层状盐岩溶腔建造过程中石膏夹层周期性垮塌理论分析

doi:10.13722/j.cnki.jrme.2014.0522

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摘要层状盐岩溶腔建造过程中，随着溶腔的扩大，悬露的石膏夹层会发生周期性垮塌，这样就会砸弯砸坏管道影响造腔的速度和溶腔的形状。同时石膏夹层在不同温度不同卤水浓度浸泡下，会有不同程度的强度弱化。本文以石膏夹层的周期垮塌为研究对象，通过建立圆环薄板力学模型，分析圆环薄板的非压曲和压曲破坏。同时提出夹层的周期垮塌步距，并给出一种判断石膏夹层发生非压曲破坏和压曲破坏的计算流程。通过对某工程实例进行理论分析和数值模拟计算，结果表明：随着盐岩溶腔的扩大，石膏夹层周期垮塌步距逐渐减小；卤水浓度、温度对石膏夹层的周期垮塌次数影响较大。常温未浸泡石膏夹层的垮塌步距由12.00 m逐渐降低到8.50 m，周期垮塌3次。70 ℃饱和卤水浸泡后的石膏夹层垮塌步距由4.05 m逐渐降低到1.98 m，周期垮塌7次；卤水温度越高，浓度越大，周期垮塌步距越小同时垮塌次数就会越多。

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关键词 ：岩石力学, 盐岩, 夹层垮塌, 圆环薄板, 周期垮塌步距

Abstract：During construction of bedded salt cavern，the handing interlayer collapses periodically as the size of salt cavern expands. Meanwhile，gypsum interlayer has varying degree of weakening when soaked in brine with different temperature and different concentration. It can cause the pipeline to break and fracture. Moreover it has a dramatic impact on the shape and speed of construction of salt cavern. The problem is the research background of mechanism of interlayer's collapse. Based on the theory of annular plate, a mechanical model for the analysis of the gypsum interlayer's collapse is established. Besides, the non-bucking failure and bucking failure of annular plate are analyzed in this paper. Finally, the concept of periodic caving pace and the flowchart of calculating is proposed. The flowchart is applied to measure to the failure characteristics of gypsum interlayer. Through the theory and simulation analysis and example demonstration，it was showed that the periodic caving pace decrease gradually with the increasing area of salt cavern. Periodic caving times was affected by temperature and concentration of brine. The caving pace of gypsum interlayer which not be soaked in brine was reduced to 8.50 m from 12.00 m and collapsed three times. However, the caving pace of gypsum interlayer which be soaked in hot brine (70 ℃) was reduced to 1.98 m from 4.05 m and collapsed seven times. Periodic caving times increased with the increase of temperature and concentration of brine.

Key words： rock mechanics salt rock interlayer collapse annular plate periodic caving pace

引用本文:

孟涛，梁卫国，陈跃都，于永军. 层状盐岩溶腔建造过程中石膏夹层周期性垮塌理论分析[J]. 岩石力学与工程学报, 2015, 34(s1): 3267-3273.
MENG Tao，LIANG Weiguo，CHEN Yuedu，YU Yongjun. THEORETICAL ANALYSIS OF PERIODIC FRACTURE FOR GYPSUM INTERLAYER DURING CONSTRUCTION OF BEDDED SALT CAVERN. , 2015, 34(s1): 3267-3273.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0522 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3267

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