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当均质黏性土坡采用回填压脚治理方案时,可采用简化的Bishop法进行计算。计算时,需对3类潜在滑动面进行验算:原边坡内、剪出口位于压脚区顶面以上的Ⅰ类滑动面;仅存在于回填压脚区内的Ⅱ类滑动面;贯穿原边坡与回填压脚区的Ⅲ类滑动面。当3类滑动面的稳定性系数相等且等于设计安全系数时,压脚效率最高。同时,通过对其他条件相同,抗剪强度参数(黏聚力c、内摩擦角φ)不同的多个边坡模型进行分析可知,均质土坡中c/tanφ值越大,加固效率最高的回填压脚截面的宽高比ω/h越大;相反地,c/tanφ值越小,效率最高的回填压脚截面的宽高比ω/h越小。最后,通过算例,阐明均质黏性土坡回填压脚方案的设计计算过程。
When homogeneous clayey soil slope adopts backfill presser foot control scheme, the simplified Bishop method can be used to calculate. Three types of potential sliding surfaces are to be checked during calculation: Class I sliding surfaces in the primary slope and shear outlets above the top of the presser foot zone; Type II sliding surfaces existing only in the backfill presser zone; Sloping and backfill nip area Ⅲ class sliding surface. The presser foot efficiency is highest when the stability coefficients of the three slip surfaces are equal and equal to the design safety factor. At the same time, the analysis of multiple slope models with the same conditions and different shear strength parameters (cohesion c, internal friction angle φ) shows that the larger the c / tanφ value is, the higher the reinforcement efficiency is On the contrary, the smaller the value of c / tanφ, the smaller the height-to-height ratio ω / h of the most efficient backfill foot cross-section is. Finally, an example is given to illustrate the design and calculation of the scheme of the backfill foot for homogeneous clay slope.