复杂接触条件下超长距离混凝土顶管–围岩摩擦特性及现场卡管处置验证研究
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摘要
为揭示超长距离岩石顶管法施工中卡管的形成原因,采用大型岩石直剪试验研究7类复杂接触条件下砂岩与混凝土管间的剪切摩擦特性。研究结果表明:仅考虑膨润土泥浆的接触条件的平均摩擦因数(AFC)获得全部试验结果的最优值,后期接触面的AFC可高出初始值50%～70%,其中以管外原位岩屑,膨润土泥浆与含砂废弃泥浆三者组合的AFC达到最大值。然后由试验成果及改进的经验公式对现场卡管的顶力进行预测,经与现场监测对比取得了较吻合的结果,最后依据顶力传递损耗规律提出一种临时中继间法成功将卡管问题解决,因此现场中降低管–岩接触摩阻力应首先控制管外的沉渣,避免在管外形成导致管壁摩阻力增大且减小膨润土浆液有效注射量的高黏度混合物,其次还需保证管外需有充足的注浆量。
To reveal the generation mechanism and variation law of friction resistance between the outer wall of a large section of concrete pipe string and the surrounding rock during construction via ultra-long-distance rock pipe jacking,the shear friction behaviors and mechanical mechanism between sandstone and concrete pipe string wall under seven complex contact conditions were investigated through large-scale direct rock shear tests. The results show that the optimal values of the average friction coefficient for all test results are obtained by only considering bentonite slurry contact condition. In the later stage,the average friction coefficients at the contact surface can be higher than the initial values by 50%–70%. Among them,the average friction coefficient for a combination of extra-pipe in-situ debris,bentonite slurry and sand-laden waste slurry reaches a maximum value. The jacking force needed for stuck pipes was predicted based on the test results and the modified empirical formula, which is identical to the field-monitored value. Finally, a temporary intermediate jacking station(TIJS) method for solving the pipe stuck problem was proposed based on the law of jacking force transmission loss. It is pointed out that the focus of reducing in-situ pipe-rock friction resistance should be placed firstly on controlling the extra-pipe sediment to prevent the formation of high-viscosity mixture that leads to an increase in the friction resistance of the pipe wall and a decrease in the effective injection volume of bentonite slurry. Besides,it is also necessary to ensure a sufficient grouting volume outside the pipes.
To reveal the generation mechanism and variation law of friction resistance between the outer wall of a large section of concrete pipe string and the surrounding rock during construction via ultra-long-distance rock pipe jacking,the shear friction behaviors and mechanical mechanism between sandstone and concrete pipe string wall under seven complex contact conditions were investigated through large-scale direct rock shear tests. The results show that the optimal values of the average friction coefficient for all test results are obtained by only considering bentonite slurry contact condition. In the later stage,the average friction coefficients at the contact surface can be higher than the initial values by 50%–70%. Among them,the average friction coefficient for a combination of extra-pipe in-situ debris,bentonite slurry and sand-laden waste slurry reaches a maximum value. The jacking force needed for stuck pipes was predicted based on the test results and the modified empirical formula, which is identical to the field-monitored value. Finally, a temporary intermediate jacking station(TIJS) method for solving the pipe stuck problem was proposed based on the law of jacking force transmission loss. It is pointed out that the focus of reducing in-situ pipe-rock friction resistance should be placed firstly on controlling the extra-pipe sediment to prevent the formation of high-viscosity mixture that leads to an increase in the friction resistance of the pipe wall and a decrease in the effective injection volume of bentonite slurry. Besides,it is also necessary to ensure a sufficient grouting volume outside the pipes.
