延边地区公路沿线边坡失稳试验分析

延边地区公路沿线分布着大量软岩，其岩性具有强膨胀性，致使这一地区公路边坡出现了多处滑坡现象。为了合理地处理这一工程地质问题，需要认真研究该种软岩的膨胀特性。选取滑坡体软岩为研究对象，定量分析了其自由膨胀率、无荷膨胀率和有荷膨胀率，并具体测定了其膨胀力，探讨了其膨胀率和膨胀力的变化规律，揭示了研究区软岩的膨胀特性，为公路建设中软岩边坡加固参数的选取提供了科学的依据。

Test analysis on instability of slope along highway in Yanji area

There are a lot of soft rocks with expansion characteristics along the highway in Yanji area which gives rise to instability of slopes in that area. So it is very important to study the expension characteristics soft rock. Some expansion parameters, such as free expansion rate, no-load expansion rate, loaded expansion rate, and expansion force were determined and analyzed in this paper, the regularities of expanding rate and force, and expansion characteristic of weakrock were also discussed, which can provide reasonable parameters of weak rock for slopes stability analysis in highway construction.