考慮非極限狀態(tài)土壓力的水泥土攪拌樁圍護結(jié)構(gòu)水平變形計算方法*
韓業(yè)龍1，2，鄭剛1，2，刁鈺1，2，聶東清1，2
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(1 天津大學(xué)建筑工程學(xué)院，天津 300072；2 濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室，天津 300072)[摘要] 目前工程設(shè)計中計算土壓力時一般采用朗肯或庫侖土壓力理論，這兩種理論屬于極限狀態(tài)理論，而土體在實際工作狀態(tài)下位移很小，土壓力往往不能達到主動或被動極限狀態(tài)，即一般處于非極限狀態(tài)。根據(jù)基坑支護變形特征，選取似指數(shù)函數(shù)計算土壓力，可考慮土壓力與支護位移之間的關(guān)系；進而，基于能量法，建立了考慮非極限狀態(tài)土壓力的水泥土攪拌樁圍護結(jié)構(gòu)水平變形的計算方法；最后將計算結(jié)果與工程案例實測進行了對比驗證。分析結(jié)果表明，考慮非極限狀態(tài)土壓力的計算方法具有較好的準確度。[關(guān)鍵詞] 土壓力; 非極限狀態(tài); 能量法; 圍護結(jié)構(gòu); 水平變形中圖分類號：TU470.3 文獻標識碼： 文章編號：*國家重點基礎(chǔ)研究發(fā)展計劃（973計劃）項目（2010CB732106），國家科技支撐計劃項目（2012BAJ01B02），國家自然科學(xué)基金資目（51308389）。作者簡介：韓業(yè)龍，碩士，Email:13512904913@163.com。A calculation method of horizontal deformation of cement-mixing-pile retaining structure considering the earth pressure in non-limit stateHan Yelong1, 2, Zheng Gang1, 2, Diao Yu1, 2, Nie Dongqing1, 2(1 Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 MOE Key Laboratory of Coast Civil Structure Safety, Tianjin 300072, China)Abstract: In the current design method, the Rankine's or Coulomb's earth pressure theory is generally used to calculate the earth pressure. Both of the two theories are based on the limit state of soil. However, since the soil usually has small displacement in working state, neither of the active or passive earth pressure could be reached. In other word, the soil is actually in non-limit state. According to the deformation characteristics of retaining structure, the quasi- exponential model was adopted to obtain the earth pressure in non-limit state, which is related to the displacement of retaining structure. Then, based on the energy method, the calculation method for the horizontal deformation of the cement-mixing-pile as retaining structure was established. The calculated results were verified by comparison with the measure results of case histories. It is found that the method considering the earth pressure in non-limit state has a high accuracy and practicability.Keywords: earth pressure; non-limit state; energy method; retaining structure; horizontal deformation
