含层间剪切带的层状复合岩体质量分级

doi:10.13722/j.cnki.jrme.2016.0690

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Abstract

As a special weak structural plane，interlayer shear zone often forms the control factor which threatens the stability of engineering rock mass. The preliminary cognition and existing problems of main quality classification methods of rock mass about interlayer shear zones are analyzed. Based on the viewpoints of control by rock mass structure and consideration of layered rock mass structure types，according to the size characteristics of interlayer shear zones and their impact mechanism on the stability of stratified composite rock mass，the quality classification and evaluation methods of stratified composite rock mass with interlayer shear zones are established. (1) The interlayer shear zones with good continuity and bigger dimension，whose thickness is more than 10 cm，are set as independent weak interlayer structure of shear dislocation. For this circumstance，the quality classification and evaluation of stratified composite rock mass with interlayer shear zones are carried out separately，according to the shear strength parameters of interlayer shear zones. (2) The interlayer shear zones with smaller dimension，especially the siltized interlayers whose thickness is less than 10 cm，are regarded as the reduction factors. The modified BQ method of quality classification of stratified composite rock mass with interlayer shear zones is founded by weakening treatments. The quality classification results of surrounding rock mass at two exploration adits with obvious interlayer shear zones in the dam site are obtained by the modified BQ method，taking some large-scale water control project in the Middle Yellow River. By comparison and relevant analysis with RMR，Q，and HC methods，the validity of the modified method of stratified composite rock mass quality classification with interlayer shear zones is verified.

Key words： rock mechanics interlayer shear zone stratified composite rock mass rock mass structure types modified coefficient quality classification

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	Articles by authors
	YAN Changbin1
	WU Weigong2
	WANG Guijun2

Cite this article:

YAN Changbin1,WU Weigong2,WANG Guijun2. Quality classification of stratified composite rock mass with interlayer shear zones[J]. , 2018, 37(S1): 3449-3457.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0690 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3449

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