地裂缝活动作用下地层应力和位移传递规律研究
A study of the transfer law of formation stress and displacement induced by active ground fissures
-
摘要: 以西安地裂缝典型地段为研究对象，建立基于实际地裂缝活动方式的地质力学模型，通过FLAC3D数值模拟，研究地裂缝活动作用下地层应力和位移传递规律。结果表明：地裂缝活动作用下，地表竖向沉降变形曲线近似呈反“S”形，表现出“牵引挠曲”现象，水平位移曲线出现明显波峰现象；随着地裂缝位错量的增大，地表竖向和水平位移均逐渐增大；基于地裂缝活动引起的地表变形平均倾斜值，确定了地裂缝带影响区范围为上盘21 m和下盘13 m。地裂缝活动引起两侧地层断距由深部到浅表部逐渐减小，具有明显的变形传递衰减特征，且地层断距随埋深的变化曲线可近似概化为一个四次多项式方程。地裂缝活动导致上盘地层出现应力降低区，下盘地层出现应力增强区，上盘应力降低区范围大于下盘应力增强区，且上、下盘应力变化范围随着位错量的增大均逐渐增大。地裂缝活动作用下地裂缝两侧地层应力影响区随地层埋深的增大而增大，其与埋深之间关系近似满足三次多项式方程。研究结果可为盆地断裂控制型地裂缝发育区的工程防灾减灾提供科学依据。Abstract: Based on the typical zones of ground fissures in Xi’an, the geological mechanics model of the actual activity mode of ground fissures is established. The transfer law of formation stress and displacement under the action of active ground fissures is studied with the FLAC3D numerical simulation method. The results show that under the action of active ground fissures, the curves of ground vertical displacement exhibit an approximate reverse-S shape, indicating the phenomenon of traction deflection. The curves of horizontal displacement appear the phenomenon of an obvious peak. The vertical and horizontal displacement gradually increases with the settlement of the hanging wall of the increasing ground fissure. Based on the average ground deformation tilt values induced by ground fissures, the affected zone range of ground fissure belts is determined, which is 21 m in the hanging wall and 13 m in the football from ground fissures, respectively. The fault throw on both sides of the formation induced by ground fissures gradually decreases with the depth from deep to shallow surface, which is characterized by the obvious deformation transfer and attenuation. The curves of fault throw of formation variation with the buried depth can approximately be expressed using a quartic polynomial equation. Under the action of active ground fissures, there appears a stress reduced area in the hanging wall, which is bigger than the stress enhanced area in the footwall. The stress variation range in the hanging wall and the football gradually increase with the increasing settlement of the hanging wall. The relationship between the affected zone of the formation stress on both sides of ground fissures, which gradually increases with the increasing buried depth, and the buried depth approximately satisfies a cubic polynomial equation. The results can present a scientific basis for disaster prevention of active ground fissure zones controlled by basin faults.
-
-
[1] ［1］王景明. 地裂缝及其灾害的理论分析与应用［M］. 西安:陕西科学技术出版社，2000. ［WANG J M. Theory of ground fissures hazards and application［M］. Xi′an: Shaanxi Science and Technology Press, 2000.(in Chinese)］
[2] ［2］彭建兵,张勤,黄强兵,等. 西安地裂缝灾害［M］. 北京：科学出版社，2012. ［PENG J B, ZHANG Q, HUANG Q B, et al. Hazard of ground fissure in Xi’an［M］. Beijing: Science Press, 2012.(in Chinese)］
[3] ［3］Leonard R J. An earth fissure in southern Arizona ［J］. Journal of Geology, 1929, 37(8): 765-774.
[4] ［4］Carpenter M C. Earth-fissure movements associated with fluctuations in ground-water levels near the Picacho mountains, south-central Arizona, 1980-1984,U.S.A Geological Survey Professional Paper［C］.Washington: United States Government Printing Office,1993：497.