引文
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[6]邵光辉,苏毅,赵志峰.均质土中钢顶管顶进稳定性的能量法分析[J].岩土工程学报,2016,38(8):1 490-1 496.(SHAO Guanghui,SU Yi,ZHAO Zhifeng.Energy method for stability of steel jacking pipes during construction in uniform soil[J].Chinese Journal of Geotechnical Engineering,2016,38(8):1 490-1 496.(in Chinese))
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[8]喻军,龚晓南.考虑顶管施工过程的地面沉降控制数值分析[J].岩石力学与工程学报,2014,33(增1):2 605-2 610.(YU Jun,GONGXiaonan.Numerical analysis of surface settlement control considering pipe jacking construction process[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Supp.1):2 605-2 610.(in Chinese))
[9]魏纲,魏新江,屠毓敏.平行顶管施工引起的地面变形实测分析[J].岩石力学与工程学报,2006,25(增1):3 299-3 304.(WEIGang,WEI Xinjiang,TU Yumin.Analysis of site monitoring of ground deformation induced by parallel pipe jacking construction[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Supp.1):3 299-3 304.(in Chinese))
[10]魏新江,魏纲.水平平行顶管引起的地面沉降计算方法研究[J].岩土力学,2006,27(7):1 129-1 132.(WEI Xinjiang,WEI Gang.Study on calculational method of ground settlement induced by level parallel pipe jacking[J].Rock and Soil Mechanics,2006,27(7):1 129-1 132.(in Chinese))
[11]魏纲,朱奎.顶管施工对邻近地下管线的影响预测分析[J].岩土力学,2009,30(3):825-831.(WEI Gang,ZHU Kui.Prediction for response of adjacent pipelines induced by pipe jacking construction[J].Rock and Soil Mechanics,2009,30(3):825-831.(in Chinese))
[12]叶艺超,彭立敏,杨伟超,等.考虑泥浆触变性的顶管顶力计算方法[J].岩土工程学报.2015,37(9):1 653-1 659.(YE Yichao,PENGLimin,YANG Weichao,et al.Calculation of jacking force for pipe-jacking considering mud slurry thixotropy[J].Chinese Journal of Geotechnical Engineering,2015,37(9):1 653-1 659.(in Chinese))
[13]张鹏,谈力昕,马保松.考虑泥浆触变性和管土接触特性的顶管摩阻力公式[J].岩土工程学报,2017,39(11):2 043-2 049.(ZHANG Peng,TAN Lixin,MA Baosong.Formulae for frictional resistance considering mud thixotropy and pipe-soil contact characteristics[J].Chinese Journal of Geotechnical Engineering,2017,39(11):2 043-2 049.(in Chinese))
[14]王双,夏才初,葛金科.考虑泥浆套不同形态的顶管管壁摩阻力计算公式[J].岩土力学,2014,35(1):159-166.(WANG Shuang,XIA Caichug,GE Jinke.Formulae of lateral friction resistance for pipe-jacking considering different forms of mud screen[J].Rock and Soil Mechanics,2014,35(1):159-166.(in Chinese))
[15]李方楠,沈水龙,罗春泳.考虑注浆压力的顶管施工引起土体变形计算方法[J].岩土力学,2012,33(1):204-208.(LI Fangnan,SHENShuilong,LUO Chunyong.Prediction approach of ground deformation induced by pipe jacking construction considering grouting pressure[J].Rock and Soil Mechanics,2012,33(1):204-208.(in Chinese))
[16]SHOU K,YEN J,LIU M.On the frictional property of lubricants and its impact on jacking force and soil-pipe interaction of pipe-jacking[J].Tunnelling and Underground Space Technology,2010,25(4):469-477.
[17]SHOU K,HSIEH C.On the behavior of the overcut and stuck effects during pipe jacking[J].Procedia Engineering,2016,165:593-601.
[18]REILLY C C,ORR T L L.Physical modelling of the effect of lubricants in pipe jacking[J].Tunnelling and Underground Space Technology,2017,63(3):44-53.
[19]YEN J,SHOU K.Numerical simulation for the estimation the jacking force of pipe jacking[J].Tunnelling and Underground Space Technology,2015,49(6):218-229.
[2]冯凌溪,郭奎英.顶管顶力计算公式的适用范围探讨[J].中国给水排水,2008,24(24):102-106.(FENG Lingxi,GUO Kuiying.Discussion on application range of jacking force formula in pipe jacking[J].China Water and Waste Water,2008,24(24):102-106.(in Chinese))
[3]魏纲,魏新江,徐日庆.顶管施工引起的挤土效应研究[J].岩土力学.2006,27(5):717-722.(WEI Gang,WEI Xinjiang,XU Riqing.Study on soil-compacting effects induced by pipe jacking construction[J].Rock and Soil Mechanics,2006,27(5):717-722.(in Chinese))
[4]魏纲,陈春来,余剑英.顶管施工引起的土体垂直变形计算方法研究[J].岩土力学,2007,28(3):619-624.(WEI Gang,CHENChunlai,YU Jianying.Study on calculating methods of soil vertical deformation induced by pipe jacking construction[J].Rock and Soil Mechanics,2007,28(3):619-624.(in Chinese))
