Mechanical Properties and Deformation and Failure Characteristics of Surrounding Rocks of Tunnels Excavated in Soft Rocks

被引：6

作者：

Han L. ^{[1
]}

Zuo Y. ^{[1
]}

Guo Z. ^{[1
]}

Zhang L. ^{[1
]}

Chen X. ^{[2
]}

Mao J. ^{[3
]}

机构：

[1] Zhangjiakou Vocational and Technical College, Zhangjiakou, 075000, Hebei

[2] Zhangjiakou Zhangyuan Project Management Co., Ltd, Zhangjiakou, 075000, Hebei

[3] Shijiazhuang City Rail Transit Limited Liability Company, Shijiazhuang, 050043, Hebei

来源：

Geotechnical and Geological Engineering | 2017年 / 35卷 / 06期

关键词：

Deformation characteristic; Failure characteristic; Mechanical test; Soft rock; Tunnel;

D O I：

10.1007/s10706-017-0278-9

中图分类号：

TD [矿业工程];

学科分类号：

0819 ;

摘要：

As soft rocks are likely to soften, slime and swell while contacting water, the existence of soft rocks is harmful for stability of surrounding rocks and supporting structures of tunnels. Through uniaxial and triaxial tests under dry condition and triaxial test with different moisture contents, the mechanical properties and failure modes of soft rocks were studied under conditions that the schistosity plane of the rock samples was vertical to, presented an oblique angle with, and paralleled to the loading direction. The results showed that peak strengths in natural and water-bearing states increased with increasing confining pressures, while those in water-bearing state were 40% lower than those in natural state. The samples were mainly subjected to ductile failure in both natural and water-bearing states while the samples in natural state exhibited a certain brittle failure characteristic in post-peak phase. With the increase of confining pressures, the post-peak curve gradually became gentle after certain brittle failure while the post-peak stresses had an insignificant change. In comparison, the samples in water-bearing state showed significant post-peak disparity, that is, exhibited strong ductile failure characteristic. Moreover, the fitting relationship between triaxial compressive strength and moisture of soft rocks can be expresses as σ1 = Aω + B (A < 0, B > 0) while that between elasticity modulus and moisture can be expresses as E = Aω + B (A < 0, B > 0). © 2017, Springer International Publishing AG.

引用

页码：2789 / 2801

页数：12

共 15 条

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