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1、河海大學(xué)碩士學(xué)位論文降雨入滲條件下土質(zhì)邊坡穩(wěn)定性分析姓名:楊志剛申請學(xué)位級別:碩士專業(yè):地質(zhì)工程指導(dǎo)教師:劉建剛20070501摘要近年來,降雨所導(dǎo)致的邊坡失穩(wěn)越來越頻繁,引起了越來越多專家學(xué)者的重視。本文運(yùn)用飽和一非飽和滲流理論及降雨入滲理論,分析不同降雨條件下土坡內(nèi)滲流場的變化,根據(jù)計(jì)算出來的瞬態(tài)滲流場利用非飽和土抗剪強(qiáng)度理論,對土坡的瞬態(tài)穩(wěn)定性進(jìn)行分析。研究的主要內(nèi)容有:在飽和滲流控制方程基礎(chǔ)上推導(dǎo)出飽和一非飽和滲流控制方程,給出了降雨條件下的邊界條件。推導(dǎo)降雨條件下飽和一非飽和滲流有限元Gal
2、erkin解。用非飽和土抗剪強(qiáng)度理論對極限平衡條分法進(jìn)行改進(jìn),建立適合飽和一非飽和土質(zhì)邊坡的穩(wěn)定分析的改進(jìn)條分法。結(jié)合重慶市云陽縣人和鎮(zhèn)木古村l組居民點(diǎn)處一土質(zhì)邊坡,運(yùn)用有限元模擬計(jì)算不同降雨條件下坡體內(nèi)的瞬態(tài)滲流場,得到相應(yīng)的瞬念孔隙水壓力分布圖。運(yùn)用非飽和土抗剪強(qiáng)度理論,結(jié)合之前得到的孔隙水壓力進(jìn)行土坡穩(wěn)定性分析,計(jì)算出不同降雨條件下土坡的瞬態(tài)穩(wěn)定系數(shù)。降雨強(qiáng)度、降雨持時、降雨雨型、前期降雨和初始孔隙水壓力分布對邊坡穩(wěn)定性都有著或大或小的影響。關(guān)鍵詞:降雨入滲、邊坡穩(wěn)定、飽和一非飽和滲流、孔隙水壓
3、力、有限元、非穩(wěn)定滲流AbstraetAbstractInrecentyears,theslopefailurecausedbyrainfallinfiltrationmoreandmorefrequently,andmoreandmoreexpertsattachimportancetothissubject.Thispaperanalyzedthechangeofseepage-fieldinthesoilslopeonthedifferentconditionsofrainfallinfiltr
4、ationonthesaturated—unsaturatedseepagetheoryandrainfallinfiltrationtheory.Anditanalyzedthesoilslopetransientstabilitybasedonthetransientseepage—fieldwhichiscalculatedontheshearstrengththeoryofunsaturatedsoil.111efollowingisincluded:Saturated—unsaturated
5、seepagetheoryontheconditionofrainfallinfiltrationisintroduced,andthecontrolequationofunsaturatedseepageisalsointroduced,andboundaryconditionsaregivenontheconditionofrainfallinfiltration.nededucingprocessoffinite-elementcontrolequationofsaturated-unsatur
6、atedseepageispresented.Thesoil—slopestabilitymechanismundertheinfluenceofrainfallinfiltrationisexpatiatedcompendiously.Thesoilslopein1GroupGumuvillageofRenhetowninYunyangcityofChongqingisanalyzedasallexample.nletransientseepage—fieldiscalculatedbyfinite
7、-elementsimulationmethod,andthecorrespondingdistributingdrawingsoftransientpore·waterpressureareobtained.Then,basedontheshearstrengththeoryofunsaturatedsoilandpore·waterpressurewhichisobtainedabove,thepaperanalyzedthestabilityofsoilslope,andcalculatedth
8、etransientsafetyfactorsondifferentconditionsofrainfallinfiltration.Keywords:raininfiltration,slopstability,saturated—unsaturatedseepage,porewaterpressure,F(xiàn)EM,unsteadyseepage學(xué)位論文獨(dú)創(chuàng)性聲明:本人所呈交的學(xué)位論文是我個人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知,除了文中特