四川宣漢桐子園滑坡變形破壞機(jī)制及穩(wěn)定性研究
發(fā)布時(shí)間：2018-10-04 21:00
【摘要】：桐子園滑坡形成于緩傾角(10°-20°)的砂泥巖互層的紅層地層。通常認(rèn)為緩傾角紅層滑坡由重力提供的下滑力很小,僅靠重力作用很難形成滑坡,其形成原因與紅層的特殊性質(zhì)和強(qiáng)降雨是密不可分的。紅層滑坡廣泛的分布在四川盆地,對人民生命財(cái)產(chǎn)安全構(gòu)成極大威脅。因此,對桐子園滑坡的研究進(jìn)一步揭示了紅層滑坡的成因機(jī)制,對防災(zāi)減災(zāi)具有重要意義。本文以四川宣漢桐子園滑坡為研究對象,根據(jù)實(shí)地調(diào)查、現(xiàn)場試驗(yàn)、室內(nèi)試驗(yàn),通過地質(zhì)理論分析、數(shù)值模擬計(jì)算對桐子園滑坡進(jìn)行了全方位的研究。本文主要研究成果如下:(1)詳盡描述了滑坡的規(guī)模、邊界、滑坡物質(zhì)組成、變形破壞特征。根據(jù)滑坡的邊界、變形破壞特征、破壞程度、裂縫分布特點(diǎn),將滑坡劃分為四個(gè)區(qū)域:拉陷變形區(qū)、強(qiáng)變形區(qū)、弱變形區(qū)、超覆區(qū)。(2)從地質(zhì)條件影響因素和降雨影響因素分析了桐子園滑坡的成因機(jī)制,認(rèn)為降雨是誘發(fā)桐子園滑坡的最主要因素,滑坡形成過程可分為四個(gè)階段:降雨入滲裂隙發(fā)展軟弱帶抗剪強(qiáng)度降低,揚(yáng)壓力產(chǎn)生孔隙水壓力、揚(yáng)壓力上升失穩(wěn)滑動(dòng)。通過恢復(fù)桐子園滑坡的原地貌,用離散元軟件UDEC模擬了桐子園滑坡在不同工況下的變形特征。結(jié)果表明,桐子園滑坡只有在后緣高孔隙水壓力、沿軟弱帶揚(yáng)壓力、軟弱帶抗剪強(qiáng)度降低的共同作用下才會(huì)發(fā)生滑動(dòng)。(3)用極限平衡法計(jì)算了桐子園滑坡在天然、暴雨、地震、暴雨+地震工況下的穩(wěn)定性。結(jié)果表明:天然工況下滑坡是穩(wěn)定的;地震工況下滑坡穩(wěn)定性有所降低,滑坡處于基本穩(wěn)定~穩(wěn)定狀態(tài);暴雨對滑坡穩(wěn)定性影響較大,滑坡處于基本穩(wěn)定狀態(tài);地震+暴雨的極限工況下滑坡失穩(wěn)。(4)用單因素分析法分析了粘聚力c、內(nèi)摩擦角?、地震加速度a對桐子園滑坡穩(wěn)定性的影響,分析結(jié)果表明內(nèi)摩擦角?對桐子園滑坡穩(wěn)定性影響最大。(5)運(yùn)用有限差分法數(shù)值模擬軟件FLAC3D對桐子園滑坡在天然、暴雨、地震、暴雨+地震四種工況下的穩(wěn)定性進(jìn)行了分析。分析結(jié)果表明:天然工況下的各項(xiàng)特征均表明滑坡沒有變形破壞跡象,滑坡處于穩(wěn)定狀態(tài);滑坡在暴雨工況下的最大位移為5.2cm,局部形成了貫通的塑性變形區(qū),未形成剪應(yīng)變增量貫通帶,說明滑坡整體是穩(wěn)定的,局部可能發(fā)生變形破壞�；略诘卣鸸r下,最大位移為3.6cm,未形成貫通的塑性變形區(qū),未形成剪應(yīng)變增量貫通帶,說明滑坡是穩(wěn)定的。地震+暴雨工況下滑坡出現(xiàn)明顯變形破壞特征,最大位移量為59cm,坡體發(fā)生大規(guī)模塑性變形破壞,形成了貫通的塑性變形區(qū),中前部形成了剪應(yīng)變增量貫通帶。(6)根據(jù)桐子園滑坡的變形特征、影響因素、成因機(jī)制、穩(wěn)定性狀況提出了“削方減載+拉陷槽回填+裂縫封閉+地表排水工程”的治理措施。
[Abstract]:Tongziyuan landslide is formed in the red stratum of sand and mudstone interbedded with gentle dip angle (10 擄-20 擄). It is generally considered that the sliding force provided by gravity is very small, and it is difficult to form landslide by gravity alone, which is closely related to the special properties of red beds and heavy rainfall. Red-bed landslide is widely distributed in Sichuan Basin, which poses a great threat to the safety of people's life and property. Therefore, the study of Tongziyuan landslide further reveals the formation mechanism of red bed landslide, which is of great significance for disaster prevention and mitigation. In this paper, Tongziyuan landslide in Xuanghan County, Sichuan Province is taken as the research object. According to field investigation, field test, laboratory test, geological theory analysis and numerical simulation calculation, Tongziyuan landslide is studied in all directions. The main results of this paper are as follows: (1) the scale, boundary, material composition, deformation and failure characteristics of landslide are described in detail. According to the boundary of the landslide, the characteristics of deformation and failure, the degree of failure and the distribution of cracks, the landslide is divided into four regions: drawing deformation area, strong deformation area, weak deformation area, and so on. (2) the cause mechanism of Tongziyuan landslide is analyzed from the factors of geological condition and rainfall, and it is considered that rainfall is the main factor that induces Tongziyuan landslide. The forming process of landslide can be divided into four stages: the shear strength of the weak zone developed by rainfall infiltration fissures decreases, the uplift pressure produces pore water pressure, and the uplift pressure rises and loses stability and slips. By restoring the original landform of Tongziyuan landslide, the deformation characteristics of Tongziyuan landslide under different working conditions were simulated by discrete element software UDEC. The results show that the Tongziyuan landslide will slip only under the combined