深层滑坡体特长抗滑桩施工监测与数值模拟分析
发布时间：2018-12-25 19:51
【摘要】：本文以奉溪高速大坪滑坡治理工程为依托，对深层滑坡监测方案进行了设计、对监控量测成果进行了总结分析、采用Midas/GTS有限元软件对特长抗滑桩的施工过程和滑坡体治理前后的稳定性进行了模拟计算，并结合现场实测数据对特长抗滑桩的受力分布及滑坡加固效果进行了评价。 研究内容与方法： (1)通过查阅国内外滑坡体监测方案的设计，结合大坪滑坡的实际地质地貌情况，对大坪滑坡进行全面的监测方案设计。 (2)设置两个监测项目对深层滑坡体进行监测：一是采用测斜仪对其深部水平位移变化进行监测；二是采用全站仪对其坡面监测点进行位移监测。 (3)在抗滑桩护壁不同断面处，埋设钢筋计、混凝土应变计和土压力计，监测护壁的受力状态。 (4)采用Midas/GTS对特长抗滑桩的施工过程进行三维有限元模拟，分析特长抗滑桩在施工过程中护壁的受力与位移变化，总结特长抗滑桩的受力与变形规律。 (5)通过建立二维有限元模型，分自然状态下和治理以后两种工况，对滑坡体的稳定性进行分析并评价治理工程的加固效果。 主要研究成果： (1)通过对深层滑坡体的深部位移监测和坡面位移监测得出，①大坪滑坡存在15m左右深度的浅层滑面和35~40m左右深度的深层滑面；②监测结果均显示滑坡体已趋于稳定状态。 (2)通过对抗滑桩护壁内力的监测可得，C6、F4桩在30m处的钢筋轴力、混凝土应力最大，20m处的内力次大；而H3桩在40m处的内力最大，20m处内力次大；反映了滑动面深度不同且两滑动面的上下岩土体对抗滑桩推力不同，抗滑桩在滑带附近受力较集中。 (3)根据不同测斜孔位移监测结果和不同抗滑桩监测结果，，分别绘制了滑坡滑动面位置图。 (4)对特长抗滑桩施工过程的三维数值模拟，得出了抗滑桩护壁在不同深度处的受力与变形情况。由于模型的简化，所得数据与实际存在一定差距，但分布规律基本一致，大致呈水平横向“V”字，且在滑面处的数值较突出。 (5)对整个滑坡体的二维数值模拟可得，治理以后，滑坡体的最大位移由0.248m减为0.021m，稳定安全系数由0.9125变为1.4625，抗滑桩的受力与变形在合理范围之内，滑坡达到稳定状态。
[Abstract]:Based on the Fengxi high speed Daping landslide control project, this paper designs the deep layer landslide monitoring scheme, and summarizes and analyzes the monitoring and measuring results. The construction process of super-long anti-slide pile and the stability of landslide before and after treatment are simulated and calculated by using Midas/GTS finite element software, and the stress distribution of super-long anti-slide pile and the effect of landslide reinforcement are evaluated in combination with field measured data. The research contents and methods are as follows: (1) by referring to the design of landslide monitoring scheme at home and abroad and combining with the actual geological and geomorphological situation of Daping landslide, the comprehensive monitoring scheme design of Daping landslide is carried out. (2) two monitoring items are set up to monitor the deep landslide body: one is to monitor the change of horizontal displacement in the deep layer by using the inclinometer; the other is to monitor the displacement of the slope surface monitoring point by using the total station. (3) the reinforcement gauge, concrete strain gauge and soil pressure gauge are embedded at different sections of the anti-slide pile wall to monitor the stress state of the wall. (4) Midas/GTS is used to simulate the construction process of extra-long anti-slide pile by using three-dimensional finite element method, and the stress and displacement of extra long anti-slide pile during construction are analyzed, and the law of force and deformation of super-long anti-slide pile is summarized. (5) through the establishment of two-dimensional finite element model, the stability of the landslide is analyzed and the reinforcement effect of the treatment project is evaluated under natural conditions and after treatment. The main research results are as follows: (1) through the deep displacement monitoring and slope surface displacement monitoring of deep landslide, 1 the Daping landslide has a shallow slip surface with a depth of about 15 m and a deep slip surface with a depth of 35 ~ 40 m; 2 the monitoring results show that the landslide body has become stable. (2) through the monitoring of the internal force of the anti-slide pile, it can be obtained that the axial force of C _ 6F _ 4 pile is the largest at 30m, and the internal force of 20m is the second, while the internal force of H3 pile is the largest at 40m and the second largest at 20m. The results show that the different depth of sliding surface and the different thrust of the upper and lower rock and soil mass of the two sliding surfaces make the anti-slide pile more concentrated in the vicinity of the slip zone. (3) according to the displacement monitoring results of different slanting holes and the monitoring results of different anti-slide piles, the slide surface position map of the landslide is drawn respectively. (4) Three-dimensional numerical simulation of the construction process of super-long anti-slide pile is carried out, and the stress and deformation of the anti-slide pile wall at different depth are obtained. Because of the simplification of the model, there is a certain gap between the obtained data and the actual data, but the distribution law is basically consistent with the horizontal word "V", and the value at the slip surface is more prominent. (5) the two-dimensional numerical simulation of the whole landslide body can be obtained. After treatment, the maximum displacement of the landslide body is reduced from 0.248 m to 0.021 m, and the safety factor of stability is changed from 0.9125 to 1.4625. The force and deformation of the anti-slide pile are within a reasonable range. The landslide reached a stable state.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P642.22;U418.55
