本文關(guān)鍵詞： 土質(zhì)邊坡 浸潤軟化深度 淺層穩(wěn)定性 破壞模式 對數(shù)螺旋線　出處：《鐵道學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：在雨水浸潤軟化引起邊坡淺層失穩(wěn)的"順坡平面"和"順坡折線"兩種破壞模式基礎(chǔ)上,明確邊坡淺層溜坍呈現(xiàn)組合式"順坡曲面"失穩(wěn)模式;基于Mohr-Coulomb強(qiáng)度理論,建立雨水浸潤軟化土體達(dá)到破壞的判別方程,導(dǎo)出順坡向滑動(dòng)的主滑區(qū)滑體產(chǎn)生剩余下滑力對應(yīng)的最小軟化深度zcr,論證軟化深度zw=zcr僅是產(chǎn)生淺層失穩(wěn)破壞的必要條件,充分條件還須考慮上下緣滑體的力學(xué)作用;確定對數(shù)螺旋線滑體上下緣滑動(dòng)面形態(tài),提出滿足上下緣滑體力矩平衡、中段主滑體靜力平衡的土質(zhì)邊坡淺層穩(wěn)定分析方法。分析表明:淺層邊坡失穩(wěn)的主滑區(qū)范圍L2隨zw呈雙曲線衰減關(guān)系,在L2=0對應(yīng)的最大浸潤軟化深度zf下,滑動(dòng)面退化為具有對數(shù)螺旋線型特征的單一整體滑面破壞模式。
[Abstract]:On the basis of two failure modes of "downhill plane" and "downhill break line" caused by Rain Water's infiltration and softening, it is clear that the combined "downhill surface" failure mode is presented in the shallow collapse of slope, and based on Mohr-Coulomb strength theory, A discriminant equation for the failure of Rain Water soak-softening soil is established, and the minimum softening depth zcrs corresponding to the residual sliding force in the main sliding zone along the slope is derived. It is proved that the softening depth zw=zcr is only a necessary condition for the shallow instability failure. The sufficient conditions must also consider the mechanical action of the upper and lower edge slip body, determine the shape of the upper and lower edge sliding surface of the logarithmic spiral slip body, and propose that the upper and lower edge slip body should meet the torque balance of the upper and lower edge slip body. The method of shallow stability analysis of soil slope with static equilibrium of main sliding body in middle section shows that the main slip zone L _ 2 of shallow slope shows hyperbolic attenuation relationship with zw, and under the maximum infiltration softening depth zf corresponding to L _ 2N _ 0, the main slip zone of shallow slope is of hyperbolic attenuation. The sliding surface degenerates into a single global sliding surface failure mode with logarithmic helical characteristics.
【作者單位】： 西南交通大學(xué)高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究開發(fā)計(jì)劃(973計(jì)劃)(2013CB036204)
【分類號】：U416.16

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