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- Theoretical analysis, simulation experiment and engineering exploration are adopted to study the impact of the location of primary key stratum (PKS) on the evolution range of water flowing fracture. 摘要采用理论分析、模拟实验和工程探测等方法,就覆岩主关键层位置对导水裂隙带高度的影响进行深入研究。
- primary key stratum(PSK) 主关键层
- STUDY ON INFLUENCES OF PRIMARY KEY STRATUM ON SURFACE DYNAMIC SUBSIDENCE 覆岩主关键层对地表下沉动态的影响研究
- A table can have only one primary key. 一个表只能有一个主键。
- Primary key - foreign key relationships. 主键-外键关系。
- Primary key values must be unique. 主键值必须是唯一的。
- The customer ID field is the primary key. 客户ID字段是主键。
- The primary key consists of emp_id and cust_id. 主键包括emp_id和cust_id。
- The primary key value can't be edited in the form. 无法在表单中编辑主键值。
- Add or drop PRIMARY KEY or UNIQUE constraints. 添加或删除PRIMARY KEY或UNIQUE约束。
- Click the row selector for the current primary key. 单击当前主键的行选择器。
- The table does not have a primary key. 该表没有主键。
- Column is the primary key column. 列是主键列。
- Note: The primary key field is numeric by default. 注意:主键字段默认为数值型。
- The idea of key stratum pressure is put forward, and the ground pressure is mainly influenced by the breakage of key . 提出主关键层来压的新概念,指出回采工作面矿压显现程度主要受主关键层破断的影响。
- The caving of thick and strong roof stratum,key stratum,causes tremendous rock pressure in mine. 采场上覆岩层中的厚硬岩层,即厚硬关键层,其冒落会造成剧烈的矿山压力显现。
- According to the model,applying the cusp catastrophic theory the mechanics mechanism of water inrush is analyzed from key stratum of floor. 当满足关键层失稳的充要力学条件时,承压水底板有可能发生失稳突水。
- Satisfying the sufficient mechanics condition for key stratum instability, a water inrush is likely to happen in the floor. 当满足关键层失稳的充要力学条件时,承压水底板有可能发生失稳突水。
- Based on the structural characteristics of floor in the longwall face, the structural model of the key stratum (KS) in floor is established. 根据采场底板岩体结构特征,建立了底板岩体的关键层(KS)结构模型。
- Primary keys do not allow null values. 主键不允许空值。