發(fā)布時(shí)間：2018-10-24 14:37

【摘要】：圣蓮島過江隧道施工開挖降水工程可能影響地下水的資源功能,導(dǎo)致地下水位的下降,可能使區(qū)域內(nèi)自然環(huán)境及生態(tài)環(huán)境受到影響,地下水流場(chǎng)系統(tǒng)的改變,引起內(nèi)湖水位下降,居民飲用水供應(yīng)困難等問題。 本文結(jié)合工程地質(zhì)背景及區(qū)域水文地質(zhì)條件,對(duì)過江隧道工程降水方案進(jìn)行了初步設(shè)計(jì)。通過工程降水方式的比選,項(xiàng)目選用管井井點(diǎn)降水方式,并根據(jù)其設(shè)計(jì)原理進(jìn)行了初步降水方案設(shè)計(jì),根據(jù)不同的地質(zhì)情況本文將過江隧道分為三段進(jìn)行了分段設(shè)計(jì)�？紤]施工期間圣蓮島內(nèi)湖與本項(xiàng)目管井降水的相互影響,圣蓮島出口段(LAK0+800～LAK0+1060)影響半徑計(jì)算值為658m,影響半徑較大對(duì)島嶼及內(nèi)湖的地下水影響較大,因此通過目標(biāo)函數(shù)法：以工程造價(jià)與環(huán)境經(jīng)濟(jì)損失之和最小建立目標(biāo)函數(shù),以基坑內(nèi)水位降深、單井出水量大小為約束條件,求解最少的降水井、最小的抽水量對(duì)隧道出口段進(jìn)行降水方案優(yōu)化,并通過數(shù)值模擬方法對(duì)優(yōu)化降水井布置進(jìn)行預(yù)測(cè),分析了隧道周圍可能發(fā)生的地表沉降情況和區(qū)域地下水資源量的影響,并提出了相應(yīng)地下水環(huán)境保護(hù)措施。 通過Visual MODFLOW對(duì)降水方案的水位降深預(yù)測(cè)可知,本項(xiàng)目降水方案影響半徑與庫薩金潛水公式計(jì)算出的降水影響半徑基本一致,表示本項(xiàng)目降水方案可行。隧道出口優(yōu)化段顯示,沿著隧道出口方向地下水位降低幅度變緩,垂直與隧道出口兩側(cè)水位下降幅度相對(duì)較大,方案的優(yōu)化避開了本隧道段降水對(duì)圣蓮島內(nèi)湖的水位的影響,從最大程度上降低了隧道出口段井點(diǎn)降水對(duì)周圍地下水環(huán)境的影響,使地下水水位的降低趨勢(shì)發(fā)生變化,表示本項(xiàng)目研究的工程降水優(yōu)化方案可行。
[Abstract]:The excavation and dewatering project of Shenglian Island Crossing River Tunnel may affect the function of groundwater resources, lead to the decrease of groundwater level, may affect the natural and ecological environment in the area, and change the groundwater flow field system. Causes the lake water level to fall, the resident drinking water supply difficulty and so on question. Based on the engineering geological background and regional hydrogeological conditions, the preliminary design of the dewatering scheme for the cross-river tunnel project is carried out in this paper. Through the comparison and selection of engineering dewatering methods, the project selects the well point dewatering method for pipe wells, and designs the preliminary dewatering scheme according to its design principle. According to the different geological conditions, this paper divides the cross river tunnel into three sections to carry on the section design. Considering the interaction between the lake in Shenglian Island and the precipitation of the pipe well in this project during construction, the calculated value of the influence radius of LAK0 800~LAK0 1060 is 658m, and the influence radius is larger to the groundwater of the island and the inner lake. Therefore, the objective function is established by using the objective function method: the minimum sum of engineering cost and environmental and economic losses is taken as the objective function, and the water level in the foundation pit is lowered and the water output of a single well is taken as the constraint condition to solve the minimum precipitation well. The minimum pumping amount is used to optimize the precipitation scheme of the tunnel exit section, and the optimal precipitation well layout is predicted by numerical simulation method. The possible surface subsidence around the tunnel and the influence of regional groundwater resources are analyzed. The corresponding environmental protection measures for groundwater are put forward. The prediction of water level drop by Visual MODFLOW shows that the influence radius of precipitation scheme of this project is basically consistent with that calculated by Kuzagin's diving formula, which indicates that the precipitation scheme of this project is feasible. The optimized section of tunnel exit shows that the decrease of groundwater level along the direction of tunnel exit becomes slower, and the water level on both sides of vertical and tunnel exits is relatively large. The optimization of the scheme avoids the influence of precipitation in this tunnel section on the water level of the lake in Shenglian Island. The influence of well point precipitation on the surrounding groundwater environment is reduced to the greatest extent, and the trend of groundwater level decrease is changed, which indicates that the project precipitation optimization scheme studied in this project is feasible.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.49

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