硐室开挖过程中考虑应变软化性质的合理性分析

Analysis of Rationality of Considering the Characteristic of Strain Softening in Construction of Chamber

地下硐室施工过程中,岩体应变软化性质会对其开挖及支护产生一系列影响。为保证施工过程中硐室围岩的安全和稳定,本文给出了考虑岩体应变软化性质的围岩各区应力、位移分布规律及围岩压力与硐周位移关系的弹塑性理论解。通过简单算例将此理论解答与围岩的实际工程特性及传统芬纳解进行分析对比,验证了考虑岩石应变软化性质的合理性。

The strain softening property of rock masses brings about a series of problem in the construction of underground chamber. To guarantee the safety and stability of the chamber,we give out the theoretical answer of distribution of stress and displacement in surrounding rock masses and the relationship between surrounding rock pressure and surrounding rock displacement. Finally,we compared the theoretical answer with the practical engineering characteristics of surrounding rock and traditional Fenner solution using a simple example,through the analysis of the comparison we confirmed the rationality of considering the characteristic of strain softening in construction of underground chamber.