisture content of the fill slope. According to the relationship between the measured suction and water content, the paper also draws the on-site soil-water characteristic curve. The research results explore the experience of applying unsaturated soil theory to practical engineering.