本文编号：2391562
[Abstract]:Based on the Fengxi high speed Daping landslide control project, this paper designs the deep layer landslide monitoring scheme, and summarizes and analyzes the monitoring and measuring results. The construction process of super-long anti-slide pile and the stability of landslide before and after treatment are simulated and calculated by using Midas/GTS finite element software, and the stress distribution of super-long anti-slide pile and the effect of landslide reinforcement are evaluated in combination with field measured data. The research contents and methods are as follows: (1) by referring to the design of landslide monitoring scheme at home and abroad and combining with the actual geological and geomorphological situation of Daping landslide, the comprehensive monitoring scheme design of Daping landslide is carried out. (2) two monitoring items are set up to monitor the deep landslide body: one is to monitor the change of horizontal displacement in the deep layer by using the inclinometer; the other is to monitor the displacement of the slope surface monitoring point by using the total station. (3) the reinforcement gauge, concrete strain gauge and soil pressure gauge are embedded at different sections of the anti-slide pile wall to monitor the stress state of the wall. (4) Midas/GTS is used to simulate the construction process of extra-long anti-slide pile by using three-dimensional finite element method, and the stress and displacement of extra long anti-slide pile during construction are analyzed, and the law of force and deformation of super-long anti-slide pile is summarized. (5) through the establishment of two-dimensional finite element model, the stability of the landslide is analyzed and the reinforcement effect of the treatment project is evaluated under natural conditions and after treatment. The main research results are as follows: (1) through the deep displacement monitoring and slope surface displacement monitoring of deep landslide, 1 the Daping landslide has a shallow slip surface with a depth of about 15 m and a deep slip surface with a depth of 35 ~ 40 m; 2 the monitoring results show that the landslide body has become stable. (2) through the monitoring of the internal force of the anti-slide pile, it can be obtained that the axial force of C _ 6F _ 4 pile is the largest at 30m, and the internal force of 20m is the second, while the internal force of H3 pile is the largest at 40m and the second largest at 20m. The results show that the different depth of sliding surface and the different thrust of the upper and lower rock and soil mass of the two sliding surfaces make the anti-slide pile more concentrated in the vicinity of the slip zone. (3) according to the displacement monitoring results of different slanting holes and the monitoring results of different anti-slide piles, the slide surface position map of the landslide is drawn respectively. (4) Three-dimensional numerical simulation of the construction process of super-long anti-slide pile is carried out, and the stress and deformation of the anti-slide pile wall at different depth are obtained. Because of the simplification of the model, there is a certain gap between the obtained data and the actual data, but the distribution law is basically consistent with the horizontal word "V", and the value at the slip surface is more prominent. (5) the two-dimensional numerical simulation of the whole landslide body can be obtained. After treatment, the maximum displacement of the landslide body is reduced from 0.248 m to 0.021 m, and the safety factor of stability is changed from 0.9125 to 1.4625. The force and deformation of the anti-slide pile are within a reasonable range. The landslide reached a stable state.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P642.22;U418.55
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