摘要
为了合理分析定向渗流诱导的非均质冻结壁的力学特性,将冻结壁最迟交圈的位置视为“危险截面”,通过分段等效的方法结合温度特征点的分布规律,得出该截面的温度曲线表达式;根据冻土力学参数与冻结温度的线性关系,将冻结壁视为随温度函数变化的非均质材料;分别基于M-C准则、D-P准则、广义Tresca准则及双剪强度准则,推导得出定向渗流诱导的非均质冻结壁应力计算公式。基于该公式,结合实际冻结方案的设计参数对冻结壁的力学特性进行计算分析。计算结果表明:冻结壁的承载力随着水流速度的增大而减小,当水流速度为5m·d时,基于M-C、D-P、广义Tresca、双剪强度准则计算得出的弹性极限承载力以及塑性极限承载力分别为2.480、2.462、2.741、3.202以及4.349、4.318、4.561、5.779;当地下水流速增加至10m·d时,对应的弹性极限承载力以及塑性极限承载力降低至2.087、2.085、2.203、2.784以及3.700、3.707、3.908、4.939。冻结壁的径向应力随着相对半径r的增大而增大,而环向应力的分布具有明显的区域差异性;在弹性极限状态下,冻结壁的环向应力的最大值出现在靠近冻结壁中间的位置;在塑性极限状态下,冻结壁的环向应力的最大值出现在冻结壁的分区界线(r=1.685)处。
In order to reasonably analyze the mechanical properties of the heterogeneous frozen wall induced by directional seepage,the latest closure position of the frozen wall under the action of groundwater was regarded as the“dangerous section”,combining the piecewise equivalent method with the temperature characteristic points,the temperature curve expression of the frozen wall of this section was obtained. According to the linear relationship between mechanical parameters of frozen soil and freezing temperature,the frozen wall was regarded as heterogeneous material whose property changed with temperature function. Based on the M-C criterion,D-P criterion,generalized Tresca criterion and double shear strength criterion,the stress calculation formulas of heterogeneous frozen wall induced by directional seepage were derived. Basing on the formulas and the design parameters of freezing scheme,the mechanical property of the frozen wall was calculated and analyzed. The calculation results showed that:the bearing capacity of the frozen wall decreased with the increase of flow rate. At the flow rate of5 m·d,the elastic ultimate bearing capacity and the plastic ultimate bearing capacity were2.480,2.462,2.741,3.202 and4.349,4.318,4.561,5.779,which were calculated based on M-C、D-P、generalized Tresca、double shear criterion,respectively. When the flow rate increased to10 m·d,the corresponding elastic ultimate bearing capacity and plastic ultimate bearing capacity decreased to2.087,2.085,2.203,2.784 and3.700,3.707,3.908,4.939. The radial stress of the frozen wall increased with the increase of the relative radius r,while the variation law of hoop stress in different regions was different. In the elastic limit state,the maximum value of hoop stress of the frozen wall appeared near the middle of the frozen wall. While in the plastic limit state,the maximum value of hoop stress appeared at the partition boundary(r=1.685)of the frozen wall.
作者
王彬
荣传新
程桦
蔡海兵
WANG Bin;RONG Chuanxin;CHENG Hua;CAI Haibing(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Safety Science and Engineering Postdoctoral Research Station,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Postdoctoral Research Station,China Coal Mine Construction Group Co.,Ltd.,Hefei 230091,China)
出处
《冰川冻土》
CSCD
北大核心
2022年第3期1011-1020,共10页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(51878005)
安徽省自然科学基金项目(2108085QE251)
中国博士后基金项目(2021M703621)
安徽高校自然科学研究项目(KJ2021A0425)
安徽理工大学校级研究重点项目(自然科学类)(xjzd2020-018)
安徽理工大学高层次人才引进基金项目(13200403)资助。
关键词
冻结壁
地下水
弹塑性分析
极限承载力
强度准则
frozen wall
groundwater
elastic-plastic analysis
ultimate bearing capacity
strength criterion
