本文選題：基坑工程　切入點(diǎn)：降水開挖　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,城市建設(shè)日益加快,基坑施工問題日益突出,為了有效把握施工進(jìn)度、改善降水開挖對基坑施工影響、緩解基坑降水對周邊環(huán)境影響,因此選取建設(shè)環(huán)境相對典型的城中村改造項目某回遷樓基坑作為分析對象,按照施工要求,對太原市的某基坑工程降水開挖過程做了數(shù)值模擬,詳細(xì)分析了降水開挖對基坑周邊環(huán)境產(chǎn)生的影響,為本基坑工程的順利施工提出參考依據(jù),也為下一步的基坑降水工程積累了經(jīng)驗(yàn)。為了研究降水開挖中各個參數(shù)對周邊環(huán)境的影響,本文詳細(xì)介紹了地下水滲流基本理論和基坑降水理論。采用FLAC3D建立模型,采用流固耦合的方式進(jìn)行計算,得出了相關(guān)參數(shù)的影響作用的大小。⑴以太原市的某基坑工程作為研究對象,根據(jù)巖土勘察結(jié)果和試驗(yàn)報告,然后利用FLAC3D有限差分軟件,對比了未開挖前降水情況下與開挖降水過程后基坑中孔隙水壓力、基坑水平位移和豎向變形的變化情況。并把數(shù)值模擬所得結(jié)果與實(shí)際監(jiān)測進(jìn)行了對比。⑵對太原某基坑工程進(jìn)行考慮流固耦合情況下的數(shù)值模擬分析,應(yīng)用FLAC3D程序分析了工程降水引起基坑周邊地面變形的規(guī)律,包括止水帷幕深度、抽水井深度、抽水井井距、回灌井?dāng)?shù)量等因素對基坑周邊地面變形產(chǎn)生的影響。根據(jù)上述的分析得出結(jié)論:⑴基坑降水使土體孔隙水壓力逐漸下降,形成“降水漏斗”。受止水帷幕作用,基坑外部孔隙水壓力降幅較小,基坑開挖工序?qū)油獠客馏w孔隙水壓力的變化沒有影響。⑵模擬所得基坑內(nèi)外地面沉降、基坑水平變形分布規(guī)律與實(shí)測值基本吻合,誤差在允許范圍之內(nèi)。⑶止水帷幕深度變化時,開挖前降水過程中,帷幕深度對基坑內(nèi)部孔隙水壓力分布、基坑內(nèi)部豎向位移的影響可以忽略不計,在基坑外部,帷幕深度越大,其止水效果越好,受地面最大沉降量和沉降范圍越小。⑷當(dāng)抽水井深度超過18m后,基坑內(nèi)部的孔隙水壓力降幅增加量有限,當(dāng)抽水井深度超過帷幕深度時,基坑外部部分地下水直接平行進(jìn)入抽水井,使得基坑外部土體發(fā)生較大沉降,僅提高降水井深度來增強(qiáng)基坑降水效果,一定范圍內(nèi)是不合理的。⑸抽水井井距為10m和12m時,抽水完成后,基坑內(nèi)部孔隙水壓力分布基本相同,隨著井距的繼續(xù)增加,其抽水能力將無法滿足基坑開挖的需要,因此,實(shí)際工程中應(yīng)該合理的選擇井距。⑹對于設(shè)置回灌井,在止水帷幕下端,回灌井?dāng)?shù)量越多,該處孔隙水壓力的變化越小,地面沉降大幅度的降低,此外,回灌井的布設(shè)還縮小沉降的影響范圍。
[Abstract]:At present, urban construction is speeding up day by day, and the problem of foundation pit construction is becoming increasingly prominent. In order to effectively grasp the construction progress, improve the influence of dewatering excavation on foundation pit construction and alleviate the impact of foundation pit dewatering on the surrounding environment, Therefore, the foundation pit of a return building which is a typical urban village reconstruction project is selected as the analysis object. According to the construction requirements, the process of dewatering excavation of a foundation pit in Taiyuan city is numerically simulated. The influence of dewatering excavation on the surrounding environment of foundation pit is analyzed in detail, which provides a reference basis for the smooth construction of this foundation pit project. In order to study the influence of various parameters on the surrounding environment, the basic theory of groundwater seepage and the theory of foundation pit dewatering are introduced in detail in this paper. FLAC3D is used to establish the model. The fluid-solid coupling method is used to calculate, and the magnitude of the influence of relevant parameters is obtained. 1. Taking a foundation pit project in Taiyuan as the research object, according to the results of geotechnical investigation and test report, and then using FLAC3D finite difference software, The pore water pressure in foundation pit before excavation and after excavation is compared. The variation of horizontal displacement and vertical deformation of foundation pit is analyzed. 2. The numerical simulation results are compared with the actual monitoring results. 2. The numerical simulation analysis of a foundation pit project in Taiyuan considering fluid-solid coupling is carried out. The rules of ground deformation around foundation pit caused by engineering dewatering are analyzed by using FLAC3D program, including the depth of sealing curtain, the depth of pumping well, the distance of pumping well. Based on the above analysis, it is concluded that the dewatering of foundation pit at 1 / 1 makes the pore water pressure of soil gradually decrease and form a "dewatering funnel". The decrease of pore water pressure outside the foundation pit is relatively small, and the variation of pore water pressure of soil outside the foundation pit is not affected by the excavation procedure. 2. The ground subsidence inside and outside the foundation pit is simulated, and the horizontal deformation distribution law of the foundation pit is basically consistent with the measured value. In the process of dewatering before excavation, the influence of curtain depth on pore water pressure distribution and vertical displacement of pit can be ignored when the error is within the allowable range of .3 depth of waterproof curtain. The greater the depth of curtain is outside the foundation pit, the greater the depth of curtain is. The better the sealing effect is, the smaller the maximum subsidence and settlement range are. 4. When the depth of pumping well exceeds 18 m, the increase of pore water pressure in foundation pit is limited, and when the depth of pumping well exceeds the depth of curtain, the increase of pore water pressure is limited. The underground water from the outside of the foundation pit enters the pumping well in parallel directly, which makes the soil in the outside of the foundation pit settlement larger, and only increases the depth of the dewatering well to enhance the dewatering effect of the foundation pit. In a certain range, it is unreasonable that the interval between the pumping wells and the pumping wells is 10m and 12m. After pumping, the distribution of pore water pressure in foundation pit is basically the same. With the increase of well spacing, its pumping capacity will not be able to meet the needs of foundation pit excavation. At the lower end of the curtain, the more the number of recharge wells, the smaller the change of pore water pressure and the decrease of ground subsidence. In addition, the layout of recharge wells also reduces the influence range of settlement.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753.66

