相关实验视频
Updated: May 12, 2025

07:11
Sampling Soils in a Heterogeneous Research Plot
Published on: January 7, 2019
34.3K
通过土壤和岩石复合基础挖掘引发的土壤沉积的概率分析,考虑到空间变化
Yongjun Zhang1, Zhenfu Zhang1, Sijia Liu2
1School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, China.
Scientific reports
|May 9, 2025
概括
这项研究引入了一个概率框架,以评估土壤和岩石的变化如何影响支式挖掘. 研究结果显示,空间变异性显著影响地面沉积和基础坑的稳定性.
科学领域:
- 地质技术工程 地质技术工程
- 计算力学 计算力学 计算力学
- 风险分析 风险分析
背景情况:
- 地质技术材料沉积导致土壤和岩石特性复杂的空间变化.
- 了解这种变化对于评估土木结构的稳定性和性能至关重要.
- 在复合土壤岩层中进行形挖掘,由于材料特性异质,具有独特的挑战.
研究的目的:
- 开发和应用一个概率框架,以量化评估空间变性的影响,在复合土岩层中加强挖掘.
- 研究关键参数的影响,如波动尺度和模量的变化系数,对地面结算和故障概率的影响.
- 提供关于复杂的土壤岩石环境中地面沉积和稳定的机制的见解.
主要方法:
- 整合拉丁超立方采样,蒙特卡洛模拟和有限差异方法用于概率分析.
- 在复合土岩条件下对地面沉积行为的决定性评估.
- 评估随机场参数 (波动尺度) 和材料性质变化率 (模量的变化系数) 对挖掘性能的影响.
主要成果:
- 确定性分析在复合土岩条件下阐明了地面沉积机制.
- 概率分析显示,空间变化对地面沉积和基础坑的稳定性都有重大影响.
- 波动规模的增加改变了结算值的范围,而变化系数的变化影响了失败概率和结算分布.
结论:
- 地质技术材料的空间可变性是影响式挖掘性能的关键因素.
- 建议的概率框架有效量化了变化对地面结算和稳定性的影响.
- 准确地描述空间变异性对于可靠的设计和复合土壤岩层挖掘的风险评估至关重要.
相关概念视频
Design Example: Maintaining Level of an Embankment
36
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
36
Types of Building Separation Joints
172
Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200...
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200...
172
Unsoundness of Aggregate due to Volume Change
87
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
87
Taping Over Different Ground Profiles
17
Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
17
Shrinkage in Concrete
61
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
61
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
28
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
28

