雙剪雙參數(shù)統(tǒng)一強(qiáng)度準(zhǔn)則改進(jìn)式及其應(yīng)用
( 福州大學(xué) 土木建筑工程學(xué)院，福州 350002)
摘 要: 通過應(yīng)力莫爾圓分析發(fā)現(xiàn)，現(xiàn)有的雙剪雙參數(shù)統(tǒng)一強(qiáng)度準(zhǔn)則在形式上可看成是對具有直線型強(qiáng)度包絡(luò)線的Mohr-Coulomb強(qiáng)度準(zhǔn)則的改進(jìn)，適用于對具有線性強(qiáng)度包絡(luò)線的巖石作力學(xué)分析。對具有拋物線型強(qiáng)度包絡(luò)線的巖石，通過對現(xiàn)有的雙剪雙參數(shù)統(tǒng)一強(qiáng)度準(zhǔn)則作相應(yīng)的非線性化處理，導(dǎo)出了具有該類型強(qiáng)度包絡(luò)線的雙剪雙參數(shù)統(tǒng)一強(qiáng)度準(zhǔn)則改進(jìn)式，改進(jìn)式可用于對承受高壓的硬巖和軟巖作強(qiáng)度分析。另外，還應(yīng)用改進(jìn)式對靜水壓力條件下圓形巷道圍巖作了彈塑性分析。
關(guān)鍵字: 雙剪雙參數(shù)統(tǒng)一強(qiáng)度準(zhǔn)則；拋物線型強(qiáng)度包絡(luò)線；巷道圍巖；彈塑性分析
（ School of Civil Engineering and Architecture,
Fuzhou University, Fuzhou 350002, China）
Abstract: The Mohr circle comparisons show that the two-parameter twin shear unified failure criterion used now has the linear type of the failure envelope as the same as the Mohr-Coulomb strength theory, and it is applicable to the rock with the linear type of the failure envelope. For rock with the parabolic form of the failure envelope, the nonlinear improved expression of the two-parameter twin shear unified failure criterion was given out, and this improved failure criterion could be used to analyze the hard rock bearing high pressure and the soft rock which failure envelopes usually take the form of parabolic. In spite of the above work, the elasto-plastic analysis with this new improved failure criterion is applied to the wall rock around the tunnel with circular cross-section under the static hydraulic pressures.
Key words: two-parameter twin shear unified failure criterion; parabolic failure envelope; wall rock around tunnel; elasto-plastic analysis
