在华南煤矿区的石崩塌柱的特征和演变
Tingting Yang1, Guangquan Xu1, Kai Chen1
1School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, PR China.
The Science of the total environment
|July 28, 2023
概括
石灰岩崩塌柱 (KCC) 构成采矿风险. 本研究对华南煤田的KCC开发阶段和进化过程进行了分类,为矿山水危害预防提供了见解.
科学领域:
- 地质和采矿工程地质学和采矿工程
- 水地质学和卡斯特科学
背景情况:
- 石灰岩崩塌柱 (KCC) 对深层煤层采矿作业构成重大安全风险.
- 了解KCC的发展阶段和进化过程对于减轻相关的采矿风险至关重要.
研究的目的:
- 系统地分析和分类华南煤矿区中KCC的发展阶段和进化过程.
- 通过整合各种地质和水文地质数据,建立KCC发展的进化模型.
- 为防止和控制与KCC相关的矿井水危险提供一个框架.
主要方法:
- 对钻井层数据,区域地下水流量,含水层水地化学和水力动力学参数的分析.
- 基于其形态,内部结构,透性和特异性排放的KCC的分类.
- 开发KCC进化模型并将其分为三个不同的阶段:增长,衰退和死亡.
主要成果:
- 在不同的矿场中确定了不同的KCC特征,从高度填充和低透度到高度破碎和高透度.
- 量化透系数 (0.2-0.5 m/d) 和特异性排放 (0.1-0.2 L/s•m) 对于Xieqiao和Zhangji矿山中的KCC.
- 在古北矿区的KCC具有高透率 (>1.5L/s•m) 和随深度而增加的下水强度.
结论:
- 根据水文地质特征为KCC发展建立了一个三阶段分类 (增长,衰退,死亡).
- 开发了KCC的进化过程模型,整合了沉积物学,岩石学和水文地质学理论.
- 这项研究为KCC阶段提供了一种新的分类方法,并为了解中国北部的水冲入机制提供了宝贵的参考.
相关概念视频
Carbonation Shrinkage
166
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
166
Euler's Formula for Pin-Ended Columns
345
In structural engineering, the stability of columns under compressive axial loads is a critical consideration, described as buckling. A typical example involves a column PQ, which is pin-connected at both ends and subjected to a centric axial load F applied at one end, with a reaction force of F' = -F at the other end. Here, it is crucial to understand that when an applied load exceeds the critical load, buckling occurs as the system becomes unstable.
To calculate the critical load,...
To calculate the critical load,...
345
Design of Columns under a Centric Load
144
The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
144
Euler's Formula to Columns with Other End Conditions
557
Euler's formula is very important in the field of structural engineering, providing a foundation for understanding the critical loading conditions of pin-ended columns. This formula links the modulus of elasticity, the moment of inertia of the cross-section, and the column's length, offering a precise calculation of the critical load at which a column is prone to buckling.
557
Behavior of Concrete Under Compressive Load
212
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
212
Design of Columns under an Eccentric Load
590
Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
590


