典型堆積層滑坡抗滑樁土拱形成機(jī)理研究
發(fā)布時(shí)間：2018-11-26 20:21
【摘要】：堆積層滑坡是滑坡的一種基本類型,坡體組份多為碎石土(粗粒土),抗滑樁在此類型滑坡治理工程中得到廣泛應(yīng)用；抗滑樁設(shè)計(jì)的主要內(nèi)容之一是確定抗滑樁的排列間距,合理的間距布置可以形成土拱,并能最大限度的發(fā)揮抗滑樁之間土體的自承載能力。目前關(guān)于抗滑樁中土拱的形成機(jī)理尚有待進(jìn)一步研究。因此,本文針對(duì)性的開展了抗滑樁中土拱形成機(jī)理的理論和數(shù)值研究,分析抗滑樁的樁-土相互作用機(jī)理、荷載傳遞規(guī)律等問題,為抗滑樁的設(shè)計(jì)與間距的確定提供技術(shù)支撐與參考。 論文從分析堆積層滑坡的基本特征入手,選取三峽庫區(qū)典型堆積層滑坡——馬家溝滑坡為研究對(duì)象,通過室內(nèi)試驗(yàn)獲取滑體粗粒土的基本物理力學(xué)參數(shù)和應(yīng)力應(yīng)變關(guān)系,指導(dǎo)修正PFC3D進(jìn)行數(shù)值三軸試驗(yàn),得到滑體粗粒土的細(xì)觀力學(xué)參數(shù),運(yùn)用到概化出的馬家溝滑坡三維樁-土作用數(shù)值計(jì)算模型,并結(jié)合力學(xué)理論的推導(dǎo),全面系統(tǒng)的研究了典型堆積層滑坡抗滑樁土拱的形成機(jī)理及過程。 本文的主要研究內(nèi)容如下所述： (1)總結(jié)三峽庫區(qū)堆積層滑坡的基本特征和介紹庫區(qū)典型堆積層滑坡——馬家溝滑坡的工程地質(zhì)特征。 (2)從理論方面總結(jié)闡述土拱效應(yīng),研究抗滑樁中土拱效應(yīng)的實(shí)質(zhì)和土拱傳遞滑坡推力的方式；根據(jù)抗滑樁的受力特點(diǎn),利用力學(xué)理論建立抗滑樁承受矩形和三角形滑坡推力作用下樁后土拱效應(yīng)的平面力學(xué)分析模型,推導(dǎo)樁后土體應(yīng)力場的分布函數(shù),對(duì)土拱應(yīng)力的等值線分布形態(tài)進(jìn)行探討。 (3)研究馬家溝滑坡滑體粗粒土的物理力學(xué)性質(zhì),運(yùn)用PFC3D進(jìn)行粗粒土的數(shù)值三軸剪切試驗(yàn),獲取粗粒土細(xì)觀力學(xué)參數(shù)和分析剪切位移場形成發(fā)展規(guī)律。 (4)構(gòu)建顆粒流三維樁-土作用模型,從細(xì)觀力學(xué)角度分析土拱的形成和發(fā)展變化過程,研究土拱的力學(xué)傳遞機(jī)制,總結(jié)土拱形成內(nèi)部應(yīng)力變化規(guī)律,探索土拱的形成機(jī)理。 通過研究上述內(nèi)容,本文取得了以下創(chuàng)新成果： (1)改進(jìn)了矩形和三角形滑坡推力作用下抗滑樁后土體應(yīng)力場的平面分布函數(shù),對(duì)比分析了土拱應(yīng)力的等值線分布形態(tài)。 (2)研究了庫區(qū)堆積層滑坡滑體粗粒土的細(xì)觀力學(xué)性質(zhì),給出了粗粒土數(shù)值三軸剪切試驗(yàn)中剪切位移場的變化規(guī)律。 (3)研究了三維樁-土作用的細(xì)觀力學(xué)過程,分析了樁間土拱形成內(nèi)部應(yīng)力變化規(guī)律,總結(jié)出樁間土拱分布形態(tài)隨加載過程和深度改變的變化規(guī)律。
[Abstract]:The accumulation layer landslide is a basic type of landslide, the slope body composition is mostly gravel soil (coarse grained soil), the anti-slide pile is widely used in this type landslide treatment project. One of the main contents of anti-slide pile design is to determine the arrangement distance of anti-slide pile. Reasonable spacing arrangement can form soil arch and maximize the self-bearing capacity of soil between anti-slide piles. At present, the formation mechanism of soil arch in anti-slide pile remains to be further studied. Therefore, this paper has carried out the theoretical and numerical research on the formation mechanism of soil arch in anti-slide pile, analyzed the pile-soil interaction mechanism of anti-slide pile, the law of load transfer and so on. It provides technical support and reference for the design of anti-slide pile and the determination of spacing. Based on the analysis of the basic characteristics of the accumulation layer landslide, Majiagou landslide, a typical landslide in the three Gorges Reservoir area, is selected as the research object, and the basic physical and mechanical parameters and stress-strain relationship of the slider coarse grained soil are obtained through laboratory tests. The numerical triaxial test of modified PFC3D is directed to obtain the meso-mechanical parameters of coarse-grained soil of sliding body. The numerical model of three-dimensional pile-soil interaction of Majiagou landslide is applied to the generalized numerical calculation model of pile-soil interaction in Majiagou landslide, and combined with the derivation of mechanical theory. The formation mechanism and process of anti-slide pile-soil arch of typical accumulation layer landslide are studied in this paper. The main contents of this paper are as follows: (1) summarize the basic characteristics of the landslide in the three Gorges reservoir area and introduce the engineering geological characteristics of the typical landslide in the reservoir area, the Majiagou landslide. (2) summarize and expound the soil arch effect from the theoretical aspect, study the essence of soil arch effect in anti-slide pile and the way that soil arch transfers landslide thrust; According to the stress characteristics of anti-slide pile, the plane mechanics analysis model of soil arch effect of anti-slide pile under the action of rectangular and triangular landslide thrust is established by using mechanics theory, and the distribution function of soil stress field behind pile is deduced. The contour distribution of soil arch stress is discussed. (3) the physical and mechanical properties of coarse grained soil in Majiagou landslide are studied. The numerical triaxial shear test of coarse grained soil is carried out by using PFC3D, and the meso-mechanical parameters of coarse grained soil and the rules of formation and development of shear displacement field are obtained. (4) the three-dimensional pile-soil interaction model of particle flow is constructed, the formation and development process of soil arch is analyzed from the viewpoint of meso-mechanics, the mechanical transfer mechanism of soil arch is studied, the law of internal stress change of soil arch formation is summarized, and the formation mechanism of soil arch is explored. By studying the above contents, this paper has obtained the following innovative achievements: (1) the plane distribution function of soil stress field after sliding pile under the action of rectangular and triangular landslide thrust is improved. The isoline distribution of soil arch stress is compared and analyzed. (2) the mesomechanical properties of coarse grained soil of landslide in reservoir area are studied, and the variation law of shear displacement field in numerical triaxial shear test of coarse grained soil is given. (3) the meso-mechanical process of three-dimensional pile-soil interaction is studied, and the variation law of internal stress in the formation of soil arch between piles is analyzed, and the variation law of the distribution of soil arch between piles with the change of loading process and depth is summarized.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P642.22;TU473.1
