發(fā)布時間：2018-04-13 06:49

  本文選題：土壓平衡盾構(gòu) + 復(fù)合地層�。� 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：隨著城市的高速發(fā)展,我國各大中城市地鐵建設(shè)進(jìn)入高峰期,盾構(gòu)法因其高效、安全性高、對周圍環(huán)境影響小等特點而被廣泛的使用。在市區(qū)經(jīng)常會遇到盾構(gòu)下穿建筑的情況,下穿時降低地面沉降,保證建筑物的安全成為重中之重。渣土改良和換刀地點的選取是保證盾構(gòu)順利下穿的關(guān)鍵技術(shù)。本文根據(jù)深圳地鐵7號線福民站~皇崗口岸站盾構(gòu)區(qū)間地質(zhì)情況,確定改良劑、試驗樣土和渣土改良試驗設(shè)計,通過坍落度、滲透和電機(jī)攪拌試驗,得出不同地質(zhì)情況的最佳泡沫添加比。將試驗結(jié)果應(yīng)用到現(xiàn)場進(jìn)行驗證,通過對比渣土改良前后,渣土溫度、盾構(gòu)停機(jī)后土倉壓力變化和渣土狀態(tài),得出試驗結(jié)果可靠。將試驗結(jié)果應(yīng)用到盾構(gòu)掘進(jìn)渣土改良中,并記錄正面滾刀的磨損量。根據(jù)滾刀的工作原理和磨損機(jī)理,建立滾刀壽命預(yù)測模型;對比滾刀磨損的實測值和模型預(yù)測值,兩者相差不大,證明該模型是合理的;通過該模型,得出不同安裝半徑正面滾刀的最大掘進(jìn)距離,并找出所有滾刀中最短掘進(jìn)距離。再根據(jù)下穿建筑物段的長度、滾刀最短掘進(jìn)距離和盾構(gòu)停機(jī)影響范圍,確定了最佳換刀地點。盾構(gòu)下穿時,對地面建筑物沉降、隧道拱頂沉降和水平收斂進(jìn)行監(jiān)測,監(jiān)測結(jié)果滿足規(guī)范要求,盾構(gòu)順利掘進(jìn),建筑物安全,說明盾構(gòu)下穿前各項工作準(zhǔn)備較充分,渣土改良泡沫添加比和滾刀壽命預(yù)測模型準(zhǔn)確。本文提出的渣土改良方案和滾刀壽命預(yù)測模型,降低了盾構(gòu)下穿建筑物的風(fēng)險。研究成果可以很好的與實際盾構(gòu)施工結(jié)合起來,為今后類似工程起到指導(dǎo)作用。
[Abstract]:With the rapid development of cities, subway construction in large and medium-sized cities in China has entered the peak period. The shield method has been widely used because of its high efficiency, high safety and little impact on the surrounding environment.In the urban area, it is often encountered under shield tunneling to reduce the ground subsidence and to ensure the safety of buildings becomes the top priority.The improvement of residual soil and the selection of tool changing location are the key techniques to ensure the smooth penetration of shield tunneling.According to the geological conditions of shield section of Fumin Station ~ Huanggang Port Station on Shenzhen Metro Line 7, the paper determines the improver, test sample soil and residue soil improvement test design, through slump, penetration and motor stirring test,The optimum foam addition ratio for different geological conditions is obtained.The test results were applied to the field to verify. By comparing the residual soil temperature before and after the residual soil improvement, the pressure changes of the silo and the state of the residual soil after the shield machine stopped, the test results were obtained to be reliable.The test results are applied to the residual soil improvement of shield tunneling, and the wear rate of the front hob is recorded.According to the working principle and wear mechanism of hob, the prediction model of hob life is established, the difference between the measured value of hob wear and the predicted value of model is not different, it is proved that the model is reasonable.The maximum driving distance of front hob with different mounting radius is obtained, and the shortest driving distance of all hobs is found out.According to the length of the underpass building section, the shortest driving distance of hob and the influence range of shield machine stop, the optimal tool changing location is determined.The ground building settlement, tunnel dome settlement and horizontal convergence are monitored when the shield is driven under the shield. The monitoring results meet the requirements of the specification, the shield tunneling smoothly, the building safety, which shows that the preparation of the work before the shield tunneling is quite adequate.The modified foaming ratio of residual soil and the prediction model of hob life are accurate.In this paper, the residual soil improvement scheme and hob life prediction model are proposed to reduce the risk of penetration under shield.The research results can be well combined with the actual shield construction, and play a guiding role for similar projects in the future.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.43

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