膨胀土边坡的失稳机理及其加固

裂缝开展是膨胀土边坡失稳的主要因素。在裂缝开展区内的土体强度显著降低。由于天气的影响,随着土体干湿的交替变化,使裂缝深度随时间而不断发展,进入坡体裂缝中的雨水还会形成渗流。这些现象均引起边坡稳定性降低。裂缝的存在,可清楚地解释膨胀土滑坡表现出的浅层性、牵引性、平缓性、长期性、季节性、方向性。反过来说,这也表明膨胀土边坡易于失稳的机理是裂缝开展。从失稳机理出发,提出了采用土工膜覆盖避免裂缝开展的膨胀土边坡加固方法。两年现场试验及一年的工程实际应用,表明这种加固方法简便和有效。

Mechanism of slope slide of expansive soil and reinforcement for the slope

The fissure in expansive soil is the main factor of slope slide.The strength of expansive soil in fissured area reduces obviously.The alternafive changes of dryand rainy weather cause the increase of the depth of fissure.Rainwater flowing into fissure forms seepage.All these phenomena result in reduction of slope stability.The existence of fissure can be used to explain why the landslide of expansive soil exhibits the characteristics of shallow,gentle and drawing-shaped,and the slip happens seasonally,direc...