【摘要】：基于鄂北調(diào)水工程109+620—109+800段典型膨脹土渠道滑坡現(xiàn)場調(diào)研資料與試驗(yàn)數(shù)據(jù),從裂隙、大氣降雨、施工及防護(hù)措施等方面對膨脹土渠道滑坡原因進(jìn)行了探討,研究了膨脹土滑坡的破壞機(jī)理,同時(shí)采用剛體極限平衡法(M-P法)對優(yōu)化設(shè)計(jì)施工前后的邊坡抗滑穩(wěn)定安全系數(shù)進(jìn)行了模擬分析驗(yàn)證。結(jié)果表明:該膨脹土渠道滑坡主要受土體裂隙控制,雨水的劈裂作用起到連通貫穿裂隙的作用;上部弱膨脹土在大氣降雨影響下發(fā)育陡傾角裂隙,往往形成滑坡體后緣下挫變形;坡腳及基底中等膨脹土發(fā)育無規(guī)則緩傾角長大裂隙,為邊坡滑動(dòng)提供軟弱滑動(dòng)面或滑動(dòng)帶,形成滑坡前緣;久強(qiáng)降雨軟化邊坡表層土體,降低其強(qiáng)度,同時(shí)雨水進(jìn)入裂隙中對土體起到破裂作用;多次干濕循環(huán)貫通土體各向異性裂隙,生成深層軟弱滑動(dòng)面或滑動(dòng)帶;施工不當(dāng)與防護(hù)措施不足是導(dǎo)致此次膨脹土滑坡的人為因素。為保障工程后期膨脹土邊坡穩(wěn)定,應(yīng)遵循快速施工、地質(zhì)預(yù)測、動(dòng)態(tài)設(shè)計(jì)、及時(shí)封閉、盡早回填的原則,選擇合理邊坡坡比,建設(shè)有效排水系統(tǒng)并硬化順延覆蓋一級(jí)邊坡,對邊坡垮塌或滑動(dòng)進(jìn)行實(shí)時(shí)監(jiān)控量測。
[Abstract]:Based on the field investigation data and test data of typical expansive soil channel landslide in 109620-109,800 section of water transfer project in northern Hubei, the causes of expansive soil channel landslide are discussed from the aspects of cracks, atmospheric rainfall, construction and protection measures, etc. The failure mechanism of expansive soil landslide is studied, and the stability safety factor of slope before and after optimization design and construction is simulated and verified by rigid body limit equilibrium method (M-P method). The results show that the landslide of the expansive soil channel is mainly controlled by the soil fissures, and Rain Water's cleavage plays the role of connecting through the fissures. Under the influence of atmospheric rainfall, the upper weakly expansive soil develops steep dipping fissures, which often result in the collapse and deformation of the back edge of the landslide body. At the foot of the slope and the medium expansive soil of the basement, the long cracks with irregular slowly inclined angle are developed, which provide the weak sliding surface or the slip zone for the slope slide, and form the landslide front edge. The surface soil of the slope is softened by heavy rainfall and its strength is reduced, at the same time Rain Water enters into the fissure to break the soil, and dry-wet circulation penetrates through the anisotropic fracture of the soil for many times, forming deep weak sliding surface or sliding zone. Improper construction and inadequate protective measures are the human factors leading to the expansive soil landslide. In order to ensure the stability of expansive soil slope in the later stage of engineering, we should follow the principles of rapid construction, geological prediction, dynamic design, timely closure and early backfilling, select a reasonable slope ratio, build an effective drainage system and harden and cover the first grade slope. Real-time monitoring and measurement of slope collapse or slippage.
【作者單位】： 湖北省水利水電規(guī)劃勘測設(shè)計(jì)院;
【分類號(hào)】：TV698

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