本文選題：土壤　切入點(diǎn)：模型　出處：《農(nóng)業(yè)工程學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：利用基于軸平移技術(shù)的Geo-Expert高級(jí)型應(yīng)力相關(guān)土-水特征曲線壓力板儀研究不同覆土壓力(0、40、100、200 k Pa)對(duì)南陽(yáng)膨脹土土水特征曲線(soil-water characteristic curve,SWCC)的影響;并對(duì)提出的考慮土體變形及多孔隙分布形態(tài)的雙應(yīng)力變量廣義SWCC表征方程進(jìn)行如下試驗(yàn)驗(yàn)證:1)不同覆土壓力下微多孔隙分布形態(tài)的南陽(yáng)膨脹土側(cè)限固結(jié)試驗(yàn)及脫濕試驗(yàn)SWCC驗(yàn)證;2)零凈法向應(yīng)力狀態(tài)雙孔隙尺度硅藻土雙峰SWCC試驗(yàn)驗(yàn)證;3)不同凈圍壓狀態(tài)下單孔隙尺度韓國(guó)殘積土SWCC試驗(yàn)驗(yàn)證;4)多應(yīng)力路徑下法國(guó)Bapaume黃土,不同初始干密度下日本Edosaki砂土在脫濕-吸濕過程SWCC試驗(yàn)驗(yàn)證;并比較分析新方程與van Genuchten方程及Fredlund等方程的差異性。結(jié)果表明:1)覆土壓力會(huì)顯著改變膨脹土結(jié)構(gòu)及孔隙通道,進(jìn)而改變SWCC邊界效應(yīng)區(qū)、過渡區(qū)形態(tài);也改變了雙重孔隙尺度土壤的進(jìn)氣值;第1個(gè)波峰SWCC進(jìn)氣值均在1 k Pa左右;相比于零覆土壓力試樣,40、100、200 k Pa覆土壓力試樣第2個(gè)波峰SWCC進(jìn)氣值分別高4.74、17.58、67.23 k Pa;2)未考慮凈法向應(yīng)力影響的單應(yīng)力狀態(tài)多峰SWCC、考慮側(cè)限雙應(yīng)力狀態(tài)多峰SWCC、各向同性凈法向應(yīng)力單峰SWCC、不同脫濕-吸濕路徑SWCC及不同初始干密度的SWCC試驗(yàn)擬合曲線均表明,雙應(yīng)力廣義SWCC具有包容復(fù)雜影響因素的能力;3)新方程能夠利用至少3個(gè)土-水?dāng)?shù)據(jù)即可擬合出具有較高的精度的整條SWCC。研究為定量描述土壤的持水、滲透及強(qiáng)度特性提供參考。
[Abstract]:The influence of different overlying earth pressures on soil-water characteristic curved-water characteristic curve of Nanyang expansive soil was studied by using Geo-Expert advanced stress-related soil-water characteristic curve pressure plate based on axial translation technique. The generalized SWCC equation with double stress variables considering soil deformation and pore distribution was tested as follows: 1) the lateral consolidation test and dewatering of Nanyang expansive soil with micropore distribution under different overlying pressure were carried out. Wet test SWCC verification (No.2) double pore scale diatomite bimodal SWCC test verification of zero net normal stress state) issuance of orders under different net confining pressure states SWCC test of Korean residual soil with pore size verifies that (4) France Bapaume loess under multi-stress paths. Under different initial dry densities, the Edosaki sand in Japan was verified by SWCC test in the process of desiccation-moisture absorption, and the differences between the new equation and van Genuchten equation and Fredlund equation were compared and analyzed. The results show that the overlying earth pressure can significantly change the structure and pore channel of expansive soil. Then the shape of SWCC boundary effect zone, transition zone and the inlet value of double pore scale soil were changed. The first peak of SWCC air intake value was about 1 KPA. Compared with the zero overlying soil pressure specimen, the SWCC inlet value of the second peak of the second wave peak of the zero overlying earth pressure specimen is 4.74 ~ 17.58.67.23k Pao _ 2, respectively.) the multi-peak SWCCs without net normal stress effect are considered, and the multi-peak SWCCs with the lateral limit double stress state are considered, and the isotropic net SWCCs are taken into account. The fitting curves of normal stress single peak SWCC, SWCC with different desiccant and moisture absorption paths and different initial dry densities are obtained. The new equation can use at least three soil-water data to fit the whole SWCC with high accuracy. The study provides a reference for the quantitative description of soil water retention, permeability and strength characteristics.
【作者單位】： 西南大學(xué)工程技術(shù)學(xué)院;College
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目資助(11572262,41602354) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助(XDJK2016D016,XDJK2016B006)
【分類號(hào)】：TU43

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