本文選題：真空堆載聯(lián)合預(yù)壓 + 離心機(jī)試驗(yàn)��； 參考：《河北工業(yè)大學(xué)》2015年碩士論文

【摘要】：本文依托邢衡高速現(xiàn)場工程和離心機(jī)試驗(yàn)對真空堆載聯(lián)合預(yù)壓加固軟土路基進(jìn)行了深入分析。沉降結(jié)果表明,離心機(jī)沉降先快然后迅速減慢,而現(xiàn)場工程沉降速率則是逐漸減慢。從孔隙水壓力和土的有效應(yīng)力結(jié)果來看,隨著深度的增大,孔壓的值越大,而有效應(yīng)力值在減小,現(xiàn)場工程的孔壓消散值要大于離心機(jī)試驗(yàn),相應(yīng)的有效應(yīng)力的增大也超過離心機(jī)試驗(yàn),結(jié)果表明現(xiàn)場工程的排水效果要好于離心機(jī)試驗(yàn)。運(yùn)用離散元對離心機(jī)試驗(yàn)做流固耦合分析,無論是排水體間距2.6m,還是1.3m的兩種情況,滲流場中水的運(yùn)動(dòng)的基本方向都是向下的,而位移場中土顆粒的方向也是向下的。兩種情況的結(jié)果對比表明,間距1.3m情況下的固結(jié)效果要好于間距2.6m的情況。通過對離心機(jī)間距2.6m情況進(jìn)行進(jìn)一步研究,本文推導(dǎo)了現(xiàn)場模型的離散元模型。結(jié)果表明,滲流場中水的流動(dòng)方向基本是水平的,模型左右兩邊的水分別向左右兩邊流向排水板。位移場中土顆粒的運(yùn)動(dòng)仍然以向下為主,不過受到流體體積力的影響,有一些向左右兩邊運(yùn)動(dòng)的趨勢。從沉降來看,表面沉降比其他模擬值更接近于現(xiàn)場工程的實(shí)測值,孔隙率的變化也更大。無論是實(shí)測值還是模擬值,都證明對粉質(zhì)粘土層的加固效果是最好的,達(dá)到了重點(diǎn)加固軟土層的目的。
[Abstract]:Based on Xingheng high speed field engineering and centrifuge test, this paper makes a deep analysis on the consolidation of soft soil roadbed by vacuum surcharge combined preloading. The settlement results show that the settlement of centrifuge is first fast and then rapidly slowed down, and the settlement rate of site engineering is gradually slowed down. From the results of pore water pressure and effective stress of soil, with the increase of depth, the value of pore pressure increases, and the effective stress value decreases. The dissipation value of pore pressure of field engineering is larger than that of centrifuge test. The results show that the drainage effect of field engineering is better than that of centrifuge test. The fluid solid coupling analysis of centrifuge test with discrete element is carried out. In both the case of drainage body spacing of 2.6 m and 1.3 m, the basic direction of water movement in seepage field is downward, and the direction of soil particle is downward in displacement field. The comparison of the results of the two cases shows that the consolidation effect is better at 1.3m distance than in the case of 2.6m spacing. In this paper, the discrete element model of the field model is derived through the further study of the centrifuge spacing of 2.6 m. The results show that the flow direction of water in the seepage field is basically horizontal, and the water on the left and right sides of the model flows to the drainage plate respectively. In the displacement field, the movement of soil particles is still mainly downward, but influenced by the volume force of the fluid, there are some trends of moving to the left and right sides. From the settlement point of view, the surface settlement is closer to the measured value of field engineering than other simulated values, and the change of porosity is greater. Both the measured and simulated values prove that the reinforcement effect of silty clay layer is the best, and the purpose of strengthening soft soil layer is achieved.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU472.33

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