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 于振;常來山;潘力;米長寧;;基于FLAC數(shù)值模擬的邊坡滲流應(yīng)力耦合分析[J];金屬礦山;2016年08期

2 林國威;左人宇;陸釗;翟東格;盧鎮(zhèn)文;;流固耦合與非流固耦合在深基坑模擬中的對比分析[J];路基工程;2015年04期

3 楊博維;;基于FLAC~(3D)的深基坑開挖變形數(shù)值模擬研究[J];水資源與水工程學(xué)報;2014年02期

4 任偉明;彭麗云;劉軍;;鄰近地鐵車站的基坑開挖基于FLAC~(3D)數(shù)值模擬[J];巖土工程學(xué)報;2013年S2期

5 張曉婷;梁仁旺;相興華;李志鳶;;基坑降水對地面沉降影響因素的數(shù)值分析[J];建筑科學(xué);2013年05期

6 白慶升;屠世浩;袁永;王方田;;基于采空區(qū)壓實(shí)理論的采動響應(yīng)反演[J];中國礦業(yè)大學(xué)學(xué)報;2013年03期

7 付金偉;朱維申;曹冠華;薛偉強(qiáng);周奎;;巖石中三維單裂隙擴(kuò)展過程的試驗(yàn)研究和數(shù)值模擬[J];煤炭學(xué)報;2013年03期

8 尹吉享;薛光強(qiáng);易殿華;;地下水動力學(xué)在礦井水防治中的應(yīng)用[J];山東煤炭科技;2013年01期

9 陳國壇;尹玉華;;談地下水補(bǔ)給方法[J];科技創(chuàng)新與應(yīng)用;2012年11期

10 李濤;曲軍彪;周彥軍;;深基坑降水對周圍建筑物沉降的影響[J];北京工業(yè)大學(xué)學(xué)報;2009年12期

相關(guān)博士學(xué)位論文 前2條

1 夏煒洋;盾構(gòu)法隧道施工期流固耦合問題研究[D];西南交通大學(xué);2012年

2 宗金輝;深基坑開挖有限元模擬及現(xiàn)場實(shí)測研究[D];天津大學(xué);2006年

相關(guān)碩士學(xué)位論文 前10條

1 惠一峰;地下水源熱泵系統(tǒng)水源側(cè)故障預(yù)測診斷研究[D];西安建筑科技大學(xué);2014年

2 滿志偉;深埋輸水隧洞TBM開挖過程中圍巖穩(wěn)定性數(shù)值分析[D];浙江工業(yè)大學(xué);2014年

3 吳長春;得勝河流域均質(zhì)土壩滲流分析及防滲加固措施研究[D];合肥工業(yè)大學(xué);2010年

4 王勝群;病險土石壩滲透規(guī)律的模型試驗(yàn)與數(shù)值模擬研究[D];重慶交通大學(xué);2010年

5 王永強(qiáng);高強(qiáng)度開采條件下巷道穩(wěn)定性研究[D];太原理工大學(xué);2010年

6 孟芹;地震作用下錨索破壞模式[D];重慶交通大學(xué);2010年

7 孫鋒剛;高水位條件下基坑變形監(jiān)測分析與模擬[D];武漢理工大學(xué);2010年

8 趙明;基坑開挖降水對周圍建筑物沉降影響的研究[D];山東大學(xué);2009年

9 伊興芳;關(guān)角隧道地下水排放量對圍巖水環(huán)境影響的研究[D];蘭州交通大學(xué);2009年

10 陳俊儒;基于流固耦合的海底隧道注漿圈合理參數(shù)研究[D];中南大學(xué);2009年

，

本文編號：1639441