Non-linear, stress- and strain-dependent behavior of soft rocks under cyclic triaxial conditions

Yoshinaka, Ryo; Tran, Thi-Bao-Tien; Osada, Masahiko

doi:10.1016/s0148-9062(98)00158-2

Cited by 38 publications

(17 citation statements)

References 9 publications

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“…e time effect of rock fragmentation is summarized by Tang [6]. Yoshinaka et al and Anagnostou pointed out that the failure deformation of soft and fractured surrounding rock has rheological properties [7][8][9][10][11]. Joseph proposed the relationship between residual strength and peak strength of cracked rock [12].…”

Section: Introductionmentioning

confidence: 99%

Supporting Technology Research in Deep Well Based on Modified Terzaghi Formula

Peng

Wang

Che

2018

Advances in Civil Engineering

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In order to solve the difficult problem of supporting roadway with large cross section and broken surrounding rock, the largesection inclined shaft of Pingdingshan Coal Mine is taken as the research instance. In this paper, a modified formula for the Terzaghi ultimate bearing capacity of a foundation is established based on rock mass strength criteria. As per the engineering practice, the maximum roof pressure of the inclined shaft is calculated to be 2.7 MPa, and the minimum pressure value from the modified formula is only 0.3 MPa. In order to control the floor heave of the roadway, a U-type steel inverted arch and bolts support scheme was designed. After calculating through the mechanical model of the inverted arch, its bearing capacity is 0.56 Mpa.rough comparison and analysis of various supporting schemes, finally, the "U-type steel + inverted arch + pouring concrete + backwall grouting" technology is selected, and the engineering practice shows that the supporting scheme can effectively improve surrounding rock stability.

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Section: Introductionmentioning

confidence: 99%

Supporting Technology Research in Deep Well Based on Modified Terzaghi Formula

Peng

Wang

Che

2018

Advances in Civil Engineering

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“…The mechanics and physicochemical condition of roadway surrounding rock are changed in the soft rock, the sliding and breaking of conventional pretension bolts in surrounding rock bring a dilemma to the control of soft rock roadway [3,4]. Though the conventional pretension bolt can provide certain support resistance to surrounding rock, the deformation capacity is insufficient to adapt the expansion of soft rock [5][6][7]. Thus, the deformation capacity of bolt should be considered in soft rock engineering.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Guo¹,

Zhang

Wang

et al. 2018

Teh. vjesn.

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The effect of conventional bolt support is not ideal due to the large deformation character of soft rock. As an innovative bolt, constant resistance large deformation (CRLD) bolt has been successfully applied to swelling soft rock engineering, but the reinforcement mechanism is not yet clear. To investigate the interaction mechanism between bolt and surrounding rock, Nanshan Coal Mine of China was selected as the engineering background. The plastic zone of surrounding rock mass and the axial force of three bolts were obtained by theoretical analysis and FLAC3D numerical simulation. Failure processes of conventional pretension bolts in soft rock were reproduced, and the interaction between CRLD bolt and soft rock was investigated in comparison. The results indicate that: (1) The fracture zone of surrounding rock exceeds the anchorage range of the low pretension bolt, the bolt slides with surrounding rock and finally fails.(2) The fracture zone of surrounding rock does not exceed the anchorage range of the high pretension bolt. However, with the accumulation of deformation energy, stress concentration makes the bolt break. (3) CRLD bolt can effectively absorb the deformation energy released by soft rock and maintain constant support resistance. The conclusions obtained in this study provide significant references in the selection of bolts in soft rock engineering.

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“…However, the effectiveness and applicability of rock bolt system for the reinforcement of soft rock masses has not yet been established (Jiao et al, 2013;Wang et al, 2000;Yoshinaka et al, 1998). Soft rock refers to a group of geotechnical materials that has a uniaxial compressive strength between 0.5 and 25 MPa and has similar geotechnical characteristics, including slaking, swelling, compressibility, time dependence, and volume change (Jiao et al, 2013;Wang et al, 2000;Yoshinaka et al, 1998). Roadways caved out of soft rocks exhibit large deformation in the form of severe roof sag, wall convexity, and floor heave.…”

Section: Introductionmentioning

confidence: 99%