【摘要】：膨脹土邊坡失穩(wěn)問題已經(jīng)成為膨脹土地區(qū)的一個主要工程地質(zhì)難題,引起了越來越多專家學(xué)者的關(guān)注,國內(nèi)外學(xué)者對非飽和膨脹土邊坡已經(jīng)做了大量研究。現(xiàn)有研究普遍認(rèn)為膨脹土邊坡的安全系數(shù)隨降雨的發(fā)展不斷降低,而在鎮(zhèn)江地區(qū),大量的工程實踐表明在降雨初期,隨著降雨量的增大,邊坡的安全系數(shù)有一個增大的過程,降雨量進(jìn)一步增大,邊坡安全系數(shù)逐漸減小。本文即通過室內(nèi)試驗、FLAC軟件分析,研究鎮(zhèn)江地區(qū)膨脹土邊坡在降雨初期其安全系數(shù)的變化規(guī)律及其機(jī)理,得到邊坡在降雨初期的穩(wěn)定安全時間,為本地區(qū)的邊坡地質(zhì)災(zāi)害預(yù)警預(yù)報提供參考。本文主要研究內(nèi)容如下:(1)通過室內(nèi)試驗:得到了膨脹土的抗剪強(qiáng)度與含水率的關(guān)系,即隨含水率的增加抗剪強(qiáng)度呈先增加后減小的趨勢。(2)通過對降雨入滲下的膨脹土邊坡的穩(wěn)定性進(jìn)行數(shù)值模擬分析,發(fā)現(xiàn)了膨脹土邊坡在降雨入滲條件下,邊坡安全系數(shù)會有短暫增加的現(xiàn)象;(3)針對鎮(zhèn)江地區(qū)在長時弱降雨和短時強(qiáng)降雨的降水特征,通過模擬分析,指出了膨脹土邊坡發(fā)生失穩(wěn)破壞的安全時間。
[Abstract]:The instability of expansive soil slope has become a major engineering geological problem in expansive soil area, which has attracted more and more attention of experts and scholars, and scholars at home and abroad have done a lot of research on unsaturated expansive soil slope. It is generally believed that the safety factor of expansive soil slope decreases with the development of rainfall. However, in Zhenjiang area, a large number of engineering practices show that the safety factor of expansive soil slope increases with the increase of rainfall at the beginning of rainfall. With the increase of rainfall, the slope safety factor decreases gradually. In this paper, through the analysis of FLAC software in laboratory test, the variation law and mechanism of the safety factor of expansive soil slope in Zhenjiang area at the beginning of rainfall are studied, and the stable and safe time of slope in the early stage of rainfall is obtained. It provides a reference for the early warning and forecast of slope geological hazard in this area. The main contents of this paper are as follows: (1) through laboratory tests, the relationship between shear strength and moisture content of expansive soil is obtained. That is, the shear strength increases first and then decreases with the increase of moisture content. (2) through the numerical simulation analysis of the stability of expansive soil slope under rainfall infiltration, it is found that the expansive soil slope under rainfall infiltration condition, The slope safety factor will increase temporarily. (3) according to the precipitation characteristics of long term weak rainfall and short term strong rainfall in Zhenjiang area, the safe time of instability and failure of expansive soil slope is pointed out by simulation analysis.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43

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本文編號：2126249