本文選題：濕陷性黃土　切入點(diǎn)：增濕變形　出處：《中國(guó)水利水電科學(xué)研究院》2017年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：目前,黃土渠道地基濕陷性評(píng)價(jià)和處理方面仍采用"最大濕陷變形"的思想,與工程實(shí)際有一定的差距。本文基于"可能濕陷變形"的設(shè)計(jì)思想和方法,探討了濕陷性黃土地基的評(píng)價(jià)和處理方法,取得的成果摘要如下:(1)開(kāi)展了原狀黃土增濕變形特性的試驗(yàn)研究。首先引入了"增濕水平"這一變量來(lái)描述土體的濕度狀態(tài);其次以新疆伊犁黃土為對(duì)象,開(kāi)展了側(cè)限條件下的分級(jí)浸水試驗(yàn),測(cè)得了不同豎向壓力下各增濕水平Sw所對(duì)應(yīng)的增濕變形系數(shù)δup、基質(zhì)吸力s以及靜止土壓力系數(shù)K0,通過(guò)分析Sw-δuP、Sw-s、Sw-K0相關(guān)關(guān)系,建立了側(cè)限條件下增濕過(guò)程中的增濕變形本構(gòu)模型、土水特征曲線模型以及靜止土壓力系數(shù)表達(dá)式;然后以陜西張橋黃土為對(duì)象,通過(guò)三軸等應(yīng)力比條件下的分級(jí)浸水試驗(yàn),測(cè)得不同三軸應(yīng)力狀態(tài)下各增濕水平所對(duì)應(yīng)的增濕體應(yīng)變?chǔ)舦z、增濕剪應(yīng)變?chǔ)舝z,在對(duì)Sw-εvz、Sw-εrz相關(guān)關(guān)系進(jìn)行數(shù)學(xué)描述的基礎(chǔ)上,建立了三軸應(yīng)力條件下增濕過(guò)程中的增濕變形本構(gòu)模型;最后在伊犁某黃土渠道地基上,進(jìn)行了現(xiàn)場(chǎng)浸水試驗(yàn),測(cè)得了現(xiàn)場(chǎng)的變形場(chǎng)和濕度場(chǎng),揭示了該場(chǎng)地浸水過(guò)程的濕陷變形規(guī)律。(2)進(jìn)行了黃土地基增濕變形離心模型試驗(yàn)研究。對(duì)伊犁某渠道濕陷性黃土地基典型層原狀黃土開(kāi)展了飽和度為40%、60%與100%的3組離心模型試驗(yàn),在模型中設(shè)置分層變形觀測(cè)點(diǎn)和土壓力傳感器,模擬自重應(yīng)力下實(shí)際地基在增濕過(guò)程中的分層變形特性和土壓力變化規(guī)律;在黃土地基增濕變形離心模型試驗(yàn)的基礎(chǔ)上,以黃土地區(qū)修正系數(shù)β0為橋梁,提出了一個(gè)基于離心模型試驗(yàn)的黃土濕陷試驗(yàn)新方法,并與現(xiàn)場(chǎng)浸水試驗(yàn)成果相比較,較符合工程實(shí)際。(3)提出了黃土渠道地基濕陷性評(píng)價(jià)新方法。根據(jù)渠道工程特點(diǎn),采用非飽和土滲透理論和本文建立的黃土增濕變形本構(gòu)模型,提出了基于"可能濕陷變形"的黃土渠基濕陷性評(píng)價(jià)方法;參照《渠道防滲工程技術(shù)規(guī)范》(GB/T 50600-2010)和《渠道抗凍脹設(shè)計(jì)規(guī)范》(SL 23-2006),考慮到當(dāng)前渠道工程普遍采用板膜結(jié)構(gòu)的實(shí)際,以"可能濕陷變形"設(shè)計(jì)思想,提出了渠道地基濕陷等級(jí)劃分標(biāo)準(zhǔn)和渠道重要性類(lèi)別劃分標(biāo)準(zhǔn);采用"可能濕陷變形"的黃土渠道地基濕陷性評(píng)價(jià)新方法,以新疆伊犁一大型引水渠道工程為例進(jìn)行了渠基濕陷性評(píng)價(jià),結(jié)果表明本文提出的方法較為合理可行。
[Abstract]:At present, the idea of "maximum subsidence deformation" is still adopted in the evaluation and treatment of collapsibility of loess canal foundation, which is different from engineering practice. This paper is based on the design idea and method of "possible collapse deformation". The evaluation and treatment methods of collapsible loess foundation are discussed. The results are summarized as follows: (1) the experimental study on the humidification deformation characteristics of undisturbed loess is carried out. Firstly, the "humidification level" is introduced to describe the soil moisture state. Secondly, taking the Yili loess in Xinjiang as the object, the paper carried out the step immersion test under the condition of lateral limit. The humidification deformation coefficient 未 up, matrix suction s and static earth pressure coefficient K0 corresponding to different humidification levels under different vertical pressures were measured. By analyzing the correlation relationship between Sw- 未 UPU Sw-slSw-K0 and humidifying deformation, a humidification deformation constitutive model was established under the lateral limit condition. The soil-water characteristic curve model and the expression of the static earth pressure coefficient, and then taking Zhangqiao loess in Shaanxi as an example, the steeped soaking test under the condition of triaxial equal stress ratio is carried out. The humidifying body strain 蔚 VZ and the humidification shear strain 蔚 RZ under different triaxial stress state are measured. Based on the mathematical description of Sw- 蔚 VZN Sw- 蔚 rz correlation relationship, the constitutive model of humidification deformation under triaxial stress condition is established. Finally, the field soaking test was carried out on a loess canal foundation in Yili, and the deformation field and humidity field were measured. The centrifugal model test of wetting deformation of loess foundation was carried out. The saturation of the typical loess layer of collapsible loess foundation in Yili was 40% 60% and 100% respectively. Group centrifugal model test, The delamination deformation observation points and earth pressure sensors are set up in the model to simulate the delamination deformation characteristics and the soil pressure variation law of the actual foundation in the process of humidification under the self-gravity stress, and on the basis of the centrifuge model test of the loess foundation humidification deformation, A new method of loess collapsibility test based on centrifuge model test is put forward with the correction coefficient 尾 _ 0 in loess area as bridge, and the results are compared with the results of in-situ soaking test. A new method for evaluating the collapsibility of loess canal foundation is put forward. According to the characteristics of channel engineering, the unsaturated soil permeation theory and the constitutive model of loess humidification deformation established in this paper are adopted. The evaluation method of collapsibility of loess canal base based on "possible collapsing deformation" is put forward, with reference to the Technical Code for Canal seepage Control Engineering (GB / T50600-2010) and the Design Code for Canal Frost Resistance (SL23-2006C), considering the fact that the current channel engineering generally adopts slab-membrane structure, Based on the design idea of "possible collapsible deformation", this paper puts forward the criteria for classification of grade and importance of channel foundation, and adopts a new method of evaluation of collapsibility of loess canal foundation based on "possible collapse deformation". Taking a large diversion channel project in Yili, Xinjiang as an example, the collapsibility of canal foundation is evaluated. The results show that the method proposed in this paper is reasonable and feasible.
【學(xué)位授予單位】：中國(guó)水利水電科學(xué)研究院
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TV223

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