本文編號(hào)：2359534
[Abstract]:The accumulation layer landslide is a basic type of landslide, the slope body composition is mostly gravel soil (coarse grained soil), the anti-slide pile is widely used in this type landslide treatment project. One of the main contents of anti-slide pile design is to determine the arrangement distance of anti-slide pile. Reasonable spacing arrangement can form soil arch and maximize the self-bearing capacity of soil between anti-slide piles. At present, the formation mechanism of soil arch in anti-slide pile remains to be further studied. Therefore, this paper has carried out the theoretical and numerical research on the formation mechanism of soil arch in anti-slide pile, analyzed the pile-soil interaction mechanism of anti-slide pile, the law of load transfer and so on. It provides technical support and reference for the design of anti-slide pile and the determination of spacing. Based on the analysis of the basic characteristics of the accumulation layer landslide, Majiagou landslide, a typical landslide in the three Gorges Reservoir area, is selected as the research object, and the basic physical and mechanical parameters and stress-strain relationship of the slider coarse grained soil are obtained through laboratory tests. The numerical triaxial test of modified PFC3D is directed to obtain the meso-mechanical parameters of coarse-grained soil of sliding body. The numerical model of three-dimensional pile-soil interaction of Majiagou landslide is applied to the generalized numerical calculation model of pile-soil interaction in Majiagou landslide, and combined with the derivation of mechanical theory. The formation mechanism and process of anti-slide pile-soil arch of typical accumulation layer landslide are studied in this paper. The main contents of this paper are as follows: (1) summarize the basic characteristics of the landslide in the three Gorges reservoir area and introduce the engineering geological characteristics of the typical landslide in the reservoir area, the Majiagou landslide. (2) summarize and expound the soil arch effect from the theoretical aspect, study the essence of soil arch effect in anti-slide pile and the way that soil arch transfers landslide thrust; According to the stress characteristics of anti-slide pile, the plane mechanics analysis model of soil arch effect of anti-slide pile under the action of rectangular and triangular landslide thrust is established by using mechanics theory, and the distribution function of soil stress field behind pile is deduced. The contour distribution of soil arch stress is discussed. (3) the physical and mechanical properties of coarse grained soil in Majiagou landslide are studied. The numerical triaxial shear test of coarse grained soil is carried out by using PFC3D, and the meso-mechanical parameters of coarse grained soil and the rules of formation and development of shear displacement field are obtained. (4) the three-dimensional pile-soil interaction model of particle flow is constructed, the formation and development process of soil arch is analyzed from the viewpoint of meso-mechanics, the mechanical transfer mechanism of soil arch is studied, the law of internal stress change of soil arch formation is summarized, and the formation mechanism of soil arch is explored. By studying the above contents, this paper has obtained the following innovative achievements: (1) the plane distribution function of soil stress field after sliding pile under the action of rectangular and triangular landslide thrust is improved. The isoline distribution of soil arch stress is compared and analyzed. (2) the mesomechanical properties of coarse grained soil of landslide in reservoir area are studied, and the variation law of shear displacement field in numerical triaxial shear test of coarse grained soil is given. (3) the meso-mechanical process of three-dimensional pile-soil interaction is studied, and the variation law of internal stress in the formation of soil arch between piles is analyzed, and the variation law of the distribution of soil arch between piles with the change of loading process and depth is summarized.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P642.22;TU473.1
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