边坡加权位移反演方法及工程应用研究
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摘要
参数反演是获得岩土强度参数的重要手段,而对于分层或者含有软弱夹层的边坡,加权位移反分析是获得其土体参数的有效反演方法。利用边坡测斜数据与土体分块的基本思想,提出了一种加权方法。根据土体深部位移曲线与最小二乘原理,将边坡土体划分为若干个具有不同位移特点的块体,单个块体的位移可以用两个量进行表示:滑动位移与变形位移。将反映块体自身强度的变形位移作为加权反分析的权重,并提出了新的反演目标函数。最后,依托实际工程,利用新方法计算了边坡的强度参数,其结果与现场试验符合较好。同时,敏感度计算的结果也表明该方法的反演效果更佳。
The inversion analysis is an important way to obtain the geotechnical strength parameters,especially,for weak intercalated layer slope,weighted displacement back analysis is an effective method to get its soil parameters.Based on the inclination data and basic idea of block division,a new calculated approach for displacement weight was proposed. By displacement curve and least square method,the slope soil was divided into several blocks with different displacement characteristics. The displacement for single block could be expressed by two variables: sliding and deformation displacement. The deformation displacement,which reflects itself soil strength,was regarded as the weight of weighted back analysis. And the new inversion objective function was presented. Finally,depending on entity project,this presented method was used to calculated soil strength which matched well with the test values.Meanwhile,the sensitivity result also indicated the effectiveness of the method.
The inversion analysis is an important way to obtain the geotechnical strength parameters,especially,for weak intercalated layer slope,weighted displacement back analysis is an effective method to get its soil parameters.Based on the inclination data and basic idea of block division,a new calculated approach for displacement weight was proposed. By displacement curve and least square method,the slope soil was divided into several blocks with different displacement characteristics. The displacement for single block could be expressed by two variables: sliding and deformation displacement. The deformation displacement,which reflects itself soil strength,was regarded as the weight of weighted back analysis. And the new inversion objective function was presented. Finally,depending on entity project,this presented method was used to calculated soil strength which matched well with the test values.Meanwhile,the sensitivity result also indicated the effectiveness of the method.
引文
[1]Okui Y,Tokunaga A,Shinji M.New Back Analysis Method of Slope Stability by Using Field Measurements[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(3/4):231-234.
[2]Shang Y J,Cai J G,Hao W D,et al.Intelligent Back Analysis of Displacements Using Precedent Type Analysis for Tunneling[J].Tunnelling and Underground Space Technology,2002,17(4):381-389.
[3]Sonmez H,Ulusay R,Gokceoglu C.A Practical Procedure for the Back Analysis of Slope Failures in Closely Jointed Rock Masses[J].International Journal of Rock Mechanics and Mining Sciences,1998,35(2):219-233.
[4]Kavanagh K T,Clough R W.Finite Element Applications in the Characterization of Elastic Solids[J].International Journal of Solids and Structures.1971,7(1):11-23.
[5]Sakurai S,Ajutagawa S,Takeuchi K.Back Analysis for Tunnel Engineering as a Modern Observational Method[J].Tunnelling and Underground Space Technology Tunnelling in Japan,1983,18(2/3):185-196.
[6]Deng J H,Lee C F.Displacement Back Analysis for a Steep Slope at the Three Gorges Project Site[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(2):259-268.
[7]Zhang L L,Zhang J,Zhang L M.Back Analysis of Slope Failure with Markov Chain Monte Carlo Simulation[J].Computers and Geotechnics,2010,37(7/8):905-912.
[8]高玮.基于粒子群优化的岩土工程反分析研究[J].岩土力学,2006(5):795-798.
[9]孙志彬,杨小礼,黄阜.基于模糊数学和粒子群算法的边坡参数反分析[J].华南理工大学学报:自然科学版,2011(6):137-141.
[10]杜景灿,陆兆溱.加权位移反演法确定岩体结构面的力学参数[J].岩土工程学报,1999,21(2):74-77.
[2]Shang Y J,Cai J G,Hao W D,et al.Intelligent Back Analysis of Displacements Using Precedent Type Analysis for Tunneling[J].Tunnelling and Underground Space Technology,2002,17(4):381-389.
[3]Sonmez H,Ulusay R,Gokceoglu C.A Practical Procedure for the Back Analysis of Slope Failures in Closely Jointed Rock Masses[J].International Journal of Rock Mechanics and Mining Sciences,1998,35(2):219-233.
[4]Kavanagh K T,Clough R W.Finite Element Applications in the Characterization of Elastic Solids[J].International Journal of Solids and Structures.1971,7(1):11-23.
[5]Sakurai S,Ajutagawa S,Takeuchi K.Back Analysis for Tunnel Engineering as a Modern Observational Method[J].Tunnelling and Underground Space Technology Tunnelling in Japan,1983,18(2/3):185-196.
[6]Deng J H,Lee C F.Displacement Back Analysis for a Steep Slope at the Three Gorges Project Site[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(2):259-268.
[7]Zhang L L,Zhang J,Zhang L M.Back Analysis of Slope Failure with Markov Chain Monte Carlo Simulation[J].Computers and Geotechnics,2010,37(7/8):905-912.
[8]高玮.基于粒子群优化的岩土工程反分析研究[J].岩土力学,2006(5):795-798.
[9]孙志彬,杨小礼,黄阜.基于模糊数学和粒子群算法的边坡参数反分析[J].华南理工大学学报:自然科学版,2011(6):137-141.
[10]杜景灿,陆兆溱.加权位移反演法确定岩体结构面的力学参数[J].岩土工程学报,1999,21(2):74-77.