位于拟建机场中部北侧试验段的张家沟–桥子沟滑坡治理工程在施工过程中引发了边坡滑坡及后缘变形。滑坡于2021年12月23日发生,形态呈“舌状”,为中型、浅层、土质、牵引式滑坡,滑动方向约295˚。滑坡区与后部牵引变形区,由工程活动引发...位于拟建机场中部北侧试验段的张家沟–桥子沟滑坡治理工程在施工过程中引发了边坡滑坡及后缘变形。滑坡于2021年12月23日发生,形态呈“舌状”,为中型、浅层、土质、牵引式滑坡,滑动方向约295˚。滑坡区与后部牵引变形区,由工程活动引发的边坡失稳和变形明显。通过对滑坡区和牵引变形区的工程地质调查,发现滑坡的主要成因是边坡分级放坡、强夯置换等施工活动破坏了原边坡的稳定性,使得滑坡体在自身重力作用下产生滑动,并牵引后缘边坡变形,同时也触发了2#老滑坡东南角的局部复活。通过综合评估滑坡的形态特征、边界条件及稳定性,本文提出施工过程中应加强对边坡变形的监测,合理安排施工工序,避免过度扰动边坡,限制施工活动对边坡稳定性的影响。同时,对于已发生滑动的边坡,应采取及时的工程治理措施,如增设支挡结构、稳定后缘陡坎等,以确保治理工程的顺利进行和周边环境的安全。此项研究旨在为类似黄土高边坡的施工安全提供借鉴,强调在施工过程中应充分考虑地质条件,科学规划,有效防止滑坡的发生。Located in the test section on the north side in the middle of the proposed airport, the landslide control project of Zhangjiagou-Qiaozigou in the construction process of the project has triggered slope landslides and rear edge deformations. The landslide occurred on December 23, 2021, with a shape like a “tongue”, being a medium-sized, shallow, soil-based, and traction-type landslide, with a sliding direction of approximately 295˚. The landslide area and the rear traction deformation area have obvious slope instability and deformations triggered by engineering activities. Through the engineering geological investigation of the landslide area and the traction deformation area, it was found that the main cause of the landslide is that the construction activities such as slope grading and cut slope, and dynamic compaction and replacement have damaged the stability of the original slope, causing the landslide body to slide under its own gravity and pulling the rear edge slope to deform, and also triggering the local revival of the southeast corner of the No. 2 old landslide. Through a comprehensive assessment of the morphological characteristics, boundary conditions, and stability of the landslide, this paper proposes that during the construction process, it is necessary to strengthen the monitoring of slope deformations, rationally arrange the construction process, avoid excessive disturbance of the slope, and limit the impact of construction activities on the stability of the slope. At the same time, for the slope where sliding has occurred, timely engineering control measures should be taken, such as adding additional support structures and stabilizing the rear edge steep slope, to ensure the smooth progress of the control project and the safety of the surrounding environment. This study aims to provide reference for the construction safety of similar loess high slopes, emphasizing that in the construction process, the geological conditions should be fully considered, scientifically planned, and the occurrence of landslides should be effectively prevented.展开更多
An optimal drainage tunnel location determination method for landslide prevention was proposed to solve the existing problems in drainage tunnel construction. Current applications of drainage tunnel systems in China w...An optimal drainage tunnel location determination method for landslide prevention was proposed to solve the existing problems in drainage tunnel construction. Current applications of drainage tunnel systems in China were reviewed and the fimctions of drainage tunnel were categorized as catchment and interception. Numerical simulations were conducted. The results show that both catchment and interception tunnels have variation of the function in the simulation of monolayer model, which shows the reduction of permeability condition in lower layer. The function of catchment can be observed in the deep slope, while the function of interception is observed near groundwater source. By using the slope safety factor and discharge water amount as the objectives of optimal drainage tunnel location, and pore-water pressure in fixed node and section flux as the judgment for construction quality of adjacent drainage tunnel, the design principle of drainage tunnel was introduced. The K103 Landslide was illustrated as an example to determine the optimal drainage tunnel location. The measured drainage tunnel efficiency was evaluated and compared with that from the numerical analyses based on groundwater data. The results validate the present numerical study.展开更多
