本文選題：軟粘土 + 各向異性　； 參考：《江西理工大學(xué)》2015年碩士論文

【摘要】：軟粘土地基上修筑的高速公路、機(jī)場(chǎng)跑道、跨海大橋等交通工程在循環(huán)交通荷載作用下,往往會(huì)產(chǎn)生過大的工后沉降,這是因?yàn)樵谧灾睾奢d和交通荷載作用下軟粘土中的應(yīng)力路徑十分復(fù)雜,主要表現(xiàn)在以下兩個(gè)方面,第一,軟粘土具有明顯的各向異性,這種各向異性一方面和K0固結(jié)有關(guān),另一方面則由路基中的應(yīng)力引起。第二,在循環(huán)交通荷載作用下,軟粘土單元體中的主應(yīng)力軸還會(huì)發(fā)生連續(xù)旋轉(zhuǎn)。因此,開展各向異性軟粘土在主應(yīng)力軸旋轉(zhuǎn)作用下的靜動(dòng)力特性試驗(yàn)研究是解決軟土地基工程災(zāi)變問題的重要手段。本文以溫州軟粘土為研究對(duì)象,主要做了以下工作:1.研制出一種制備重塑土的儀器即高壓固結(jié)儀,利用該儀器通過一系列的加工工藝流程制備出高質(zhì)量的重塑軟粘土,分別取與土樣沉積方向呈0°、30°、45°、60°、90°的原狀土樣和重塑土樣,對(duì)每種角度的原狀和重塑土樣依次分別進(jìn)行壓縮試驗(yàn)、滲透試驗(yàn)、直剪試驗(yàn),結(jié)果表明:無論是重塑土樣還是原狀土樣,其壓縮模量、滲透系數(shù)、抗剪強(qiáng)度等方面都存在各向異性。2.利用GDS空心扭剪系統(tǒng),對(duì)原狀溫州飽和軟粘土開展與大主應(yīng)力方向分別呈0°,30°,45°,60°,90°的定向剪切試驗(yàn),結(jié)果表明:不同主應(yīng)力方向角下的剪切,主應(yīng)力、主應(yīng)變、應(yīng)力-應(yīng)變關(guān)系曲線變化規(guī)律差別較大,偏應(yīng)力峰值和內(nèi)摩擦角也互不相同,且偏應(yīng)力峰值在0°剪切時(shí)最大,而有效內(nèi)摩擦角最大值出現(xiàn)在45°剪切。3.利用GDS空心扭剪系統(tǒng),通過使用自定義的波形及心臟線形應(yīng)力路徑的加載,模擬了實(shí)際工程中交通荷載作用下土單元體中主應(yīng)力軸連續(xù)旋轉(zhuǎn)的應(yīng)力路徑,研究了主應(yīng)力軸連續(xù)旋轉(zhuǎn)作用下,軟粘土中應(yīng)變、孔壓、彈性模量的變化規(guī)律,結(jié)果還發(fā)現(xiàn),與不考慮主應(yīng)力方向變化的動(dòng)三軸試驗(yàn)結(jié)果相比,主應(yīng)力軸旋轉(zhuǎn)會(huì)加快軟粘土應(yīng)變、孔壓的累積和土體的軟化。最后建立了考慮主應(yīng)力軸旋轉(zhuǎn)作用的軟粘土累積應(yīng)變預(yù)測(cè)方程。
[Abstract]:Highway, airport runway, cross-sea bridge and other traffic projects built on soft clay foundation often produce excessive post-construction settlement under cyclic traffic load. This is because the stress paths in soft clay under gravity and traffic loads are very complex and are mainly manifested in the following two aspects: first, the soft clay has obvious anisotropy, which is related to K _ 0 consolidation on one hand. On the other hand, it is caused by the stress in the roadbed. Secondly, under cyclic traffic load, the principal stress axis in the soft clay element will rotate continuously. Therefore, the static and dynamic behavior of anisotropic soft clay under the rotation of principal stress axis is an important means to solve the problem of engineering disaster in soft soil foundation. In this paper, Wenzhou soft clay as the research object, mainly do the following work: 1. A high pressure consolidation instrument for the preparation of remolded soil was developed. High quality soft clay was prepared by a series of processing processes. The original and remolded soil samples with the direction of 0 擄~ 30 擄~ 45 擄~ 45 擄~ 60 擄~ (90 擄) and remolded soil samples were obtained, respectively, when the soil was deposited in the direction of 0 擄~ 30 擄~ 45 擄~ (45 擄) or 60 擄~ 90 擄. Compression tests, permeation tests, and direct shear tests were carried out on the original and remolded soil samples at each angle, respectively. The results showed that the compression modulus and permeability coefficient of the original soil samples, whether the remolded soil samples or the original soil samples, were tested respectively. The shear strength is anisotropic. Using GDS hollow torsional shear system, the directional shear tests of Wenzhou saturated soft clay were carried out in the direction of 0 擄/ 30 擄/ 45 擄/ 60 擄/ 90 擄respectively with large principal stress direction. The results show that the shear, principal stress and principal strain of Wenzhou saturated soft clay in different principal stress directions are different from each other. The variation law of stress-strain relation curve is quite different, the peak value of deflection stress and the angle of internal friction are also different, and the peak value of deviant stress is maximum at 0 擄shear, and the maximum value of effective internal friction angle appears at 45 擄shear. 3. By using the GDS hollow torsional shear system, by using the self-defined waveform and the loading of the linear stress path of the heart, the stress path of continuous rotation of the principal stress axis in the soil element under the traffic load in the actual engineering is simulated. The variation of strain, pore pressure and modulus of elasticity in soft clay under continuous rotation of principal stress axis is studied. It is also found that the dynamic triaxial test results are compared with those of dynamic triaxial test without considering the direction of principal stress. Rotation of principal stress axis accelerates strain, pore pressure accumulation and softening of soft clay. Finally, the cumulative strain prediction equation of soft clay considering the rotation of principal stress axis is established.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊彥豪;周建;周紅星;;主應(yīng)力軸旋轉(zhuǎn)條件下軟黏土的非共軸研究[J];巖石力學(xué)與工程學(xué)報(bào);2015年06期

