【摘要】：土體是在復雜地質構造運動和應力歷史下形成的沉積物,這使得其在空間中不同位置的物理力學性質具有不同程度的差異,其在空間上通常具有不規(guī)則成層分布的特性,并且同一土層內部的巖土參數具有空間變異性。因此,巖土工程結構設計之前需要在建筑場地內進行地質勘探以得到所需要的地質資料。然而,通過地質勘探所獲得的地質數據是離散的,不能完全確定場地內未勘探區(qū)域的地質數據。為了給工程設計提供充足可靠的依據,基于有限鉆孔對土體成層結構及空間變異性進行研究很有必要。土體成層結構研究方面,空間插值法不能用于復雜的土層模擬,變差函數法雖然可以模擬復雜地層的分布,然而其所模擬的地層連續(xù)性較差。相比之下,耦合馬爾可夫鏈模型則可以克服以上問題,但是該模型無法模擬具有不同傾斜方向的地層交界面,也不能準確模擬地層中的棱鏡體。本文對耦合馬爾可夫鏈模型進行了改進,編制了相關程序,并驗證了程序的正確性。改進的耦合馬爾可夫鏈模型能夠較好地模擬地質剖面內不同傾斜方向的地層交界面及變異地層(如棱鏡體)�；隈詈像R爾可夫鏈模型研究了鉆孔布置方案對地層模擬結果的影響,鉆孔的位置對耦合馬爾可夫鏈模擬復雜土體成層結構可能產生較大的影響,并且同一土層內部出現(xiàn)變異的概率會隨著鉆孔間距的增加而增加。本文還分析了獲得幾種常見的土體成層結構的穩(wěn)定模擬結果所需要的鉆孔數量。同一土層內的空間變異性可以通過隨機場理論進行研究,然而隨機場會高估土體的空間變異性,這是因為它對地質勘探點的數據仍然采用隨機模擬的方式生成。因此,本文研究了能夠充分利用場地內實測值,并有效減小巖土參數空間變異性的三維條件隨機場方法,編制了相應程序并驗證了程序的正確性。基于三維條件隨機場的方法,本文還研究了鉆孔位置和鉆孔數量對巖土參數空間變異性的影響,發(fā)現(xiàn)當巖土參數的相關性符合指數平方型相關函數時,條件隨機場內勘探數據的主要約束距離約為該方向波動范圍的一半,并且條件隨機場預測值的精度受預測點周圍的鉆孔數量以及巖土參數變異系數的共同影響。
[Abstract]:Soil mass is a sediment formed under the complex geological tectonic movement and stress history, which makes the physical and mechanical properties of different positions in space different, and it usually has the characteristics of irregular stratified distribution in space. And the geotechnical parameters in the same soil layer have spatial variability. Therefore, geological exploration should be carried out in the construction site before the structural design of geotechnical engineering to obtain the required geological data. However, the geological data obtained from geological exploration are discrete, and the geological data of the unexplored area in the site cannot be determined completely. In order to provide sufficient and reliable basis for engineering design, it is necessary to study layered structure and spatial variability of soil based on finite drilling. In the study of layered structure of soil, the spatial interpolation method can not be used to simulate the complex soil layer. Although the variation function method can simulate the distribution of complex strata, the continuity of the simulated strata is poor. In contrast, the coupled Markov chain model can overcome the above problems, but the model can not simulate the stratigraphic interface with different inclined directions, nor can it accurately simulate the prism in the stratum. In this paper, the coupling Markov chain model is improved, and the related program is compiled, and the correctness of the program is verified. The improved coupled Markov chain model can well simulate the stratigraphic interface and variation strata (such as prism) in the geological section with different tilting directions. Based on the coupling Markov chain model, the influence of borehole layout scheme on the simulation results is studied. The location of borehole may have a great influence on the layered structure of complex soil mass simulated by coupled Markov chain model. And the probability of variation in the same soil layer increases with the increase of borehole spacing. The number of holes needed to obtain the stability simulation results of several common layered soil structures is also analyzed in this paper. The spatial variability in the same soil layer can be studied by random field theory, but the random field overestimates the spatial variability of soil because it still generates the data of geological exploration points by random simulation. Therefore, this paper studies a three-dimensional conditional random field method which can make full use of the measured data in the site and effectively reduce the spatial variability of geotechnical parameters. The corresponding program is compiled and the correctness of the program is verified. Based on the method of three-dimensional conditional random field, this paper also studies the influence of borehole location and number on spatial variability of geotechnical parameters. It is found that when the correlation of geotechnical parameters conforms to exponential square type correlation function, The main constraint distance of exploration data in conditional random field is about half of the range of fluctuation in this direction, and the accuracy of conditional random field prediction is affected by the number of holes around the predicted point and the coefficient of variation of geotechnical parameters.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU43

【參考文獻】

相關期刊論文 前10條

1 張明明;李曉暉;袁峰;胡訓宇;王興會;;地層三維建模及面模型插值方法對比研究[J];安徽地質;2015年03期

2 張鳳青;宋永忠;于晶;;隨機順序指示模擬技術在地震儲層預測中的應用[J];石油工業(yè)計算機應用;2013年03期

3 李軍;楊曉娟;張曉龍;熊利平;;基于三維馬爾可夫鏈模型的巖性隨機模擬[J];石油學報;2012年05期

4 申靜;蘇天峗;王國宇;劉海行;李家鋼;;基于Kriging算法的海底地形插值設計與實現(xiàn)[J];海洋科學;2012年05期

5 沈峰;陳新民;;基于鉆孔資料的三維地層可視化[J];西部探礦工程;2008年08期

6 朱紅霞;閆澍旺;;天津港地基土隨機場特性及可靠度分析[J];巖石力學與工程學報;2007年S2期

7 劉振峰,郝天珧,楊長春;沉積模型和儲層隨機建模[J];地球物理學進展;2003年03期

8 馮國慶,陳軍,張烈輝;布爾模擬與模擬退火結合的兩階段模擬方法及其應用[J];中國海上油氣.地質;2003年04期

9 陳恭洋;碎屑巖儲層隨機建模的基本理論與實踐[J];江漢石油學院學報;2001年04期

10 洪昌華,龔曉南,趙良榮;土性空間變異性的統(tǒng)計模擬[J];浙江大學學報(工學版);2000年05期

相關博士學位論文 前1條

1 祁小輝;考慮土體不均勻性的巖土工程可靠度分析[D];武漢大學;2015年

相關碩士學位論文 前2條

1 梁玉汝;基于雙向Markov鏈的巖相儲層隨機模擬[D];中南大學;2014年

2 王正芳;基于隨機場理論的裂隙非飽和水力特性研究及其誘發(fā)滑坡的分析[D];哈爾濱工業(yè)大學;2011年

，

本文編號：2434545