康定机场北段高填方边坡稳定性及场道沉降变形研究
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摘要
随着我国近几十年来经济的飞速发展和西部大开发的进行,我国加快了中西部机场建设步伐。但是我国西部多高山峻岭,山区机场地质条件复杂,一般存在高海拔、高烈度、高填方等问题,工程建设存在很多问题,需要作专门研究,本文以康定机场为例,主要研究“高填方边坡稳定和场道变形”,对其它机场建设亦有较大指导意义。主要得出以下结论:
(1)场区由冰碛土组成的粗巨粒土,分布不均匀、无层理、层位变化大为典型的不均匀地基,但是其干密度大、密实度高、渗透性好、高承载力特点,为良好的天然地基,作为填料经处理后可形成良好的地基。
(2)通过对场地原地基强夯处理研究表明,原地基块石架空区和受地下水影响区适合强夯处理,处理后能满足承载力和压实度的要求。针对填筑体单独强夯则不能满足压实要求。
(3)由变形监测成果分析可知,坡面位移较小,坡体稳定性好,位移最大地方在约束较小地方,及填方最高坡顶交界处;填筑体的沉降大,而且发展快。
(4)FLAC~(3D)三维数值模拟填筑体沉降和观测值吻合很好,H方向的差异沉降3‰左右,P方向差异沉降大约2.5‰。位置不同工后沉降不同,北段的工后沉降大概占总沉降的15%～25%。
(5)编写了FLAC~(3D)前、后处理的程序,解决了FLAC~(3D)建模困难以及无法输出等值线图问题。
(6)运用三维差分法基于强度折减理论评价康定机场高填方填筑体稳定性,并且给出了安全系数和破坏模式,使数值计算能够像传统极限平衡法一样直观,有重大工程意义。
(7)提出了新的地震波基线调零的方法,通过FLAC~(3D)动力分析,研究了边坡动力响应、加速度放大倍数规律和边坡破坏模式。
With the rapid development of economy since recent decades and western development drive, airport construction in west area has been promoted. However, it is mountainous in west of China, and the geographical conditions of mountainous airport are complicated, generally with the problems of high altitude, high intensity, high-fill, etc. There are several issues in project construction, which should be specially studied. This assay takes Kangding airport as an example, mainly on "stability of high-fill slope and pavement deformation", which will be greatly meaningful to other airports' construction. Mainly concluded as:
(1) The site is of moraine soil, which is as typical non-uniform ground base, with non-uniformity distribution, non-bedding and big change of bedding position. However, with high dry density, high compactness, good permeability, and high bearing capacity, it can be founded to good ground base as filler after treatment.
(2) According to the study of dynamic compaction of site original ground base, it shows that the stone block aerial zone of original ground base and the zone affected by groundwater is suitable for dynamic compaction, and can meet the requirements of bearing capacity and compactness after treatment. The separate dynamic compaction for filling works can not meet the requirements of compactness.
(3) According to the observation result of deformation, it shows that the displacement of slope land is smaller, the stability of slope is good, and the biggest displacement is on the jointed position between the smaller restriction and the highest slope angle of filler. The settlement of filling works is big, and develops rapidly.
(4) The settlement of filling works simulated by FLAC~(3D) 3-D value meets the observation value well. For H direction, the different settlement is about 3‰, P direction is 2.5‰. The settlement after woking is different in different position. The settlement of A bid-stage after working is 15%～25% of the total.
(5) Write the program for before and after treatment of FLAC~(3D) to solve the difficulty of constructing FLAC~(3D) model and outputting the contour plot.
(6) Apply the 3-d difference method strength reduction principle to evaluate the stability of high-fill willing works of Kangding airport, and put forward safety factor and failure mode, which makes the value calculation as intuitionistic as traditional limit equilibrium method, and is meaningful for engineering.
(7) Through FLAC~(3D) dynamic analysis, proposed the new zero-adjusting method for baseline of seismic wave, studied the side-slope dynamic response, the magnification regulation of acceleration and side-slope failure mode.
(1)场区由冰碛土组成的粗巨粒土,分布不均匀、无层理、层位变化大为典型的不均匀地基,但是其干密度大、密实度高、渗透性好、高承载力特点,为良好的天然地基,作为填料经处理后可形成良好的地基。
(2)通过对场地原地基强夯处理研究表明,原地基块石架空区和受地下水影响区适合强夯处理,处理后能满足承载力和压实度的要求。针对填筑体单独强夯则不能满足压实要求。
(3)由变形监测成果分析可知,坡面位移较小,坡体稳定性好,位移最大地方在约束较小地方,及填方最高坡顶交界处;填筑体的沉降大,而且发展快。
(4)FLAC~(3D)三维数值模拟填筑体沉降和观测值吻合很好,H方向的差异沉降3‰左右,P方向差异沉降大约2.5‰。位置不同工后沉降不同,北段的工后沉降大概占总沉降的15%～25%。
(5)编写了FLAC~(3D)前、后处理的程序,解决了FLAC~(3D)建模困难以及无法输出等值线图问题。
(6)运用三维差分法基于强度折减理论评价康定机场高填方填筑体稳定性,并且给出了安全系数和破坏模式,使数值计算能够像传统极限平衡法一样直观,有重大工程意义。
(7)提出了新的地震波基线调零的方法,通过FLAC~(3D)动力分析,研究了边坡动力响应、加速度放大倍数规律和边坡破坏模式。
With the rapid development of economy since recent decades and western development drive, airport construction in west area has been promoted. However, it is mountainous in west of China, and the geographical conditions of mountainous airport are complicated, generally with the problems of high altitude, high intensity, high-fill, etc. There are several issues in project construction, which should be specially studied. This assay takes Kangding airport as an example, mainly on "stability of high-fill slope and pavement deformation", which will be greatly meaningful to other airports' construction. Mainly concluded as:
(1) The site is of moraine soil, which is as typical non-uniform ground base, with non-uniformity distribution, non-bedding and big change of bedding position. However, with high dry density, high compactness, good permeability, and high bearing capacity, it can be founded to good ground base as filler after treatment.
(2) According to the study of dynamic compaction of site original ground base, it shows that the stone block aerial zone of original ground base and the zone affected by groundwater is suitable for dynamic compaction, and can meet the requirements of bearing capacity and compactness after treatment. The separate dynamic compaction for filling works can not meet the requirements of compactness.
(3) According to the observation result of deformation, it shows that the displacement of slope land is smaller, the stability of slope is good, and the biggest displacement is on the jointed position between the smaller restriction and the highest slope angle of filler. The settlement of filling works is big, and develops rapidly.
(4) The settlement of filling works simulated by FLAC~(3D) 3-D value meets the observation value well. For H direction, the different settlement is about 3‰, P direction is 2.5‰. The settlement after woking is different in different position. The settlement of A bid-stage after working is 15%～25% of the total.
(5) Write the program for before and after treatment of FLAC~(3D) to solve the difficulty of constructing FLAC~(3D) model and outputting the contour plot.
(6) Apply the 3-d difference method strength reduction principle to evaluate the stability of high-fill willing works of Kangding airport, and put forward safety factor and failure mode, which makes the value calculation as intuitionistic as traditional limit equilibrium method, and is meaningful for engineering.
(7) Through FLAC~(3D) dynamic analysis, proposed the new zero-adjusting method for baseline of seismic wave, studied the side-slope dynamic response, the magnification regulation of acceleration and side-slope failure mode.
引文
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