action of high pore water pressure in the rear edge, uplifting pressure along the weak zone and decreasing shear strength of the weak zone. (3) the Tongziyuan landslide in natural, torrential rain and earthquake is calculated by using the limit equilibrium method. Stability of torrential rain under earthquake conditions. The results show that the landslide is stable under natural working conditions, the landslide stability is reduced under earthquake condition, the landslide is in the basic stable state, the rainstorm has a great influence on the landslide stability, and the landslide is in the basic stable state. The landslide is unstable under the limit condition of earthquake rainstorm. (4) the cohesive force c and the angle of internal friction are analyzed by single factor analysis. , the effect of seismic acceleration a on the stability of Tongziyuan landslide. The results show that the internal friction angle? The stability of Tongziyuan landslide is the most important. (5) the stability of Tongziyuan landslide under natural, rainstorm, earthquake and rainstorm conditions is analyzed by using finite difference numerical simulation software FLAC3D. The results show that the landslide has no signs of deformation and failure and is in a stable state, and the maximum displacement of landslide is 5.2 cm under the condition of heavy rain, and a through plastic deformation zone is formed locally. The failure of shear strain increment through zone indicates that the whole landslide is stable and local deformation and failure may occur. Under seismic conditions, the maximum displacement of landslide is 3.6 cm, the plastic deformation zone is not formed and the shear strain increment through zone is not formed, which indicates that the landslide is stable. Under the condition of earthquake rainstorm, the landslide appears obvious deformation and failure characteristics, the maximum displacement is 59 cm, and the slope body has large-scale plastic deformation and failure, forming a through plastic deformation zone. According to the deformation characteristics of Tongziyuan landslide, influencing factors, forming mechanism and stability condition, the paper puts forward the treatment measures of "sealing surface drainage project with backfill crack of reducing load and draining trough of cutting square". (6) according to the deformation characteristics of Tongziyuan landslide, the influence factors, the cause mechanism and the stability condition are put forward.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.22
本文編號(hào)：2251862
[Abstract]:Tongziyuan landslide is formed in the red stratum of sand and mudstone interbedded with gentle dip angle (10 擄-20 擄). It is generally considered that the sliding force provided by gravity is very small, and it is difficult to form landslide by gravity alone, which is closely related to the special properties of red beds and heavy rainfall. Red-bed landslide is widely distributed in Sichuan Basin, which poses a great threat to the safety of people's life and property. Therefore, the study of Tongziyuan landslide further reveals the formation mechanism of red bed landslide, which is of great significance for disaster prevention and mitigation. In this paper, Tongziyuan landslide in Xuanghan County, Sichuan Province is taken as the research object. According to field investigation, field test, laboratory test, geological theory analysis and numerical simulation calculation, Tongziyuan landslide is studied in all directions. The main results of this paper are as follows: (1) the scale, boundary, material composition, deformation and failure characteristics of landslide are described in detail. According to the boundary of the landslide, the characteristics