深圳復(fù)合地層對盾構(gòu)隧道襯砌管片結(jié)構(gòu)受力和變形的影響分析
發(fā)布時間：2018-09-01 14:24
【摘要】：本文以深圳地鐵11號線車公廟站—紅樹灣站和南山站—前海灣站區(qū)間盾構(gòu)隧道為依托工程,首先選擇具有代表性的基巖突起和軟硬不均的地質(zhì)條件斷面進(jìn)行數(shù)值模擬,分析對比不同工況對管片受力變形的影響；然后選擇差異風(fēng)化地層試驗斷面采用光纖光柵技術(shù)對管片表面和螺栓進(jìn)行現(xiàn)場監(jiān)測,再選擇監(jiān)測斷面進(jìn)行數(shù)值模擬分析,據(jù)此分析管片和螺栓的受力變形規(guī)律；最后將數(shù)值模擬結(jié)果與現(xiàn)場監(jiān)測數(shù)據(jù)進(jìn)行了對比。 論文取得的主要成果和結(jié)論如下： (1)選取具有基巖突起的典型斷面,分別考慮基巖突起寬度為Om,2m,4m,6m和8m五種工況進(jìn)行管片受力變形的數(shù)值模擬。分析結(jié)果表明,基巖突起對管片的不均勻沉降影響明顯；基巖突起的寬度越大,對管片的不均勻沉降影響越明顯,與基巖突起接觸的或者是基巖突起附近的管片的受力越不利。由于混凝土管片的抗拉強(qiáng)度低,隨著基巖突起寬度的增加,管片被拉裂的風(fēng)險也增大,因此將管片受拉破壞對應(yīng)的一段隧道沉降差和基巖突起寬度的乘積和40環(huán)管片長度(60m)的比值作為基巖突起引起縱向不均勻沉降的警戒值。根據(jù)計算結(jié)果,若考慮一定的安全儲備,該警戒值可取為0.3%o。 (2)選取上軟下硬地層的典型斷面,分別考慮硬巖侵入隧道為Om,1.75m,3.5m,5.25m和7m五種工況進(jìn)行數(shù)值模擬,分析管片的受力和變形,結(jié)果顯示,上軟下硬地層中,硬巖侵入開挖面越多,有利于管片的受力,但會增大隧道施工的難度。 (3)采用光纖光柵傳感器進(jìn)行了現(xiàn)場螺栓和盾構(gòu)管片的變形監(jiān)測。通過現(xiàn)場監(jiān)測數(shù)據(jù)分析,管片脫出盾構(gòu)殼體后,螺栓的軸向應(yīng)力會劇烈增大、增幅顯著,原因是水土壓力和注漿壓力對螺栓的軸向應(yīng)力影響比油缸推力的要大。由于注漿壓力的影響有滯后性,在掘進(jìn)7環(huán)管片(10.5m)后漿液凝固,螺栓受力趨于平穩(wěn)。在掘進(jìn)過程中,環(huán)向螺栓的軸向應(yīng)力比縱向螺栓的大,環(huán)向螺栓中靠近油缸的螺栓比遠(yuǎn)離油缸的螺栓的軸向應(yīng)力大,但都有足夠的安全儲備。監(jiān)測數(shù)據(jù)顯示,所有螺栓軸向應(yīng)力的最大值為345.46MPa,僅達(dá)到螺栓屈服應(yīng)力640MPa的53.98%,這說明螺栓受力處于安全狀態(tài)。 (4)通過復(fù)合地層中管片受力變形的數(shù)值模擬分析,現(xiàn)場監(jiān)測螺栓處在受力的最不利位置,說明了所確定監(jiān)測方案的合理性。在隧道開挖過程中,盾構(gòu)施工7環(huán)(10.5m)時對監(jiān)測環(huán)的錯臺影響明顯,且該7環(huán)管片位移變形大,隨后變小,最后趨于平穩(wěn)。和現(xiàn)場監(jiān)測數(shù)據(jù)相同,盾構(gòu)掘進(jìn)時縱向螺栓主要以軸向拉應(yīng)力為主；此外,壁后注漿對螺栓受力有較大影響。
[Abstract]:Based on Shenzhen Metro Line 11 Chegongmiao Station-Hongshu Bay Station and Nanshan Station-former Bay Station Shield Tunnel, the representative bedrock protrusions and sections with uneven soft and hard geological conditions are first selected for numerical simulation. This paper analyzes and compares the influence of different working conditions on the stress and deformation of the segment, then selects the section of the differential weathering stratum test section to monitor the segment surface and bolts by fiber Bragg grating technology, and then selects the monitoring section to carry on the numerical simulation analysis, and then selects the monitoring section to carry on the numerical simulation analysis. Finally, the numerical simulation results are compared with the field monitoring data. The main results and conclusions obtained in this paper are as follows: (1) A typical section with a bedrock protuberance is selected, and the stress deformation of the segment is simulated under five conditions, namely, the width of the protruding of the bedrock is Om,2m,4m,6m and the width of the protruding is 8m. The results show that the uneven settlement of the segment is obviously affected by the bedrock protrusions, and the larger the width of the bedrock protrusions, the more obvious the influence on the uneven settlement of the segments, and the more disadvantageous the stress is on the segments in contact with or near the bedrock protrusions. Because of the low tensile strength of the concrete segment, the risk of tensile crack increases with the increase of the width of the protruding of the bedrock. Therefore, the product of tunnel settlement difference and the width of bedrock bulge and the ratio of 40 annular segment length (60m) are taken as warning values of longitudinal uneven settlement caused by bedrock uplift. According to the calculation results, if a certain safety reserve is considered, the warning value should be 0.3o. (2) the typical sections of the upper soft and lower hard strata are selected, and the numerical simulation is carried out under the five working conditions of Om,1.75m,3.5m,5.25m and 7m, respectively, when the hard rock intrudes into the tunnel. The stress and deformation of the segment are analyzed. The results show that the more hard rock intrudes into the excavated surface in the upper soft and lower hard strata, the better the force of the segment is. But it will increase the difficulty of tunnel construction. (3) using fiber grating sensor to monitor the deformation of bolt and shield segment. Through the analysis of field monitoring data, the axial stress of bolt will increase dramatically after the segment is removed from shield shell, the reason is that the influence of soil and water pressure and grouting pressure on the axial stress of bolt is greater than the thrust of oil cylinder. Due to the effect of grouting pressure, the grouting fluid solidifies after driving 7 ring tube sheet (10.5m), and the force of bolt tends to be stable. In the process of driving, the axial stress of the annular bolt is greater than that of the longitudinal bolt, and the axial stress of the annular bolt near the cylinder is greater than that of the bolt far away from the cylinder, but there is sufficient safety reserve. The monitoring data show that the maximum axial stress of all bolts is 345.46 MPA, which only reaches 53.98% of the bolt yield stress 640MPa, which indicates that the bolt is in a safe state. (4) the numerical simulation analysis of the stress deformation of the segment in the composite stratum is carried out. The monitoring bolt is in the most unfavorable position of the force, which shows the rationality of the determined monitoring scheme. In the course of tunnel excavation, the influence of shield construction on the staggered platform of the monitoring ring is obvious during the 7 rings (10.5 m) of shield construction, and the displacement of the segment of the 7 rings is large, then becomes smaller, and finally tends to steady. The longitudinal bolts are mainly axial tensile stress in shield tunneling, in addition, grouting behind the wall has a great influence on the bolt force.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.43
