本文選題：濕陷性黃土 + 靜止土壓力系數(shù)��； 參考：《工程科學(xué)與技術(shù)》2017年05期

【摘要】：目前得到的濕陷性黃土靜止土壓力系數(shù)K_0,無(wú)法反映應(yīng)力和含水兩個(gè)因素的影響。本文開展了原狀黃土增濕過程中K_0變化規(guī)律的試驗(yàn)研究,得到了力水耦合作用下K_0的計(jì)算方法。首先引入"增濕水平"這一概念描述土體的含水狀態(tài);開展豎向壓力作用下的側(cè)限分級(jí)浸水試驗(yàn),分別研究增濕水平、基質(zhì)吸力、豎向應(yīng)變與K_0的相關(guān)關(guān)系;開展黃土濕陷的離心模型試驗(yàn),驗(yàn)證室內(nèi)試驗(yàn)結(jié)論的有效性。試驗(yàn)結(jié)果表明:"增濕水平"物理意義明確,能夠反映土體的含水率初始情況和增濕過程;原狀黃土K_0隨著增濕水平的增大而線性增加,增加速率取決于豎向壓力的大小,豎向壓力越大增加速率越慢;增濕過程中K_0隨著吸力的減小而線性增加,豎向壓力越大K_0增加的速率越慢,與增濕水平對(duì)K_0的影響規(guī)律相似;不同豎向壓力下增濕過程中的豎向應(yīng)變與靜止土壓力系數(shù)K_0試驗(yàn)點(diǎn)分布在一個(gè)較窄的范圍內(nèi),可以采用同一雙曲線描述,且不同壓力作用與浸水作用的先后次序?qū)η�影響較小�；谏鲜鲂陆晾琰S土試驗(yàn)規(guī)律,建立以增濕水平和豎向壓力為自變量的K_0的表達(dá)式,以及以豎向應(yīng)變?yōu)樽宰兞康腒_0的表達(dá)式。
[Abstract]:The static earth pressure coefficient K _ 0 of collapsible loess can not reflect the influence of stress and water content. In this paper, the experimental study on the variation of K _ 0 during the humidification of undisturbed loess is carried out, and the calculation method of K _ 0 under the action of coupling force and water is obtained. Firstly, the concept of "humidification level" is introduced to describe the water state of soil, and the lateral limit step immersion test under vertical pressure is carried out to study the correlation between humidification level, matrix suction, vertical strain and K0, respectively. The centrifuge model test of loess collapsibility was carried out to verify the validity of the conclusion of laboratory test. The experimental results show that the physical meaning of "humidification level" is clear and can reflect the initial moisture content of soil and the humidification process, and the increase rate of the undisturbed loess K _ 0 increases linearly with the increase of the humidification level, and the increase rate depends on the vertical pressure. In the process of humidification, K _ 0 increases linearly with the decrease of suction, and the increase rate of K _ S _ 0 is slower with the increase of vertical pressure, which is similar to the effect of humidification level on K _ 0. The vertical strain and static earth pressure coefficient K _ 0 are distributed in a narrow range during humidification under different vertical pressures, which can be described by the same hyperbolic curve. The order of pressure and soaking has little effect on the curve. Based on the above experimental rule of loess in Yili, Xinjiang, the expressions of K _ s _ 0 with humidification level and vertical pressure as independent variables and K _ 0 with vertical strain as independent variables are established.
【作者單位】： 中國(guó)水利水電科學(xué)研究院;西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51379220;51279171;51679264)
【分類號(hào)】：TU444

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