本文選題：塑性混凝土　切入點(diǎn)：真三軸試驗　出處：《華北水利水電大學(xué)》2017年碩士論文

【摘要】：塑性混凝土在實際防滲墻工程應(yīng)用中一般處于三維受力狀態(tài),且周圍應(yīng)力又隨水位的漲落等環(huán)境因素發(fā)生改變,但圍壓變化對塑性混凝土力學(xué)性能的影響規(guī)律還不清楚。本文針對這一問題通過48組塑性混凝土真三軸壓縮應(yīng)力-應(yīng)變?nèi)�試驗和18組卸圍壓應(yīng)力-應(yīng)變?nèi)�試驗,結(jié)合不同膨潤土摻量研究其力學(xué)性能和破壞形式;通過數(shù)值分析軟件來模擬塑性混凝土作為防滲材料在除險加固工程上的抗?jié)B效果和整體穩(wěn)定性能,主要內(nèi)容如下:(1)對圍壓恒定真三軸試驗數(shù)據(jù)用科學(xué)應(yīng)變計算方法進(jìn)行修正,修正后峰值強(qiáng)度降低,幅度在5%~10%;當(dāng)最小主應(yīng)力相同時,塑性混凝土的峰值強(qiáng)度隨中間主應(yīng)力的增大而增大,但增幅越來越小;峰值后曲線特征由近似塑化狀態(tài)變?yōu)榫哂忻黠@峰值點(diǎn)和明顯下降段;給出塑性混凝土真三軸受壓破壞公式:τ_0=-0.027+1.335σ_0-0.133σ_0~2(2)通過塑性混凝土卸側(cè)壓三軸壓縮試驗,研究了側(cè)壓條件一致的情況下,卸載同一側(cè)圍壓時,不同膨潤土摻量對塑性混凝土破壞類型的影響;在相同配合比情況下,卸載同一側(cè)圍壓時,不同圍壓條件對塑性混凝土破壞類型的影響;破壞形式主要有類似單軸試驗的脆性破壞和類似單軸試驗的延性破壞。(3)經(jīng)過數(shù)值分析表明,布設(shè)塑性混凝土防滲墻后浸潤線明顯降低,孔隙水壓力、水頭和水力坡降迅速減小,地基土層內(nèi)和土石結(jié)合部的滲流流速也明顯減小;水位降低時涵洞入口周圍的坡面和坡底處會出現(xiàn)較大變形,最大變形量為2mm左右,應(yīng)力云圖上對應(yīng)相同位置出現(xiàn)了拉應(yīng)力和應(yīng)力集中現(xiàn)象;防滲墻墻體內(nèi)以受壓應(yīng)力為主,并未出現(xiàn)應(yīng)力集中和不均勻沉降現(xiàn)象。
[Abstract]:The plastic concrete is generally in a three-dimensional stress state in the application of practical impervious wall engineering, and the surrounding stress changes with the fluctuation of water level and other environmental factors. However, the influence of confining pressure on the mechanical properties of plastic concrete is not clear. In this paper, 48 groups of true triaxial compression stress-strain full curve tests and 18 sets of unloading confining stress-strain complete curve tests are adopted to solve this problem. Combined with different bentonite content, the mechanical properties and failure forms of plastic concrete are studied, and the seepage resistance and overall stability of plastic concrete as anti-seepage material are simulated by numerical analysis software. The main contents are as follows: (1) the data of the true triaxial test of constant confining pressure are corrected by scientific strain calculation method. After the correction, the peak intensity decreases and the amplitude is 5 ~ 100.When the minimum principal stress is the same, The peak strength of plastic concrete increases with the increase of intermediate principal stress, but the increase is smaller and smaller. In this paper, the failure formula of plastic concrete under true triaxial compression is given: 蟿 0 + -0.027 蟽 -0.027 蟽 0-0.133 蟽 0 / 2). Through the triaxial compression test of plastic concrete under unloading lateral compression, it is studied that under the condition of the same lateral compression condition, when the same lateral pressure is unloaded, The influence of different content of bentonite on the failure type of plastic concrete and the influence of different confining pressure on the failure type of plastic concrete under the same mixing ratio and unloading the same lateral confining pressure; The main failure forms are brittle failure similar to uniaxial test and ductile failure similar to uniaxial test. The numerical analysis shows that the infiltration line of plastic concrete cutoff wall is obviously reduced, pore water pressure, head and hydraulic gradient are decreased rapidly. The velocity of seepage flow in the soil layer and the junction of soil and rock also decreases obviously, and when the water level decreases, the slope surface and the slope bottom around the entrance of culvert will be deformed, the maximum deformation is about 2mm. Tensile stress and stress concentration appear at the same position in the stress cloud map, and compressive stress is the main stress in the wall wall, but there is no stress concentration and uneven settlement in the wall.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV871;TV543.82

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