本文選題：地下水滲流場(chǎng) + 地下空間修建��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：天府新機(jī)場(chǎng)地下空間開(kāi)挖具有其空間結(jié)構(gòu)上與地質(zhì)條件上的獨(dú)特性。地下空間多層且為交叉性交通走廊:第一層為埋深-8m的綜合交通樞紐,第二層地鐵車站頂板高程-9.42m,底板高程-11.1m,第三層為地鐵與高鐵車站,埋深-23.3m。地下空間開(kāi)挖深且布局交錯(cuò)加大了地下空間建設(shè)難度。天府新機(jī)場(chǎng)地處龍泉山以東,沱江以西,場(chǎng)區(qū)內(nèi)丘陵遍布,水塘密集,地表水十分豐富。由于新機(jī)場(chǎng)位于簡(jiǎn)陽(yáng)鼻狀背斜之西北翼,地層展布為產(chǎn)狀平緩的單斜砂泥巖互層狀地層,雖紅層區(qū)賦水條件相對(duì)較差,但場(chǎng)區(qū)內(nèi)揭露的局部弱承壓水使場(chǎng)區(qū)內(nèi)水文地質(zhì)條件變得復(fù)雜。結(jié)合以上特點(diǎn),天府新機(jī)場(chǎng)地下空間開(kāi)挖對(duì)滲流場(chǎng)的影響較為復(fù)雜,每一步工況的細(xì)微差別都影響著滲流場(chǎng)的波動(dòng)。本文根據(jù)對(duì)研究區(qū)內(nèi)地質(zhì)條件、水文地質(zhì)條件、地下工程概況等資料,利用ModFlow模擬了地下水滲流場(chǎng)在不同工況下的變化,并大膽假設(shè),減少不必要的施工步驟,觀察是否會(huì)影響周邊地下水環(huán)境的巨變,以此為施工方案提出合理的優(yōu)化措施。根據(jù)一系列的模擬結(jié)果得到以下結(jié)論:(1)場(chǎng)平后蓮花水庫(kù)小支流被填埋,填埋后由地下水排泄區(qū)演變?yōu)榈叵滤难a(bǔ)給—徑流區(qū),地下水與蓮花水庫(kù)、金雞河與舉人河的補(bǔ)排關(guān)系不變,但補(bǔ)給徑流強(qiáng)度減弱。由于場(chǎng)平強(qiáng)烈改變了場(chǎng)地內(nèi)地形地貌,使地下水分水嶺消失,地下水局部壅高,壅高值0.04m。(2)場(chǎng)平后應(yīng)先將基坑內(nèi)水位降至基坑底部以下0.5m后再開(kāi)挖,模擬結(jié)果表明,基坑降水影響半徑與濾管長(zhǎng)度呈正比,三層基坑降水影響半徑約270~650m,距離地表水系較遠(yuǎn),可不設(shè)置止水帷幕。(3)基坑降水將導(dǎo)致地下水滲流場(chǎng)形態(tài)扭轉(zhuǎn),并為地下水提供了新的排泄途徑,地下構(gòu)筑物對(duì)地下水的阻攔作用被削弱。單斜狀砂泥巖互層結(jié)構(gòu)導(dǎo)致部分地下水順層流動(dòng),第一層與第二層基坑降水會(huì)加快地下結(jié)構(gòu)迎水面的徑流速度。(4)由于第三層地鐵與高鐵車站的修建僅減小了原過(guò)水?dāng)嗝娴?%,且與地下水流向呈大角度相交,該層車站的修建對(duì)地下水的攔截作用稍弱,地下水滲流場(chǎng)呈地下結(jié)構(gòu)迎水面水位較高,背水面水位較低的形態(tài),但未出現(xiàn)地下水壅高現(xiàn)象。(5)第二層地鐵車站位于砂巖層,過(guò)水?dāng)嗝鏈p少了19.87%,且車站長(zhǎng)軸方向與地下水順層流呈90°交角,因此與第三層車站相比,該層對(duì)地下水的阻攔作用略有提高。當(dāng)?shù)诙䦟榆囌九c第三層車站同時(shí)存在,地下構(gòu)筑物迎水面地下水位高于背水面,二者共同攔截了來(lái)自研究區(qū)北部的徑流,高水位區(qū)域滲流場(chǎng)形態(tài)與地下構(gòu)筑物輪廓一致。(6)與第三層基坑回填相比,第二層基坑上部回填對(duì)地下水滲流場(chǎng)的恢復(fù)更有利�；踊靥詈�,第二層車站迎水面地下水位降低1.03m,而第三層基坑回填后僅下降了0.33m。(7)運(yùn)營(yíng)階段內(nèi),由于路面硬化截?cái)嗔说叵滤邮芙涤耆霛B補(bǔ)給與蒸發(fā)排泄途徑,地下水僅可以向周邊河流排泄,因此水位總體呈下降趨勢(shì),高水位區(qū)域漸漸消散。
[Abstract]:The excavation of the underground space of the Tianfu new airport is unique in its spatial structure and geological conditions. The underground space is multi-layered and intersecting traffic corridor: the first layer is the integrated transportation hub of buried depth -8m, the top elevation -9.42m of the second storey subway station, the floor elevation -11.1m, the third floor of the subway and the high speed railway station, and the underground space of the buried depth of the underground space. The new airport is located in the east of the Longquan mountain, west of the Tuojiang River, the hilly area in the field area, the dense water pool and the rich surface water. The formation of the new airport is located in the north-west wing of the nose like anticline in Jianyang, and the formation is a flat and gentle monoclinic sandstone mudstone interbedded stratum, although the water conditions in the red layer are provided. Relatively poor, but the local weak confined water exposed in the field makes the hydrogeological conditions complex in the field area. Combined with the above characteristics, the excavation of the underground space of the Tianfu new airport has a complicated influence on the seepage field, and the subtle differences in every step of the working condition affect the fluctuation of the seepage field. By using ModFlow to simulate the change of groundwater seepage field under different working conditions, and to boldly assume, reduce unnecessary construction steps, observe whether it will affect the huge