【摘要】：三峽水庫消落帶在高壓淹水浸泡和干濕交替作用下,土壤力學(xué)特性必然發(fā)生變化,影響土體抗侵蝕性能,破壞庫岸穩(wěn)定性。目前對消落帶土壤力學(xué)特性變化及其對淹水—落干驅(qū)動的響應(yīng)尚不明確。以三峽水庫消落帶廣泛分布的紫色土為研究對象,模擬水壓作用和淹沒—出露交替過程,研究紫色土應(yīng)力—應(yīng)變和抗剪強度參數(shù)對高壓淹水和干濕交替作用的響應(yīng)。結(jié)果表明:水柱壓力、干濕交替次數(shù)和干濕交替幅度都能顯著驅(qū)動紫色土力學(xué)特性發(fā)生變化。與對照組相比,隨著水柱壓力增加,紫色土剛度逐漸增強,黏聚力降低幅度變小,內(nèi)摩擦角增大。隨干濕交替次數(shù)增加,紫色土剛度逐漸減小;內(nèi)摩擦角有所增大,黏聚力的變化趨勢與之相反,且隨干濕交替次數(shù)的增加而顯著降低。隨干濕交替幅度增加,抗剪強度迅速降低(相同圍壓下),黏聚力增大,內(nèi)摩擦角降低;與對照組相比,干濕交替幅度越小,土壤的內(nèi)摩擦角增大越多,黏聚力降低越多。
[Abstract]:Under the action of high pressure flooding and alternation of dry and wet, the soil mechanical properties of the three Gorges Reservoir will inevitably change, which will affect the erosion resistance of soil and destroy the stability of reservoir bank. At present, the response to the change of soil mechanical properties and its response to flooding-drying drive in the falling zone is not clear. Taking purple soil widely distributed in the collapse zone of the three Gorges Reservoir as the research object, the response of stress-strain and shear strength parameters of purple soil to the alternation of high pressure flooding and dry and wet water was studied by simulating the process of water pressure and the alternation of inundation and dew. The results show that the pressure of water column, the number of dry and wet alternation and the amplitude of dry and wet alternation can significantly drive the change of mechanical properties of purple soil. Compared with the control group, with the increase of water column pressure, the stiffness of purple soil increased gradually, the cohesion decreased, and the internal friction angle increased. With the increase of the number of dry and wet alternation, the stiffness of purple soil decreases gradually, the internal friction angle increases, the trend of cohesion is opposite, and decreases significantly with the increase of the number of dry and wet alternation. With the increase of dry and wet alternation amplitude, the shear strength decreases rapidly (under the same confining pressure), the cohesion increases and the internal friction angle decreases. Compared with the control group, the smaller the dry and wet alternation amplitude is, the more the internal friction angle of soil increases and the more the cohesion decreases.
【作者單位】： 中國科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所山地表生過程與生態(tài)調(diào)控重點實驗室;中國科學(xué)院大學(xué);四川大學(xué)建筑與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項目(41571278,41301290) 中國科學(xué)院科技服務(wù)網(wǎng)絡(luò)計劃項目(KFJ-SW-STS-175);中國科學(xué)院“西部之光”人才培養(yǎng)引進(jìn)計劃(2013&2016)
【分類號】：S157

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