相关实验视频
Updated: May 22, 2025

08:20
In Situ Soil Moisture Sensors in Undisturbed Soils
Published on: November 18, 2022
6.0K
通过-梁-门方法对车站地下挖掘的机械机制和控制优化进行研究
Nan Liu1,2, Xiao Tong3,4, Yusheng Jiang2
1School of Civil Engineering, Hebei University of Engineering, Handan, 056000, Hebei, China.
Scientific reports
|March 14, 2025
概括
试点道挖掘和二次层施工显著影响地下站变形. 优化挖掘序列和深度可以最大限度地减少表面沉积和结构压力,从而实现更安全的地铁建设.
科学领域:
- 地质技术工程 地质技术工程
- 土木工程 土木工程是指土木工程.
- 道和地下建筑工程
背景情况:
- 地下地铁站的建设,特别是Pile-Beam-Arch (PBA) 类型的地铁站,带来了与层层和结构变形有关的重大挑战.
- 北京地铁12号线上的北台平庄站是分析这些复杂的地下建筑过程的案例研究.
研究的目的:
- 调查PBA站建设过程中表面和结构变形的主要原因.
- 分析关键建筑参数对应力和变形特征的影响.
- 确定一个最佳的建筑方案,以尽量减少变形并确保结构稳定性.
主要方法:
- 使用有限元软件进行三维数值建模,模拟整个车站建设过程.
- 参数研究评估了试点道分阶段距离,二次层序列,下层土壤挖掘序列和挖掘深度的影响.
- 多标准优化,以获得最佳的建设策略.
主要成果:
- 试点道挖掘和二次线扣弧建筑被确定为导致表面变形的主要原因.
- 二次线扣弧结构是中间柱和侧柱的变形的主要驱动因素.
- 最佳的试点道分层距离 (直径的1.5-3倍) 显著影响了表面沉积.
- 对于二次层和下层土壤挖掘的特定序列,以及受控的挖掘深度,最大限度地减少了层层和结构变形.
结论:
- 该研究提供了关于在地下PBA站建设过程中控制变形的关键见解.
- 优化施工参数,包括挖掘顺序和深度控制,对于降低风险至关重要.
- 经过验证的数值模型和推导的最佳方案为类似的地下工程项目提供了宝贵的指导.
相关概念视频
Method of Superposition
613
The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
When applying the method of superposition, each type of load—whether...
613
Indeterminate Structure
487
Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium. Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
487
Pumped Concrete
57
Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
57
Quarrying of Stone
82
Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
82
Prismatic Beams: Problem Solving
100
In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
100
Design of Prismatic Beams for Bending
193
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
193