[5]张鹏,马保松,曾聪,等.基于管土接触特性的顶进力计算模型分析[J].岩土工程学报,2017,39(2):244-249.(ZHANG Peng,MA Baosong,ZENG Cong,et al.Numerical model for jacking force based on pipe-soil contact characteristics[J].Chinese Journal of Geotechnical Engineering,2017,39(2):244-249.(in Chinese))
[6]邵光辉,苏毅,赵志峰.均质土中钢顶管顶进稳定性的能量法分析[J].岩土工程学报,2016,38(8):1 490-1 496.(SHAO Guanghui,SU Yi,ZHAO Zhifeng.Energy method for stability of steel jacking pipes during construction in uniform soil[J].Chinese Journal of Geotechnical Engineering,2016,38(8):1 490-1 496.(in Chinese))
[7]黎永索,阳军生,张可能,等.弧形密排大直径管群顶管地表沉降分析[J].中南大学学报:自然科学版,2013,44(11):4 687-4 693.(LI Yongsuo,YANG Junsheng,ZHANG Keneng,et al.Surface subsidence caused by construction of large diameter curved jacking-pipes in pipe-roof pre-construction method[J].Journal of Central South University:Science and Technology,2013,44(11):4 687-4 693.(in Chinese))
[8]喻军,龚晓南.考虑顶管施工过程的地面沉降控制数值分析[J].岩石力学与工程学报,2014,33(增1):2 605-2 610.(YU Jun,GONGXiaonan.Numerical analysis of surface settlement control considering pipe jacking construction process[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Supp.1):2 605-2 610.(in Chinese))
[9]魏纲,魏新江,屠毓敏.平行顶管施工引起的地面变形实测分析[J].岩石力学与工程学报,2006,25(增1):3 299-3 304.(WEIGang,WEI Xinjiang,TU Yumin.Analysis of site monitoring of ground deformation induced by parallel pipe jacking construction[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Supp.1):3 299-3 304.(in Chinese))
[10]魏新江,魏纲.水平平行顶管引起的地面沉降计算方法研究[J].岩土力学,2006,27(7):1 129-1 132.(WEI Xinjiang,WEI Gang.Study on calculational method of ground settlement induced by level parallel pipe jacking[J].Rock and Soil Mechanics,2006,27(7):1 129-1 132.(in Chinese))
[11]魏纲,朱奎.顶管施工对邻近地下管线的影响预测分析[J].岩土力学,2009,30(3):825-831.(WEI Gang,ZHU Kui.Prediction for response of adjacent pipelines induced by pipe jacking construction[J].Rock and Soil Mechanics,2009,30(3):825-831.(in Chinese))
[12]叶艺超,彭立敏,杨伟超,等.考虑泥浆触变性的顶管顶力计算方法[J].岩土工程学报.2015,37(9):1 653-1 659.(YE Yichao,PENGLimin,YANG Weichao,et al.Calculation of jacking force for pipe-jacking considering mud slurry thixotropy[J].Chinese Journal of Geotechnical Engineering,2015,37(9):1 653-1 659.(in Chinese))
[13]张鹏,谈力昕,马保松.考虑泥浆触变性和管土接触特性的顶管摩阻力公式[J].岩土工程学报,2017,39(11):2 043-2 049.(ZHANG Peng,TAN Lixin,MA Baosong.Formulae for frictional resistance considering mud thixotropy and pipe-soil contact characteristics[J].Chinese Journal of Geotechnical Engineering,2017,39(11):2 043-2 049.(in Chinese))
[14]王双,夏才初,葛金科.考虑泥浆套不同形态的顶管管壁摩阻力计算公式[J].岩土力学,2014,35(1):159-166.(WANG Shuang,XIA Caichug,GE Jinke.Formulae of lateral friction resistance for pipe-jacking considering different forms of mud screen[J].Rock and Soil Mechanics,2014,35(1):159-166.(in Chinese))
[15]李方楠,沈水龙,罗春泳.考虑注浆压力的顶管施工引起土体变形计算方法[J].岩土力学,2012,33(1):204-208.(LI Fangnan,SHENShuilong,LUO Chunyong.Prediction approach of ground deformation induced by pipe jacking construction considering grouting pressure[J].Rock and Soil Mechanics,2012,33(1):204-208.(in Chinese))
[16]SHOU K,YEN J,LIU M.On the frictional property of lubricants and its impact on jacking force and soil-pipe interaction of pipe-jacking[J].Tunnelling and Underground Space Technology,2010,25(4):469-477.
[17]SHOU K,HSIEH C.On the behavior of the overcut and stuck effects during pipe jacking[J].Procedia Engineering,2016,165:593-601.
[18]REILLY C C,ORR T L L.Physical modelling of the effect of lubricants in pipe jacking[J].Tunnelling and Underground Space Technology,2017,63(3):44-53.
[19]YEN J,SHOU K.Numerical simulation for the estimation the jacking force of pipe jacking[J].Tunnelling and Underground Space Technology,2015,49(6):218-229.