本文選題：邊坡穩(wěn)定 + 剩余推力法��； 參考：《水利水電技術(shù)》2017年07期

【摘要】：降雨入滲過程中孔隙氣壓力變化是影響邊坡穩(wěn)定的重要因素,為了分析這種影響,提供一種考慮孔隙氣壓力影響的邊坡穩(wěn)定分析方法。首先基于水氣兩相流的理論與方法,計(jì)算降雨入滲下坡體的孔隙水壓力、孔隙氣壓力和飽和度的分布,并獲取降雨入滲過程中孔隙氣壓力引起的荷載變化量。而后,結(jié)合非飽和土抗剪強(qiáng)度理論及剩余推力法,將孔隙氣壓力引入到邊坡穩(wěn)定分析中,并以譚家河滑坡為例模擬分析考慮孔隙氣壓力對(duì)邊坡穩(wěn)定的影響。結(jié)果顯示,降雨導(dǎo)致坡體表層趨于飽和,在坡表與滑帶之間的孔隙氣壓變化較為敏感,而沿滑床向深層方向傳遞過程中孔隙氣壓發(fā)生衰減;坡體表層飽和區(qū)孔隙水壓力通過孔隙氣向坡腳傳遞,形成沿坡腳方向的孔隙氣壓力梯度,增大了滑體的下推力。結(jié)果表明,在相同的滲流條件下,考慮孔隙氣壓力的影響使同一滑動(dòng)面上的安全系數(shù)降低,對(duì)邊坡穩(wěn)定分析不利。該方法在坡體瀕臨失穩(wěn)時(shí)考慮孔隙氣壓力作用影響顯著,對(duì)反映某些具體工程滑坡現(xiàn)象更加符合實(shí)際。
[Abstract]:The variation of pore gas pressure in the process of rainfall infiltration is an important factor affecting slope stability. In order to analyze this effect, a slope stability analysis method considering the influence of pore gas pressure is provided. Based on the theory and method of two-phase flow of water and gas, the distribution of pore water pressure, pore gas pressure and saturation of slope body under rainfall infiltration is calculated, and the load variation caused by pore gas pressure during rainfall infiltration is obtained. Then, combined with the theory of unsaturated soil shear strength and residual thrust method, the pore gas pressure is introduced into the slope stability analysis, and the influence of pore gas pressure on slope stability is analyzed by taking Tanjiahe landslide as an example. The results show that the surface layer of the slope tends to saturation due to rainfall, and the pore pressure between the slope surface and the slip zone is sensitive to the change of pore pressure, and the pore pressure attenuates in the process of transferring along the slip bed to the deep layer. The pore water pressure in the saturated zone of the surface layer of the slope is transferred through the pore gas to the foot of the slope, and the pore gas pressure gradient along the slope foot is formed, which increases the downward thrust of the sliding body. The results show that under the same seepage condition, considering the influence of pore gas pressure, the safety factor on the same sliding surface is reduced, which is unfavorable to the slope stability analysis. The effect of pore gas pressure on slope is significant when the slope is on the verge of instability, and it is more practical to reflect the landslide phenomenon of some concrete projects.
【作者單位】： 三峽大學(xué)水利與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金(51279090);國家自然科學(xué)基金(51679129)
【分類號(hào)】：TV223
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本文編號(hào)：1847185