of deformation and failure, the degree of failure and the distribution of cracks, the landslide is divided into four regions: drawing deformation area, strong deformation area, weak deformation area, and so on. (2) the cause mechanism of Tongziyuan landslide is analyzed from the factors of geological condition and rainfall, and it is considered that rainfall is the main factor that induces Tongziyuan landslide. The forming process of landslide can be divided into four stages: the shear strength of the weak zone developed by rainfall infiltration fissures decreases, the uplift pressure produces pore water pressure, and the uplift pressure rises and loses stability and slips. By restoring the original landform of Tongziyuan landslide, the deformation characteristics of Tongziyuan landslide under different working conditions were simulated by discrete element software UDEC. The results show that the Tongziyuan landslide will slip only under the combined action of high pore water pressure in the rear edge, uplifting pressure along the weak zone and decreasing shear strength of the weak zone. (3) the Tongziyuan landslide in natural, torrential rain and earthquake is calculated by using the limit equilibrium method. Stability of torrential rain under earthquake conditions. The results show that the landslide is stable under natural working conditions, the landslide stability is reduced under earthquake condition, the landslide is in the basic stable state, the rainstorm has a great influence on the landslide stability, and the landslide is in the basic stable state. The landslide is unstable under the limit condition of earthquake rainstorm. (4) the cohesive force c and the angle of internal friction are analyzed by single factor analysis. , the effect of seismic acceleration a on the stability of Tongziyuan landslide. The results show that the internal friction angle? The stability of Tongziyuan landslide is the most important. (5) the stability of Tongziyuan landslide under natural, rainstorm, earthquake and rainstorm conditions is analyzed by using finite difference numerical simulation software FLAC3D. The results show that the landslide has no signs of deformation and failure and is in a stable state, and the maximum displacement of landslide is 5.2 cm under the condition of heavy rain, and a through plastic deformation zone is formed locally. The failure of shear strain increment through zone indicates that the whole landslide is stable and local deformation and failure may occur. Under seismic conditions, the maximum displacement of landslide is 3.6 cm, the plastic deformation zone is not formed and the shear strain increment through zone is not formed, which indicates that the landslide is stable. Under the condition of earthquake rainstorm, the landslide appears obvious deformation and failure characteristics, the maximum displacement is 59 cm, and the slope body has large-scale plastic deformation and failure, forming a through plastic deformation zone. According to the deformation characteristics of Tongziyuan landslide, influencing factors, forming mechanism and stability condition, the paper puts forward the treatment measures of "sealing surface drainage project with backfill crack of reducing load and draining trough of cutting square". (6) according to the deformation characteristics of Tongziyuan landslide, the influence factors, the cause mechanism and the stability condition are put forward.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.22
【引證文獻(xiàn)】
相關(guān)會(huì)議論文 前1條
1 簡文星;王志儉;殷坤龍;;三峽庫區(qū)萬州緩傾角紅層基巖滑坡啟滑機(jī)制[A];和諧地球上的水工巖石力學(xué)——第三屆全國水工巖石力學(xué)學(xué)術(shù)會(huì)議論文集[C];2010年
，本文編號(hào)：2251862
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