2 嚴(yán)佳佳;周建;龔曉南;曹洋;劉正義;;主應(yīng)力軸循環(huán)旋轉(zhuǎn)條件下重塑黏土變形特性試驗(yàn)研究[J];土木工程學(xué)報(bào);2014年08期

3 柳艷華;謝永利;;主應(yīng)力軸旋轉(zhuǎn)下原狀軟黏土的變形及強(qiáng)度特性[J];長(zhǎng)安大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年04期

4 曹洋;周建;嚴(yán)佳佳;;原狀軟黏土主應(yīng)力軸動(dòng)態(tài)旋轉(zhuǎn)試驗(yàn)研究[J];中南大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年03期

5 楊蘊(yùn)明;YU Hai-sui;;模擬主應(yīng)力軸旋轉(zhuǎn)的本構(gòu)模型（英文）[J];巖土工程學(xué)報(bào);2013年S2期

6 肖軍華;許世芹;韋凱;洪英維;;主應(yīng)力軸旋轉(zhuǎn)對(duì)地鐵荷載作用下 軟黏土累積變形的影響[J];巖土力學(xué);2013年10期

7 張健;翟劍峰;王仙美;陳景雅;;波浪荷載作用下非均等固結(jié)飽和粉土孔壓特性研究[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2013年04期

8 董彤;鄭穎人;劉元雪;阿比爾的;;考慮主應(yīng)力軸旋轉(zhuǎn)的土體本構(gòu)關(guān)系研究進(jìn)展[J];應(yīng)用數(shù)學(xué)和力學(xué);2013年04期

9 嚴(yán)佳佳;周建;管林波;龔曉南;;杭州原狀軟黏土非共軸特性與其影響因素試驗(yàn)研究[J];巖土工程學(xué)報(bào);2013年01期

10 蔣明鏡;李立青;劉芳;蘇佳興;;主應(yīng)力方向和偏應(yīng)力比對(duì)TJ-1模擬月壤各向異性的影響[J];巖土力學(xué);2013年01期

相關(guān)博士學(xué)位論文 前4條

1 郭林;復(fù)雜應(yīng)力路徑下飽和軟粘土靜動(dòng)力特性試驗(yàn)研究[D];浙江大學(xué);2013年

2 聶影;復(fù)雜應(yīng)力條件下飽和重塑黏土動(dòng)力特性試驗(yàn)研究[D];大連理工大學(xué);2008年

3 沈揚(yáng);考慮主應(yīng)力方向變化的原狀軟粘土試驗(yàn)研究[D];浙江大學(xué);2007年

4 郭瑩;復(fù)雜應(yīng)力條件下飽和松砂的不排水動(dòng)力特性試驗(yàn)研究[D];大連理工大學(xué);2003年

相關(guān)碩士學(xué)位論文 前2條

1 管林波;主應(yīng)力軸旋轉(zhuǎn)對(duì)原狀軟粘土宏觀變形和微觀結(jié)構(gòu)影響的試驗(yàn)研究[D];浙江大學(xué);2010年

2 楊立偉;主應(yīng)力軸旋轉(zhuǎn)情況下原狀軟粘土應(yīng)力應(yīng)變?cè)囼?yàn)研究[D];浙江大學(xué);2009年

，

本文編號(hào)：1944697