膨胀土边坡稳定分析方法研究

Bishop法等边坡稳定分析的经典方法用于分析膨胀土边坡时本身并无问题，只是由于计算条件的考虑不足，使得计算结果不能反映出膨胀土上的滑坡特点。在Bishop法的基础上，通过完善其计算条件，考虑了裂缝开展导致的土体强度降低、裂缝开展的深度、降雨时裂缝群中形成的渗流，以及可能的裂缝侧壁静水压力的作用等影响因素，完成了对膨胀土边坡稳定分析方法的改进。改进后的方法反映出裂缝对膨胀土边坡稳定性的影响，计算结果真实再现了浅层性、牵引性、长期性、平缓性和季节性等膨胀土边坡的滑坡特点。

Research on analytical method of stability of expansive soil slope

It is pointed out that the conventional method such as Bishop method is not incorrect itself for the stablity analysis of expansive soil slope, and only related conditions being short so as to cause the stability analysis cannot reflect the actual landslide characteristics. Based on the Bishop method, the factors are considered with introducing of the related conditions, which include the strength attenuation due to the cracking evolution, the depth of cracking, water pressure in cracks and the seepage force caused by rainfall. Thus the analytical method of slope stability in expansive soil areas is advanced so as to reflect the effect of cracking on the stability of expansive soil slope and the collapse features of expansive soil slope such as shallow layer, gradual traction, long-term, gentle and seasonal characteristics have been reproduced actually by the computed results.