本文選題：動力觸探 + 修正系數(shù)　； 參考：《沈陽建筑大學》2015年碩士論文

【摘要】：動力觸探(DPT:dynamic penetration test)作為現(xiàn)場原位測試手段之一,具有試驗設(shè)備相對簡單、操作起來方便、適應土類較為廣泛、效率高、并且可以連續(xù)貫入等優(yōu)點,在工程界應用較為廣泛。實測觸探擊數(shù)需根據(jù)桿長進行折減修正才可用于評價巖土參數(shù)。但現(xiàn)行國家規(guī)范和地方規(guī)范中對桿長修正深度和擊數(shù)都有一個限值,例如《巖土工程勘察規(guī)范》GB50021-2001(2009版),只給出了桿長20米以內(nèi)的修正系數(shù)。實際生產(chǎn)過程中,動力觸探還是標準貫入度試驗實際使用深度已遠遠超過20m,甚至到lOOm以上,對于超過限定深度的動探擊數(shù)如何修正目前尚沒有統(tǒng)一規(guī)定。動力觸探的理論基礎(chǔ)大致可分為兩部分,一部分是以彈性桿牛頓碰撞理論為理論基礎(chǔ),它的特點是桿長修正系數(shù)隨著桿長的增加而減小。另一部分是以彈性波動理論為理論基礎(chǔ),該理論特點是桿長修正系數(shù)隨著桿長的增加而增大,最后等于1。本文結(jié)合工程實例數(shù)據(jù),利用數(shù)值分析軟件,對動力觸探進行數(shù)值模擬試驗并將模擬出的結(jié)果與工程實例和參考文獻進行比對與總結(jié)。研究成果也可作為標準貫入試驗結(jié)果的桿長修正的參考。本文主要進行了以下幾個方面的研究工作：(1)通過收集大量的工程實測數(shù)據(jù),并進行一定的室內(nèi)試驗、現(xiàn)場試驗,研究卵石和砂土的物理力學特性和相關(guān)參數(shù)；(2)本文在研究重型動力觸探試驗的一般機理、技術(shù)要求和工程應用的基礎(chǔ)上,著重分析重型動力觸探試驗在工程實例中的卵石土層的應用特點和參數(shù)修正；(3)利用數(shù)值模擬軟件,建立動力觸探模型。通過對觸探桿和土體模型簡化確定,以及觸探桿和土體之間的接觸方式的選取,最終建立起初始模型。然后根據(jù)工程實例數(shù)據(jù)對該數(shù)值模型進行試算,得到的結(jié)果與工程實際作對比。驗證模型的可行性；(4)通過對卵石、中砂兩種土體的模擬驗算,得到不同土體在2m、8.9m、16.4m、 23.4m、30m、36m、50m時的修正系數(shù)與桿長的曲線關(guān)系。得到不同土體對桿長修正系數(shù)的影響程度。
[Abstract]:As one of the in-situ testing methods, DPT: dynamic penetration test has the advantages of relatively simple test equipment, convenient operation, wide adaptability to soil, high efficiency and continuous penetration. It is widely used in engineering field. The measured penetration number can be used to evaluate geotechnical parameters only by modifying the length of rod. However, there is a limit to the corrected depth and hit number of rod length in the current national and local codes, such as the Geotechnical Engineering Prospecting Code (GB50021-20012009), and only the correction coefficient of the length of the rod within 20 meters is given. In the actual production process, the actual application depth of dynamic penetration test or standard penetration test has far exceeded 20m, even above lOOm. At present, there is no uniform regulation on how to correct the number of dynamic penetration over the limited depth. The theoretical basis of dynamic penetration detection can be divided into two parts. One part is based on the Newton collision theory of elastic rod. Its characteristic is that the correction coefficient of rod length decreases with the increase of rod length. The other part is based on elastic wave theory, which is characterized by that the correction coefficient of rod length increases with the increase of rod length and is equal to 1. In this paper, the numerical simulation test of dynamic penetration is carried out by using numerical analysis software combined with engineering case data, and the simulated results are compared and summarized with engineering examples and references. The research results can also be used as a reference for the correction of the standard penetration test results. In this paper, the following aspects of the research work: 1) through the collection of a large number of engineering data, and a certain number of indoor tests, field tests, to study the pebble and sand physical and mechanical properties and related parameters; 2) based on the study of the general mechanism, technical requirements and engineering application of the heavy-duty dynamic penetration test, the application characteristics and parameters correction of the heavy-duty dynamic penetration test in the pebble soil layer in the engineering example are emphatically analyzed in this paper. 3) using numerical simulation software to establish dynamic penetration model. The initial model was established through the simplified determination of the sounding rod and soil model and the selection of the contact mode between the sounding rod and the soil. Then the numerical model is calculated according to the engineering example data, and the result is compared with the engineering practice. To verify the feasibility of the model, the relationship between the correction coefficient and the rod length of different soils at 2mm ~ 8.9m ~ 16.4m, 23.4m ~ 30m ~ 36m ~ (50 m) was obtained through the simulation and calculation of pebble and middle sand soil. The influence degree of different soil on the correction coefficient of rod length is obtained.
【學位授予單位】：沈陽建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU413

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