本文選題：花崗巖殘積土 + 應(yīng)力路徑��； 參考：《湖南工業(yè)大學(xué)》2017年碩士論文

【摘要】：由于花崗巖殘積土存在的地區(qū)的基礎(chǔ)設(shè)施發(fā)展量的增加,需要更好的理解和量化花崗巖殘積土的性質(zhì)和行為,為花崗巖地區(qū)的基坑支護土石方工程、邊坡地質(zhì)災(zāi)害治理工程等巖土工程技術(shù)設(shè)計提供資料。以深圳市花崗巖殘積土為研究對象,采用室內(nèi)試驗與數(shù)值模擬相結(jié)合的方法,研究不同應(yīng)力路徑條件對花崗巖殘積土的強度與變形特性的影響。力學(xué)試驗包含花崗巖殘積土的基本物理性質(zhì)試驗、基質(zhì)吸力強度試驗、壓縮試驗下的結(jié)構(gòu)變形特征試驗、常規(guī)三軸壓縮(CTC)試驗、減壓壓縮(RTC)試驗、恒定平均應(yīng)力壓縮(TC)試驗、K0合并固結(jié)壓縮試驗、基于鄧肯-張模型的數(shù)值計算與試驗結(jié)果擬合研究,圍壓的范圍為50kPa~500kPa。試驗以三軸剪切為主,以探討應(yīng)力路徑對花崗巖殘基土強度與變形的影響。綜合本研究的成果主要可分為四個部分,分別為:花崗巖殘積土的強度特征方面,在不同圍壓條件下,飽和花崗巖殘積土軸向伸張試驗的抗剪強度及破壞應(yīng)變明顯低于軸向壓縮試驗,此一結(jié)果顯示,若以軸向壓縮試驗取代軸向伸張試驗,則強度將有被高估的現(xiàn)象。結(jié)構(gòu)性花崗巖殘積土的壓縮變形特征方面,當(dāng)含水量增加時,結(jié)構(gòu)參數(shù)曲線較穩(wěn)定,一些強化結(jié)構(gòu)耦合已被破壞,土壓力引起的土體密度的增加會使殘留的花崗巖土體結(jié)構(gòu)變異性降低,可以增加結(jié)構(gòu)穩(wěn)定性。三軸剪切路徑下花崗巖殘積土工程特性對比研究方面,湖南花崗巖殘積土破壞時的主應(yīng)力差要小于深圳花崗巖殘積土破壞時的主應(yīng)力差,而其體應(yīng)變大于深圳花崗巖殘積土的體應(yīng)變,湖南花崗巖殘積土的強度指標(biāo)稍小于深圳花崗巖殘積土的強度指標(biāo)�；卩嚳�-張模型的數(shù)值計算與試驗結(jié)果擬合研究方面,當(dāng)圍壓處于較高狀態(tài),改進的鄧肯-張模型能準(zhǔn)確的描述花崗巖殘積土的應(yīng)力-應(yīng)變;當(dāng)圍壓處于低壓狀態(tài),改進曲線預(yù)測和測量曲線模型可以更準(zhǔn)確地反映花崗巖殘積土的應(yīng)力-應(yīng)變工程特性。如果今后對花崗巖殘積土的研究更深入,這項成果可以延伸到研究其他區(qū)域的花崗巖殘積土,作為對其結(jié)果普適性的探討與延伸,這對花崗巖殘積土這種特殊土的理解、掌握和應(yīng)用具有現(xiàn)實意義和工程價值。
[Abstract]:Because of the increase of infrastructure development in the area where granite residual soil exists, it is necessary to better understand and quantify the nature and behavior of granite residual soil in order to support earthwork engineering in foundation pit in granite area. The technical design of geotechnical engineering such as slope geological hazard control project provides data. Taking the granite residual soil in Shenzhen as the research object, the influence of different stress path conditions on the strength and deformation characteristics of the granite residual soil was studied by means of laboratory test and numerical simulation. The mechanical tests include the basic physical properties of granite residual soil, the matrix suction strength test, the structural deformation characteristic test under compression test, the conventional triaxial compression CTC test, the decompression compression test and the RTC test. Constant mean stress compression test (TC0) combined with consolidation compression test is carried out. The range of confining pressure is in the range of 50kPa500kPa. based on the numerical calculation of Duncan-Chang model and the fitting of experimental results. Triaxial shear was used to study the influence of stress path on the strength and deformation of granite residual soil. The results of this study can be divided into four parts: the strength characteristics of granite residual soil, under different confining pressure conditions, The shear strength and failure strain of saturated granite residual soil are obviously lower than that of axial compression test. The results show that the strength will be overestimated if the axial tensile test is replaced by axial compression test. In terms of the compressive deformation characteristics of structural granite residual soil, when the water content is increased, the structural parameter curve is more stable, and some strengthened structural coupling has been destroyed. The increase of soil density caused by earth pressure will decrease the structural variability of the residual granite soil and increase the structural stability. In the aspect of comparative study on engineering characteristics of granite residual soil under triaxial shear path, the principal stress difference of granite residual soil in Hunan Province is smaller than that in Shenzhen granite residual soil failure. The bulk strain is larger than that of the granite residual soil in Shenzhen, and the strength index of the granite residual soil in Hunan is slightly smaller than that of the granite residual soil in Shenzhen. On the basis of the numerical calculation of Duncan Chang model and the fitting of experimental results, when the confining pressure is in a high state, the improved Duncan Chang model can accurately describe the stress-strain of the granite residual soil, and when the confining pressure is in the low pressure state, The improved curve prediction and measurement curve model can more accurately reflect the stress-strain engineering characteristics of granite residual soil. If further research on granite residual soil is carried out in the future, this result can be extended to the study of granite residual soil in other regions as an exploration and extension of the universality of its results, which is the understanding of granite residual soil as a special soil. It is of practical significance and engineering value to master and apply.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU41

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