change of the surrounding groundwater environment, and put forward the reasonable optimization measures for the construction scheme, and get the following conclusions according to a series of simulation results: (1 After field leveling, the small tributaries of Lianhua reservoir were landfilled, and the groundwater discharge area became the recharge runoff area after the landfill, and the relationship between the groundwater and Lianhua reservoir, the relationship between the Golden Chicken River and the lift river was not constant, but the intensity of the recharge runoff was weakened. The water level in the foundation pit should be reduced to the bottom of the foundation pit below 0.5m after the backfire of 0.04m. (2). The simulation results show that the influence radius of the dewatering of the foundation pit is directly proportional to the length of the filter tube, the influence radius of the three layer foundation pit precipitation is about 270~650m, and the waterstop curtain is far away from the surface water system. (3) the groundwater seepage will lead to the seepage of the foundation pit. The field form is torsional and provides a new way for groundwater discharge. The blocking effect of underground structures on groundwater is weakened. The interlayer structure of monoclinic sand mudstone leads to partial groundwater flow. The first and second layers of foundation pit precipitation will speed up the runoff speed of the underground structure at the water surface. (4) due to the repair of the third layer subway and the high speed railway station. It only reduced 7% of the original water crossing section, and intersected with the groundwater flow to a large angle. The building of the station has a weak intercepting effect on the groundwater. The groundwater seepage field is in the form of high water level at the surface of the surface of the surface of the underground structure and the low water level on the back surface, but there is no groundwater backwater. (5) the second layer subway station is located in the sandstone layer and over water. The cross section of the station is reduced by 19.87%, and the direction of the long axis of the station is 90 degrees with the subsurface laminar flow. Therefore, compared with the third story station, the barrier effect on the groundwater is slightly improved. When the second story station and the third station are at the same time, the groundwater level of the underground structures is higher than the back surface, and the two intercepts the northern part of the study area. The flow field of the high water level is in accordance with the outline of the underground structure. (6) compared with the backfilling of the third layer foundation pit, the upper backfilling of the second layer foundation pit is more favorable to the recovery of the groundwater seepage flow. After the foundation pit backfilling, the water table of the second floors of the station is reduced by 1.03m, and the third layer foundation pit backfill only drops in the 0.33m. (7) operation stage. Because the pavement hardening has truncated the groundwater to receive rainfall infiltration recharge and evaporation, the groundwater can only be excreted to the surrounding rivers, so the water level is generally declining, and the high water level area gradually dissipates.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：V351.1;P641.2

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