高温变温环境下喷射混凝土–岩石界面剪切特性及温度损伤模型研究

doi:10.13722/j.cnki.jrme.2018.0852

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Abstract Shotcrete structures of geothermal tunnels are molded by hydration action under variable high temperatures and play a supporting role. Based on environment parameters in the tunnel and temperatures of the initial support，shear tests of concrete-rock interfaces were carried out. According to the experimental results，the temperature change period of the initial support concrete was ascertained. The shear failure mode, the interface peak shear strength and the displacement were analyzed under different temperatures，and a concrete interface shear constitutive model of concrete-rock interfaces considering temperature damage effect was proposed. The results show that the temperature of the initial shotcrete declines to the environment temperature in the tunnel within 5–7 days. With the increase of the initial curing temperature，the shear curve shows elasticity before the peak，and compaction hardening and elastic softening after the peak. The peak shear stress is a negative growth function of the curing temperature，but the peak shear displacement has a positive relationship with the curing temperature. The normal stress has a weakening effect on the temperature damage characteristics. Based on the indoor shear test results，a rock-concrete interface shear constitutive model considering temperature damage and normal stress correction was established. Comparisons between the theory curves and the experimental curves were performed and a good agreement was observed. The constitutive model can be applied to the analysis of the shear-mechanical properties of the concrete-rock interfaces with different degrees of high-temperature damage and can provide some support for the design and analysis of tunnels and underground engineering affected by high temperatures.

Key words： tunnelling engineering change of temperature shear failure mode thermal damage model shear strength

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	Articles by authors
	WANG Mingnian1
	2
	HU Yunpeng1
	2
	TONG Jianjun1
	2
	WANG Qiling1
	2
	WANG Yicheng1
	2
	DONG Congyu1
	2

Cite this article:

WANG Mingnian1,2,HU Yunpeng1, et al. Experimental study on shear mechanical properties and thermal damage model of shotcrete-rock interfaces under variable high temperatures[J]. , 2019, 38(1): 63-75.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0852 OR http://www.rockmech.org/EN/Y2019/V38/I1/63

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