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岩体初始应力场是一个十分复杂的问题,而应力实测又不是任何条件下都可以实现的。因此正确估算初始应力场对围岩稳定性分析就变得十分重要。本文试图根据国内外有关资料和个人实验及实测结果,对煤系地层的原岩应力场进行探讨,就目前有争议的某些问题提出了一些个人的看法。文中对煤系地层岩石的性质,特别是流度性质进行了阐述,对原岩应力场中各应力分量之间的关系进行了详细讨论,认为静水压力假说可以作为煤系地层原岩应力的计算基础。文中也讨论了构造应力场的影响,区分了自重应力场和构造应力场各自在原岩应力场中所起的作用。建立了一套简单易行的原岩应力场的估算方法,并在实际应用中得到了证实。
The initial stress field of rock mass is a very complicated problem, but the stress measurement can not be realized under any conditions. Therefore, it is very important to correctly evaluate the initial stress field to analyze the stability of surrounding rock. This paper tries to discuss the original rock stress field of the coal measure strata according to the domestic and international relevant data, personal experiments and the measured results, and puts forward some personal opinions on some controversial issues at present. In this paper, the properties of the stratigraphic rocks in coal measures, especially the fluidity properties, are expounded. The relationships between stress components in the stress field of the original rock are discussed in detail. The hypothesis of hydrostatic pressure can be used as the calculation of the original rock stress of the coal measures strata basis. The paper also discusses the effect of tectonic stress field and distinguishes the role of self-weight stress field and tectonic stress field in the stress field of the original rock. A set of simple and easy method of estimating the original rock stress field was established and proved in practice.