Cognition of geological problems of thick overburden layer

The collapse of overburden layer and land surface due to underground mining is one kind of environmental hazards induced by human being.

采矿区覆岩及地表塌陷是涉及全球性人为环境灾害之一。

Secondly, results of experiments, using the bentonite and seal flexible water bag as the overburden layer, are compared.

其次，对膨润土、柔性水袋两种覆盖层模拟材料进行了对比试验研究。

The wave number, buried depth of the structure underground and the parameters of surface overburden layer all can change the surface displacement obviously.

入射波的波数、地下结构的埋深和覆盖层的参数使地表位移发生较大的改变。

Application of Comprehensive Geophysical Method to Deep Overburden Layer Exploration in River Bed

综合物探方法在河床深厚覆盖层勘探中的应用

Calculate the overburden pressure by density logging;

利用密度测井方法计算出上覆岩层压力；

The low-permeability cores show stress sensitivity during the effective overburden pressure increasing.

低渗储层岩心在有效上覆压力增大的过程中会表现出较强的应力敏感性。

Large area field immersion tests on characteristics of deformation of self weight collapse loess under overburden pressure

大厚度自重湿陷性黄土场地湿陷变形特征的大型现场浸水试验研究

Overburden pressure has a strong influence on permeability and pore structure.

上覆地层压力对渗透率及孔隙结构特征影响很大。

Determination and Regression of Overburden Pressure Gradient

上覆岩层压力梯度合理计算及拟合方法

The oil shale on the surface show opening foliation, abundant pore volume and low density because of less overburden pressure.

地表油页岩由于覆压减小等影响，页理张开、孔隙增加、密度减小。

The research shows that the relationship between formation porosity, permeability and net overburden pressure is closely related to univariate quadratic equation;

结果表明：油层孔隙度、渗透率与净覆压的关系以一元二次方程最为密切；

Of the pressures, the one caused by the weight of overlying sediments, we call it overburden pressure, is the most obvious.

在这两种压力之中，由上覆沉积物重量造成的压力最为明显，我们称这种压力为上覆压力。

The research and application of permeability, porosity and net overburden pressure laws

孔隙度、渗透率与净覆压的规律研究和应用

Investigation on characteristics of physical parameters under formation overburden pressure

地层上覆压力下物性参数特征研究

The line density and area density have been counted. Overburden stress is calculated using the density logging data.

区的密度。根据岩石密度测井资料计算了各个深度上静负载应力。

Research on Similarity Simulation Experiment of Development Law of Mining-induced Overburden Stress Overburden stress is calculated using the density logging data.

采动覆岩应力发展规律的相似模拟实验研究根据岩石密度测井资料计算了各个深度上静负载应力。

This conclusion is also helpful for explaining the question that casing collapse load maybe larger than the overburden stress some times.

同时这也有助于解释套管所受外挤载荷超过上覆岩层压力的问题。

The overburden stress in sediments capillary will gradually breed because of continuously hydrate formation in the course of gas migration, and will cause faults or fractures of the stratum matrix.

气体在迁移中不断形成水合物并在孔隙中形成过压，导致地层骨架的力学破裂和失稳；

Research on Similarity Simulation Experiment of Development Law of Mining-induced Overburden Stress

采动覆岩应力发展规律的相似模拟实验研究

The results show that vertical stress is equal to overburden stress at shallow level. Maximum principal stress is sub horizontal stress in the NE direction.

结果表明：显德汪煤矿垂直应力近似等于上覆岩层的自重应力，最大主应力为北东方向，且为近水平压应力。