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變坡角淺層粘土斜坡穩定敏感性分析

Sensitivity of landslide stability in a shallow clay slope with multi-sloping angles

  • 摘要: 用地球物理方法確定了滑坡體的坡底滑移面,重建了斜坡體,并根據坡角的變化劃分了塊段,運用力的遞推原理,計算了滑坡體塊段的穩定性系數.對坡角、含水率、內摩擦角、內聚力、靜水壓力、地震力及列車荷載等因素進行了分析,討論了敏感性分析中因子變化步長、范圍及因子的相關性,獲得了粘性土層容重、內摩擦角、內聚力與含水率之間以及內摩擦角與內聚力之間的耦合關系方程.在因子獨立及關聯作用下,分別對斜坡穩定性進行了單因素分析并確定了敏感性因子.結果表明,內摩擦角、內聚力、坡角及含水率是影響斜坡穩定性的主要敏感性因素.將滑坡因子作為獨立變量和非耦合處理時,將弱化含水率及內聚力在穩定性分析中的影響.

     

    Abstract: An unsaturated clay slope, with multi-sloping angles, successively consists of loose layers of unsaturated clay, strongly weathered sandstone intermingled by mudstone, moderately weathered sandstone as well as lightly weathered sandstone. The slide interfaces were determined by geophysical approaches and the original slope was reconstructed. The sub-slope masses were classified based on the varieties of sloping angle. A force recursive principle was used to calculate the stability coefficient of the sub-slope masses. The influencing factors such as sloping, water content, cohesion, internal frictional angle, hydrostatic pressure, seismic force as well as train load were analyzed. The step length, range and correlation of the above-mentioned factors were discussed and coupling equations were established to reflect the relationships between density, cohesion, internal frictional angle and water content, as well as the relationship between internal frictional angle and cohesion. The sensitivity of the slope stability was analyzed and susceptive factors were determined when the above-mentioned factors were taken as independent and dependent respectively. The results show that internal frictional angle, cohesion, sloping and water content are the principal susceptive factors influencing the stability of the slope. It can fade the influencing extent of water content and cohesion to the slope stability if the above-mentioned factors are taken as independent variables without considering their correlation.

     

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