本文關(guān)鍵詞： 觸變性 無側(cè)限抗壓強度 觸變強度恢復(fù)程度 觸變強度比率 粉土　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：社會經(jīng)濟的不斷發(fā)展促使世界各地建筑物不斷地超越原有的建筑模式，地基的可靠性越來越受到人們的重視。工程實際中土體的觸變性可能導(dǎo)致地基土體強度降低，造成失穩(wěn)滑坡、工后沉降等工程災(zāi)害。為減少這些工程地質(zhì)災(zāi)害，人們對于土的觸變性的研究越來越多，在以往的研究工作中，人們更多關(guān)注土體觸變機理和觸變強度的恢復(fù)趨勢，而對于土體的觸變強度恢復(fù)影響因素的研究則比較少。 本文在諸多國內(nèi)外學(xué)者針對觸變性的研究成果基礎(chǔ)上，圍繞著粉土觸變強度恢復(fù)特征進行研究，用無側(cè)限抗壓強度試驗反映強度變化，采用原狀土進行室內(nèi)振動試驗，用以模擬現(xiàn)場土體振動，，研究不同擾動程度下土體的強度恢復(fù)程度變化規(guī)律；結(jié)合土工試驗規(guī)范中擊實試樣的制備方法，在控制其他變量不變的情況下，制備不同干密度、擊實含水率、粉黏粒含量下的擊實試樣，研究不同影響因子下土體強度恢復(fù)的規(guī)律。分析試驗結(jié)果得到的結(jié)論如下： (1)通過不同振動時間控制試樣擾動程度，對不同擾動程度的試樣進行無側(cè)限抗壓強度試驗，得出不同擾動程度的無側(cè)限抗壓強度試驗應(yīng)力-變形曲線，分析繪出的應(yīng)力-變形曲線得出，擾動程度越大的土體，其無側(cè)限抗壓強度越小。對不同擾動程度的試樣進行相同時間的靜置，繪制靜置之后試樣的無側(cè)限抗壓強度試驗應(yīng)力-變形曲線，根據(jù)靜置前后的應(yīng)力-變形曲線比較得出，經(jīng)過一段時間的靜置之后，不同擾動程度的試樣強度均有所恢復(fù)。 (2)討論不同擾動程度下粉土試樣觸變強度的絕對強度恢復(fù)程度和相對強度恢復(fù)程度，繪制兩種強度恢復(fù)程度與擾動程度關(guān)系曲線，分析曲線可知，擾動粉土的絕對觸變強度恢復(fù)程度與擾動程度為正相關(guān)關(guān)系，而相對觸變強度恢復(fù)程度與擾動程度為負相關(guān)關(guān)系。 (3)根據(jù)前人成果，引入擾動程度比率和觸變強度比率的公式定義，前者可判定試樣受擾動影響強弱，后者用來判定試樣的觸變性影響強弱�？赏ㄟ^兩者估算擾動粉土的觸變強度的絕對恢復(fù)程度和相對恢復(fù)程度。 (4)用自制擊實儀在保證一定擊實功的情況下，制備不同擊實含水率、干密度、粉黏粒含量的擊實粉土試樣，并對試樣進行抽真空飽和。對飽和擊實試樣進行無側(cè)限抗壓強度試驗，分析不同影響因子下無側(cè)限抗壓強度試驗應(yīng)力-變形曲線可知，擊實粉土的無側(cè)限抗壓強度受擊實含水率影響，干側(cè)時強度較高，濕側(cè)時強度較低，且擊實粉土的無側(cè)限抗壓強度隨干密度的增加而升高,隨粉黏粒含量的增加而降低。 (5)取靜置后的飽和擊實粉土試樣進行無側(cè)限抗壓強度試驗，用觸變強度比率反映擊實粉土觸變性影響強弱，將試驗所得強度代入觸變強度比率公式，繪制觸變強度比率-影響因子曲線，分析可得，擊實粉土的觸變性與干密度、粉黏粒含量成正相關(guān)關(guān)系，在干側(cè)與擊實含水率負相關(guān)，濕側(cè)與擊實含水率正相關(guān)。
[Abstract]:The economic and social development to promote building around the world continue to go beyond the original building foundation model, reliability is more and more attention. The thixotropic soil in engineering practice may lead to reduction in soil strength, instability caused by landslide, settlement after construction engineering disasters. In order to reduce the engineering geological disaster, people study and more for the thixotropy of soil in the research work in the past, people pay more attention to the soil and the thixotropic mechanism thixotropic strength recovery trend, and recovery factors on the thixotropic strength of soil is relatively small.
In this paper, many scholars at home and abroad based on the research achievements of thixotropy, surrounding silt thixotropic strength recovery characteristics were studied, with no changes reflect the strength compressive strength test with undisturbed soil unconfined, indoor vibration test to simulate the in-situ Vibration Research of different disturbance degree of soil under the strength variation degree recovery; preparation method combined with soil test standard compaction sample, after controlling for other variables remain unchanged, the preparation of different dry density, moisture content, clay powder compaction particle content, soil strength recovery factor of different under the influence of law. Analysis of the test results were presented as follows:
(1) through different vibration time control sample disturbance degree of samples with different disturbance degrees of unconfined compressive strength test, stress deformation curves of unconfined compressive strength test of the different degree of disturbance, analysis draw stress deformation curves, soil disturbance degree, the unconfined the compressive strength decreases. The static of the same time on samples with different disturbance degrees, drawing static specimens after the unconfined compressive strength test stress-strain curve, according to the static stress-strain curve before and after comparison, after standing for a long time, the strength of sample recovery different degree of disturbance.
(2) discuss the absolute intensity of silt samples under different disturbance degree of thixotropic strength recovery and relative intensity degree of recovery, the drawing of the two strength and the recovery of the disturbance degree curve, curve analysis, absolute thixotropic strength of silty soil disturbance and the recovery of the disturbance degree of positive correlation, and the relative degree of recovery of thixotropic strength the disturbance degree is negatively correlated.
(3) according to the previous results, the introduction of the definition of the disturbance degree formula ratio and thixotropic strength ratio, the former can determine the specimen affected by disturbance intensity, the influence of thixotropic strength. Can be used to determine the sample estimate the thixotropic strength of silty soil disturbance through both the absolute and relative degree of recovery degree of recovery.
(4) in a certain compaction work with self-made compaction device under the condition of the preparation of different compaction water content, dry density, specimen compacted silt silt and clay content, and the samples were vacuum saturation. The unconfined compressive strength test of saturated compacted samples, analysis of different influence no factor of stress deformation curve of unconfined compressive strength test, compacted silty soil unconfined compressive strength affected by moisture content, high strength of the dry side, the wet side when the strength is low, and the compacted silty soil unconfined compressive strength increased with the increase of the dry density. With the increase of silt and clay content decreased.
(5) the static saturated compacted silt samples of unconfined compressive strength test of compacted silt, thixotropic strength of thixotropic strength ratio, the strength test results into the thixotropic strength ratio formula, draw the thixotropic strength ratio influence factor curve analysis, compacted silts thixotropy and dry density, silt and clay content are positively correlated, in the dry side and the moisture content of the wet side and negative correlation, compaction water content are related.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU411

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