冻结压力大小是深厚冲积层冻结法凿井外层井壁结构设计计算的重要依据。在冻土单轴蠕变试验基础上,采用广义开尔文流变模型,以及弹性-黏弹性对应原理,建立冻结壁位移场黏弹性方程;然后考虑冻结壁与外层井壁及外围未冻土体的相互作用,推导出了作用于外层井壁上的冻结压力的数学表达式。计算结果表明:在外层井壁砌筑后的前10 d,冻结压力的理论公式计算值与实测结果平均值相差较大,约0.5 MPa;在20 d后,冻结压力趋于稳定,两者差值的绝对值在0.2 MPa以内。总之,冻结压力的理论计算值与实测结果的偏差绝对值在10％以内。因此冻结压力的理论计算公式是比较符合实际的,此公式可为冻结井的外层井壁结构设计提供依据。
Abstract
Freezing pressure is an important basis for the design and calculation of the outer wall structure of shaft sinking by freezing method in deep alluvium. On the basis of uniaxial creep test of frozen soil, the generalized Kelvin rheological model and the elastic-viscoelastic correspondence principle were adopted to establish the viscoelastic equation of displacement field of frozen wall. Then, the mathematical expression of the freezing pressure acting on the outer shaft lining is deduced by considering the interaction among the frozen wall, the outer shaft lining and the peripheral unfrozen soil. Calculation results show that 1) the calculation value by theoretical formula and from mean measured value of the freezing pressure show a big difference(about 0.5 MPa) in the first ten days after the construction of outer shaft lining masonry; 2) the freezing pressure tends to be stable after 20 days, and the absolute value of the difference between the two is less than 0.2 MPa. In a word, the absolute deviation between the theoretical and calculated values of freezing pressure is less than 10%. The theoretical calculation formula of freezing pressure is quite practical and it could provide basis for the structural design of outer shaft lining of freezing well.
关键词
冻结压力 /
广义开尔文流变模型 /
冻结法凿井 /
冻结壁 /
外层井壁
Key words
freezing pressure /
generalized Kelvin rheological model /
freezing sinking method /
frozen wall /
outer shaft lining
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] CHAMBERLAIN E J,GROVES C, PERHAM R.The Mechanical Behaviour of Frozen Earth Materials under High Pressure Triaxial Test Conditions[J].Geotechnique,1972,22 (3):469-483.
[2] WANG D Y, MA W, WEN Z, et al. Study on Strength of Artificially Frozen Soils in Deep Alluvium[J]. Tunnelling and Underground Space Technology,2008,23(4): 381-388.
[3] 姜国静,王建平,刘晓敏.超厚黏土层冻结压力实测研究[J].煤炭科学技术,2013,41(3):43-46.
[4] WANG P, ZHOU G. Frost-heaving Pressure in Geotechnical Engineering Materials During Freezing Process[J]. International Journal of Mining Science & Technology, 2017. doi: 10.1016/j.ijmst.2017.06.003.
[5] 张 驰,杨维好,杨志江,等.深厚含水基岩区立井外壁冻结压力的实测与分析[J].煤炭学报,2012,37(1):33-38.
[6] 盛天宝.特厚黏土层冻结压力研究与应用[J].煤炭学报,2010,35(4): 571-574.
[7] 王衍森,薛利兵,程建平,等.特厚冲积层竖井井壁冻结压力的实测与分析[J].岩土工程学报,2009,31(2): 207-212.
[8] 姚兆明,张秋瑾,牛连僧.基于蚁群算法的冻结重塑黏土分数阶导数西原模型分析[J].raybet体育在线
院报,2016,33 (7): 81-86.
[9] 荣传新,王秀喜,程 桦.深厚冲积层冻结壁和井壁共同作用机理研究[J].工程力学,2009,26(3):235-239.
[10]NOVIKOV F Y. Pressure of Thawing Soils on the Concrete Lining of Vertical Mine Shafts[J]. Engineering Geology,1979,13(4): 277-286.
[11]杨俊杰.深厚粘土层冻结井外壁设计的一种新方法[J].煤矿设计,1997,44(7): 3-6.
[12]杨俊杰.考虑地层抗力时的外层井壁内力计算[J].煤炭工程,2002,49(2): 53-55.
[13]AULD F A. Design and Installation of Deep Shaft Linings in Ground Temporarily Stabilized by Freezing [C]∥ISSMFE.Proceedings of the Fifth International Symposium on Ground. Nottingham, July 26-27, 1988: 255-272.
[14]SUGIHARA K, YOSHIOKA H, MATSUI H, et al. Preliminary Results of a Study on the Responses of Sedimentary Rocks to Shaft Excavation [J]. Engineering Geology, 1993, 35(3/4): 223-228.
[15]王衍森,文 凯.深厚表土中冻结壁与井壁相互作用的数值分析[J].岩土工程学报,2014,36(6):1142-1146.
[16]胡向东.卸载状态下冻结壁外载的确定[J].同济大学学报,2002,30(1): 6-10.
[17]胡向东.卸载状态下与周围土体共同作用的冻结壁力学模型[J].煤炭学报,2001,26(5): 507-511.
基金
国家自然科学基金项目(51374010,51474004)
PDF(1160 KB)
