【摘要】：深厚覆蓋層土體原位結(jié)構(gòu)性強(qiáng),原狀樣取樣困難,且由于粒徑、級配的改變,室內(nèi)重塑樣試驗(yàn)確定的力學(xué)參數(shù)不能反映原位土體的實(shí)際性質(zhì),如何考慮原位結(jié)構(gòu)效應(yīng)確定深厚覆蓋層土體的力學(xué)參數(shù)是工程建設(shè)中的難題。本文探索了聯(lián)合現(xiàn)場原位試驗(yàn)和室內(nèi)重塑樣動(dòng)力特性試驗(yàn),考慮原位結(jié)構(gòu)效應(yīng)確定深厚覆蓋層土體動(dòng)強(qiáng)度參數(shù)的方法:(1)基于現(xiàn)場試驗(yàn)確定原位土體的動(dòng)強(qiáng)度基準(zhǔn)值;(2)基于室內(nèi)重塑樣試驗(yàn)確定動(dòng)強(qiáng)度在不同振動(dòng)強(qiáng)度和固結(jié)應(yīng)力條件下的變化規(guī)律;(3)結(jié)合室內(nèi)動(dòng)力試驗(yàn)確定的動(dòng)強(qiáng)度參數(shù)變化規(guī)律,將基于現(xiàn)場試驗(yàn)確定的動(dòng)強(qiáng)度基準(zhǔn)值推延至多種震級和應(yīng)力條件。以某實(shí)際深厚覆蓋層深埋砂土為研究對象,聯(lián)合現(xiàn)場標(biāo)貫試驗(yàn)和室內(nèi)動(dòng)三軸試驗(yàn)結(jié)果,綜合確定了能考慮深厚覆蓋層土體原位結(jié)構(gòu)效應(yīng)的砂土動(dòng)強(qiáng)度參數(shù),并與室內(nèi)試驗(yàn)結(jié)果進(jìn)行了對比。研究成果可為該工程壩體—覆蓋層地基系統(tǒng)抗震安全評價(jià)提供依據(jù),也可供類似工程參考。
[Abstract]:The in-situ structure of deep overburden soil is strong, and it is difficult to sample in-situ. Because of the change of particle size and gradation, the mechanical parameters determined by indoor remodeling test can not reflect the actual properties of in-situ soil. How to determine the mechanical parameters of deep overburden soil considering in-situ structure effect is a difficult problem in engineering construction. In-situ test and in-situ test of dynamic characteristics of remolded samples, considering in-situ structural effects to determine the dynamic strength parameters of deep overburden soil: (1) based on in-situ test to determine the dynamic strength of in-situ soil reference value; (2) based on in-situ remolded sample test to determine the dynamic strength under different vibration strength and consolidation stress conditions; (2) based on in-situ test to determine the dynamic strength of remolded samples under different conditions of consolidation 3) Based on the dynamic strength parameters determined by indoor dynamic tests, the dynamic strength datum values determined by field tests are extended to various magnitudes and stress conditions. The dynamic strength parameters of sandy soil due to in-situ structural effect of soil mass are compared with the laboratory test results. The research results can provide a basis for seismic safety evaluation of the dam-overburden foundation system of the project and a reference for similar projects.
【作者單位】： 流域水循環(huán)模擬與調(diào)控國家重點(diǎn)實(shí)驗(yàn)室中國水利水電科學(xué)研究院;水利部水工程抗震與應(yīng)急支持工程技術(shù)研究中心;
【基金】：國家自然科學(xué)基金項(xiàng)目(51679264,51209234,51509272) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃暨973計(jì)劃課題(2013CB036404) 國家科技支撐計(jì)劃課題(2013BAB06B02) 水利部公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(201501035) 中國水科院科研專項(xiàng)(GE0145C092016)
【分類號(hào)】：TU413

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