[5] ［5］彭建兵,陈立伟,黄强兵,等. 地裂缝破裂扩展的大型物理模拟试验研究［J］.地球物理学报,2008，(6):1826-1834. ［PENG J B, CHEN L W, HUANG Q B, et al. Large-scale physical simulative experiment on ground-fissure expansion mechanism［J］. Chinese Journal of Geophysics,2008，(6): 1826-1834.(in Chinese)］
[6] ［6］黄强兵,彭建兵,闫金凯,等. 地裂缝活动对土体应力与变形影响的试验研究［J］.岩土力学,2009,30(4): 903-908. ［HUANG Q B, PENG J B, YAN J K, et al. Model test study of influence of ground fissure movement on stress and deformation of soil mass［J］. Rock and Soil Mechanics, 2009,30(4): 903-908.(in Chinese)］
[7] ［7］石玉玲,门玉明,彭建兵,等. 西安城区地裂缝破裂扩展的数值模拟［J］. 水文地质工程地质,2008,35(6):56-60. ［SHI Y L, MEN Y M, PENG J B, et al. Numerical simulation of ground-fissure cracking and extending in Xi’an［J］. Hydrogeology & Engineering Geology, 2008, 35(6): 56-60.(in Chinese)］
[8] ［8］易学发,苏刚,王卫东. 用数值模拟研究西安地裂缝 ［J］. 水文地质工程地质,1999,26(5):33-36. ［YI X F, SU G, WANG W D. Numerical simulation of Xi’an ground-fissure［J］. Hydrogeology & Engineering Geology, 1999, 26(5): 33-36.(in Chinese)］
[9] ［9］王启耀,蒋臻蔚,彭建兵.抽水作用下先存断裂活化滑移机制研究［J］. 水文地质工程地质,2013,40(2): 108- 112. ［WANG Q Y, JIANG Z W, PENG J B. Mechanism of reactivation and slip of the preexisting fault under pumping［J］. Hydrogeology & Engineering Geology, 2013, 40(2): 108-112.(in Chinese)］
[10] ［10］GB 50007—2002 建筑地基基础设计规范［S］.2002.［GB 50007—2002 Code for design of building foundation ［S］.2002 (in Chinese)］
[11] ［11］DBJ61-6—2006 J10821—2006 西安地裂缝场地勘察与工程设计规程［S］.2006. ［DBJ61-6—2006 J10821—2006 Specification for site investigation and engineering design on Xi’an ground fractures［S］. 2006.(in Chinese)］
-
期刊类型引用(7)
1. 王鑫，李小刚，丁小强，王亚辉. 典型黄土阶地三类场地的隐伏地裂缝识别探讨. 岩土工程技术. 2023(04): 428-432 . 
百度学术
2. 徐明祥，黄强兵，王庆兵，李明锷，雷建. 西安地裂缝地段浅埋暗挖地铁隧道施工沉降规律. 水文地质工程地质. 2020(01): 161-170 . 本站查看
3. 吴玉涛，杨为民，周俊杰，于鸿坤，李晓乐，张田田，万飞鹏. 河北平原隆尧地裂缝成因机理与模式研究. 水文地质工程地质. 2020(05): 169-178 . 本站查看
4. 黄强兵，姜紫看，邓亚虹，王立新，胡士伟. 穿越地裂缝带地铁隧道结构分段长度优化研究. 水文地质工程地质. 2019(02): 109-117 . 本站查看
5. 邵长庆，杨强，李浩，马学军，王兵虎，宋伟，吕凤兰，边文英. 活动断层作用下地裂缝开裂机理研究. 水文地质工程地质. 2019(04): 34-41 . 本站查看
6. 万佳威，李滨，谭成轩，张鹏，丰成君. 中国地裂缝的发育特征及成因机制研究——以汾渭盆地、河北平原、苏锡常平原为例. 地质论评. 2019(06): 1383-1396 . 百度学术
7. 顾春生，龚绪龙，孙强，卢毅，吕菲菲. 基于光纤传感技术的地裂缝物理模型试验. 水文地质工程地质. 2018(03): 118-123 . 本站查看
其他类型引用(7)
计量
- 文章访问数: 1126
- HTML全文浏览量: 14
- PDF下载量: 583
- 被引次数: 14
下载:
邮件订阅
RSS