文摘位于拟建机场中部北侧试验段的张家沟–桥子沟滑坡治理工程在施工过程中引发了边坡滑坡及后缘变形。滑坡于2021年12月23日发生,形态呈“舌状”,为中型、浅层、土质、牵引式滑坡,滑动方向约295˚。滑坡区与后部牵引变形区,由工程活动引发的边坡失稳和变形明显。通过对滑坡区和牵引变形区的工程地质调查,发现滑坡的主要成因是边坡分级放坡、强夯置换等施工活动破坏了原边坡的稳定性,使得滑坡体在自身重力作用下产生滑动,并牵引后缘边坡变形,同时也触发了2#老滑坡东南角的局部复活。通过综合评估滑坡的形态特征、边界条件及稳定性,本文提出施工过程中应加强对边坡变形的监测,合理安排施工工序,避免过度扰动边坡,限制施工活动对边坡稳定性的影响。同时,对于已发生滑动的边坡,应采取及时的工程治理措施,如增设支挡结构、稳定后缘陡坎等,以确保治理工程的顺利进行和周边环境的安全。此项研究旨在为类似黄土高边坡的施工安全提供借鉴,强调在施工过程中应充分考虑地质条件,科学规划,有效防止滑坡的发生。Located in the test section on the north side in the middle of the proposed airport, the landslide control project of Zhangjiagou-Qiaozigou in the construction process of the project has triggered slope landslides and rear edge deformations. The landslide occurred on December 23, 2021, with a shape like a “tongue”, being a medium-sized, shallow, soil-based, and traction-type landslide, with a sliding direction of approximately 295˚. The landslide area and the rear traction deformation area have obvious slope instability and deformations triggered by engineering activities. Through the engineering geological investigation of the landslide area and the traction deformation area, it was found that the main cause of the landslide is that the construction activities such as slope grading and cut slope, and dynamic compaction and replacement have damaged the stability of the original slope, causing the landslide body to slide under its own gravity and pulling the rear edge slope to deform, and also triggering the local revival of the southeast corner of the No. 2 old landslide. Through a comprehensive assessment of the morphological characteristics, boundary conditions, and stability of the landslide, this paper proposes that during the construction process, it is necessary to strengthen the monitoring of slope deformations, rationally arrange the construction process, avoid excessive disturbance of the slope, and limit the impact of construction activities on the stability of the slope. At the same time, for the slope where sliding has occurred, timely engineering control measures should be taken, such as adding additional support structures and stabilizing the rear edge steep slope, to ensure the smooth progress of the control project and the safety of the surrounding environment. This study aims to provide reference for the construction safety of similar loess high slopes, emphasizing that in the construction process, the geological conditions should be fully considered, scientifically planned, and the occurrence of landslides should be effectively prevented.
基金Foundation item： Project（1220BAK10B06） supported by the National ＂Twelfth Five-Year＂ Plan for Science ＆ Technology Support Program of China Project（20100101110026） supported by the PhD Programs Foundation of Ministry of Education of China Project（2009RS0050） supported by the Key Innovation Team Support Fund of Zhejiang Province, China
文摘An optimal drainage tunnel location determination method for landslide prevention was proposed to solve the existing problems in drainage tunnel construction. Current applications of drainage tunnel systems in China were reviewed and the fimctions of drainage tunnel were categorized as catchment and interception. Numerical simulations were conducted. The results show that both catchment and interception tunnels have variation of the function in the simulation of monolayer model, which shows the reduction of permeability condition in lower layer. The function of catchment can be observed in the deep slope, while the function of interception is observed near groundwater source. By using the slope safety factor and discharge water amount as the objectives of optimal drainage tunnel location, and pore-water pressure in fixed node and section flux as the judgment for construction quality of adjacent drainage tunnel, the design principle of drainage tunnel was introduced. The K103 Landslide was illustrated as an example to determine the optimal drainage tunnel location. The measured drainage tunnel efficiency was evaluated and compared with that from the numerical analyses based on groundwater data. The results validate the present numerical study.