本文編號：2217474
[Abstract]:Based on Shenzhen Metro Line 11 Chegongmiao Station-Hongshu Bay Station and Nanshan Station-former Bay Station Shield Tunnel, the representative bedrock protrusions and sections with uneven soft and hard geological conditions are first selected for numerical simulation. This paper analyzes and compares the influence of different working conditions on the stress and deformation of the segment, then selects the section of the differential weathering stratum test section to monitor the segment surface and bolts by fiber Bragg grating technology, and then selects the monitoring section to carry on the numerical simulation analysis, and then selects the monitoring section to carry on the numerical simulation analysis. Finally, the numerical simulation results are compared with the field monitoring data. The main results and conclusions obtained in this paper are as follows: (1) A typical section with a bedrock protuberance is selected, and the stress deformation of the segment is simulated under five conditions, namely, the width of the protruding of the bedrock is Om,2m,4m,6m and the width of the protruding is 8m. The results show that the uneven settlement of the segment is obviously affected by the bedrock protrusions, and the larger the width of the bedrock protrusions, the more obvious the influence on the uneven settlement of the segments, and the more disadvantageous the stress is on the segments in contact with or near the bedrock protrusions. Because of the low tensile strength of the concrete segment, the risk of tensile crack increases with the increase of the width of the protruding of the bedrock. Therefore, the product of tunnel settlement difference and the width of bedrock bulge and the ratio of 40 annular segment length (60m) are taken as warning values of longitudinal uneven settlement caused by bedrock uplift. According to the calculation results, if a certain safety reserve is considered, the warning value should be 0.3o. (2) the typical sections of the upper soft and lower hard strata are selected, and the numerical simulation is carried out under the five working conditions of Om,1.75m,3.5m,5.25m and 7m, respectively, when the hard rock intrudes into the tunnel. The stress and deformation of the segment are analyzed. The results show that the more hard rock intrudes into the excavated surface in the upper soft and lower hard strata, the better the force of the segment is. But it will increase the difficulty of tunnel construction. (3) using fiber grating sensor to monitor the deformation of bolt and shield segment. Through the analysis of field monitoring data, the axial stress of bolt will increase dramatically after the segment is removed from shield shell, the reason is that the influence of soil and water pressure and grouting pressure on the axial stress of bolt is greater than the thrust of oil cylinder. Due to the effect of grouting pressure, the grouting fluid solidifies after driving 7 ring tube sheet (10.5m), and the force of bolt tends to be stable. In the process of driving, the axial stress of the annular bolt is greater than that of the longitudinal bolt, and the axial stress of the annular bolt near the cylinder is greater than that of the bolt far away from the cylinder, but there is sufficient safety reserve. The monitoring data show that the maximum axial stress of all bolts is 345.46 MPA, which only reaches 53.98% of the bolt yield stress 640MPa, which indicates that the bolt is in a safe state. (4) the numerical simulation analysis of the stress deformation of the segment in the composite stratum is carried out. The monitoring bolt is in the most unfavorable position of the force, which shows the rationality of the determined monitoring scheme. In the course of tunnel excavation, the influence of shield construction on the staggered platform of the monitoring ring is obvious during the 7 rings (10.5 m) of shield construction, and the displacement of the segment of the 7 rings is large, then becomes smaller, and finally tends to steady. The longitudinal bolts are mainly axial tensile stress in shield tunneling, in addition, grouting behind the wall has a great influence on the bolt force.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.43
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