overburden stress

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；

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 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

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。

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。