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采用多触点预压式元件的钻孔变形法地应力测量,能够测得孔壁上较多点的折算位移值,因而能够用平差术减少偶然误差,得出地应力大小和方向的最佳值。本文讨论了这种元件在绝对应力测量和相对应力测量过程中的力学作用,导出了孔壁接触点折算位移向量与元件输出向量之间的基本关系式,以及它们增量之间的关系式。本文是文献[2]工作的推广。当接触点相互之间的距离变大、接触压力的相互影响减弱时,从本文基本关系式得出的极限情形与文献[2]的一致。本文比文献[2]进一步明确了目前实际工作中所用公式的简化前提。文末指出了用多触点元件精确测定地应力尚待解决的一些问题。
Using multi-contact pre-compression element of the drilling deformation method of stress measurement can measure the displacement of more points on the hole wall displacement, which can be used to reduce the accidental error adjustment to reach the maximum value of stress and direction Good value. In this paper, the mechanical action of this kind of element in absolute stress measurement and relative stress measurement is discussed. The basic relation between the displacement vector and the element output vector of the contact point of the hole wall is derived and the relationship between them is also derived. This article is the literature [2] promotion of the work. When the distance between contact points becomes larger and the interaction between contact pressure weakens, the limit case derived from the basic relation of this paper is consistent with [2]. This paper further clarifies the simplified premise of the formula used in the actual work than the literature [2]. At the end of the article, some problems that need to be solved to determine the in-situ stress accurately with multi-contact elements are pointed out.