板状破坏的岩体岩爆判别的一种方法

本文探讨锦屏长探洞的各种岩爆现象。在研究构造应力场和重力场及其联合作用对岩爆影响的基础上,指出了对于特深埋洞室,上覆岩层厚度将成为产生岩爆的主要原因。针对现场岩爆的实际破坏形式,提出了边壁破坏的板粱-脆性弹簧模式。研究了破坏面平行于洞室边壁情形下的岩爆机理和判别方法,较好地解释了岩爆发生过程,判别岩爆的临界应力与实际的比较吻合。此外本文还给出一些卸围压试验的结果。

A Method to Determine Rockburst in Rockmass with Plate-form Damage

Various types of rockburst phenomina occurring in the Jinping long testing cavern are discussed in this papes. Based on researching the effects of tectonic stress field and gravity field as well as the effect of their combination on rockbursts, it is pointed out that the thickness of the overburden layers plays the leading role in rockburst for the especially deep cavern. According to the actual damage form in workspot, a new model with plate girder-brittle-distrlbuted springs is given, to study rockburst mechanism and criterion for the case of the damage face parallel to the sidewall of a cavern. The process of the rockburst is better explained, and the critical stress figured out to determine whether rockburst takes place or not is identical with practical one. In addition, some results of tests of confining pressure unloading are put forward.