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(1 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055； 2 青島理工大學(xué)理學(xué)院，青島 266033)

［摘要］基于巖體應(yīng)變非線性軟化本構(gòu)模型，考慮中間主應(yīng)力的影響，對(duì)等壓荷載作用下的襯砌壓力隧洞進(jìn)行彈塑性分析。將圍巖劃分為裂縫區(qū)、塑性區(qū)、彈性區(qū)，推導(dǎo)出了圍巖裂縫區(qū)、塑性區(qū)、彈性區(qū)及襯砌內(nèi)任一點(diǎn)的應(yīng)力和位移解析計(jì)算公式，并得到了使襯砌邊緣巖體開始產(chǎn)生塑性變形的臨界內(nèi)壓力。所得到的解與基于理想彈塑性體的Kaster′s解相比，更接近實(shí)際隧洞圍巖受力變形情況。

［關(guān)鍵詞］應(yīng)變非線性軟化；襯砌壓力隧洞；圍巖；彈塑性分析

Elastic-plastic analysis of pressure tunnel with liner based on strain nonlinear softening rock model

Zhang Liming 1,2, Wang Zaiquan 2, Yin Ying 2, Lu Zeyang 2

(1 Department of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China；2 College of Science, Qingdao Technological University, Qingdao 266033, China)

Abstract:According to the strain nonlinear softening constitutive model of practical rock, pressure tunnel with liner under the uniform pressure is analyzed. Different displacement and stress distribution laws of the plastic residual zone, plastic zone, elastic zone and liner are presented. All obtained results are more closely approach to actual values of surrounding rocks, comparing with Kastner′s solution. The critical pressure leading to yield firstly that caused by inner pressure is introduced.

Keywords:strain nonlinear softening; pressure tunnel with liner; surrounding rock; elastic-plastic analysis

*山東省教育廳資助項(xiàng)目（J07YB01）；山東省自然科學(xué)基金資助項(xiàng)目（Y2005A03）。