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基于顺坡渗流条件下土质边坡浅层顺坡平面滑动简化计算模型,以骨架防护单元为研究对象,分析骨架与土体相互作用关系以及低应力水平下土体抗剪强度非线性特点,提出矩形骨架框内土体沿骨架底部直接剪切滑动(模式Ⅰ)、被动土压力破坏(模式Ⅱ)两种模式及以竖向净距为表征参数的模式间转换阈值l_(sp),建立考虑渗透力影响的矩形骨架防护土质边坡浅层稳定安全系数表达式,初步构建了以边坡浅层稳定和矩形骨架结构强度为双控目标的防护工程检算方法。分析表明,阈值l_(sp)主要受骨架厚度h影响,并随h增加逐渐增大;受骨架竖向净距l_v影响的两种模式中,模式Ⅱ下的l_v对安全系数影响更为显著,模式判别不当将会因高估骨架抗滑作用而得出偏于危险的结果;在满足边坡浅层安全系数和骨架材料强度下截面深嵌的横窗型较截面平展的竖窗型骨架结构能更节省圬工用量。
Based on the simplified calculation model of slope sliding along the slope of shallow slope under seepage flow conditions, taking the skeleton protection unit as the research object, the interaction between skeleton and soil and the nonlinear characteristic of soil shear strength under low stress level are analyzed. Two modes of soil along the bottom of the rectangular framework with direct shearing and sliding (mode I) and passive earth pressure failure (mode Ⅱ) and the mode-switching threshold value l_ (sp) with vertical spacing as the characterization parameters are established Permeability stability of rectangular soil protection shallow slope stability of the safety factor of the expression, the preliminary construction of a shallow slope stability and the strength of the rectangular skeleton structure as a double-controlled target of the protection project detection method. The analysis shows that the threshold value l_ (sp) is mainly affected by the thickness h of the skeleton, and increases gradually with h; among the two modes affected by the vertical clearance l_v of the skeleton, the l_v under the mode II has a more significant impact on the safety factor, Inappropriate mode discrimination will be overestimated due to the skidding effect of the skeleton to draw a dangerous result; in the shallow slope to meet the safety factor and the strength of the skeleton cross-section embedded deep cross-section of the cross-section window-type skeleton structure Can save more labor usage.