深基坑邊坡穩(wěn)定性計(jì)算書模板

./r/nPAGE/r/n./r/n專業(yè)資料/r/n學(xué)習(xí)資料/r/n土坡穩(wěn)定性計(jì)算書/r/n本計(jì)算書參照《建筑施工計(jì)算手冊(cè)》江正榮編著中國(guó)建筑工業(yè)出版社、《實(shí)用土木工程手冊(cè)》第三版楊文淵編著人民教同出版社、《地基與基礎(chǔ)》第三版中國(guó)建筑工業(yè)出版社、《土力學(xué)》等相關(guān)文獻(xiàn)進(jìn)行編制。/r/n計(jì)算土坡穩(wěn)定性采用圓弧條分法進(jìn)行分析計(jì)算,由于該計(jì)算過程是大量的重復(fù)計(jì)算,故本計(jì)算書只列出相應(yīng)的計(jì)算公式和計(jì)算結(jié)果,省略了重復(fù)計(jì)算過程。/r/n本計(jì)算書采用瑞典條分法進(jìn)行分析計(jì)算,假定滑動(dòng)面為圓柱面及滑動(dòng)土體為不變形剛體,還假定不考慮土條兩側(cè)上的作用力。/r/n一、參數(shù)信息/r/n:/r/n條分方法：瑞典條分法；/r/n考慮地下水位影響；/r/n基坑外側(cè)水位到坑頂?shù)木嚯x/r/n<m>/r/n：/r/n1.56/r/n；/r/n基坑內(nèi)側(cè)水位到坑頂?shù)木嚯x/r/n<m>/r/n：/r/n14.000/r/n；/r/n放坡參數(shù)：/r/n序號(hào)放坡高度/r/n<m>/r/n放坡寬度/r/n<m>/r/n平臺(tái)寬度/r/n<m>/r/n條分塊數(shù)/r/n03./r/n5/r/n03./r/n5/r/n0/r/n2.000.00/r/n1/r/n4.504.50/r/n3.000.00/r/n2/r/n6.206.20/r/n3.000.00/r/n荷載參數(shù)：/r/n序號(hào)/r/n類型/r/n面荷載q<kPa>/r/n基坑邊線距離〔m/r/n寬度〔m/r/n1/r/n滿布/r/n10.00/r/n0.00/r/n0.00/r/n土層參數(shù)：/r/n序號(hào)/r/n土名稱/r/n土厚度/r/n〔m/r/n坑壁土的重/r/n度/r/nγ<kN/m/r/n3/r/n>/r/n坑壁土的內(nèi)摩擦角/r/nφ<°>/r/n粘聚力/r/n〔kPa/r/n飽容重/r/n<kN/m/r/n3/r/n>/r/n1/r/n粉質(zhì)粘土/r/n1/r/n5/r/n20.5/r/n10/r/n10/r/n20.5/r/n二、計(jì)算原理/r/n:/r/n根據(jù)土坡極限平衡穩(wěn)定進(jìn)行計(jì)算。自然界勻質(zhì)土坡失去穩(wěn)定,滑動(dòng)面呈曲面,通?；瑒?dòng)面接近圓弧,可將滑裂面近似成圓弧計(jì)算。將土坡的土體沿豎直方向分成若干個(gè)土條,從土條中任意取出第/r/ni/r/n條,不考慮其側(cè)面上的作用力時(shí),該土條上存在著：/r/n1/r/n、土條自重,/r/n2/r/n、作用于土條弧面上的法向反力,/r/n3/r/n、作用于土條圓弧面上的切向阻力。/r/n將抗剪強(qiáng)度引起的極限抗滑力矩和滑動(dòng)力矩的比值作為安全系數(shù),考慮安全儲(chǔ)備的大小,按照《規(guī)范》要求,安全系數(shù)要滿足/r/n>=1.3/r/n的要求。/r/n將抗剪強(qiáng)度引起的極限抗滑力矩和滑動(dòng)力矩的比值作為安全系數(shù),考慮安全儲(chǔ)備的大小,按照《規(guī)范》要求,安全系數(shù)要滿足/r/n>=1.3/r/n的要求。/r/n三、計(jì)算公式/r/n:/r/n式子中：/r/nF/r/ns/r/n--/r/n土坡穩(wěn)定安全系數(shù)；/r/nc--/r/n土層的粘聚力；/r/nl/r/ni/r/n--/r/n第/r/ni/r/n條土條的圓弧長(zhǎng)度；/r/nγ--/r/n土層的計(jì)算重度；/r/nθ/r/ni/r/n--/r/n第/r/ni/r/n條土到滑動(dòng)圓弧圓心與豎直方向的夾角；/r/nφ--/r/n土層的內(nèi)摩擦角；/r/nb/r/ni/r/n--/r/n第/r/ni/r/n條土的寬度；/r/nh/r/ni/r/n--/r/n第/r/ni/r/n條土的平均高度/r/n；/r/nh/r/n1i/r/n――/r/n第/r/ni/r/n條土水位以上的高度；/r/nh/r/n2i/r/n――/r/n第/r/ni/r/n條土水位以下的高度；/r/nγ'/r/n――/r/n第/r/ni/r/n條土的平均重度的浮重度；/r/nq /r/n――/r/n第/r/ni/r/n條土條土上的均布荷載；/r/n其中,根據(jù)幾何關(guān)系,求得/r/nh/r/ni/r/n為：/r/n式子中：/r/nr--/r/n土坡滑動(dòng)圓弧的半徑；/r/nl/r/n0/r/n--/r/n坡角距圓心垂線與坡角地坪線交點(diǎn)長(zhǎng)度；/r/nα/r/n土坡與水平面的夾角；/r/nh/r/n1/r/ni/r/n的計(jì)算公式/r/n當(dāng)/r/nh/r/n1/r/ni/r/n≥/r/nh/r/ni/r/n時(shí),取/r/nh/r/n1i/r/n=h/r/ni/r/n；/r/n當(dāng)/r/nh/r/n1/r/ni/r/n≤/r/n0/r/n時(shí),取/r/nh/r/n1i/r/n=0/r/n；/r/nh/r/n2i/r/n的計(jì)算公式：/r/nh/r/n2i/r/n=h/r/ni/r/n-h/r/n1i/r/n；/r/nh/r/nw/r/n――/r/n土坡外地下水位深度/r/n；/r/nl/r/ni/r/n的幾何關(guān)系為：/r/n四、計(jì)算安全系數(shù)/r/n:/r/n將數(shù)據(jù)各參數(shù)代入上面的公式,通過循環(huán)計(jì)算,求得最小的安全系數(shù)/r/nFs/r/n：/r/n計(jì)算步數(shù)安全系數(shù)滑裂角/r/n</r/n度/r/n>/r/n圓心/r/nX<m>/r/n圓心/r/nY<m>/r/n半徑/r/nR<m>/r/n第/r/n1/r/n步/r/n1.39145.259-0.0388.4498.449/r/n示意圖如下：/r/n計(jì)算步數(shù)安全系數(shù)滑裂角/r/n</r/n度/r/n>/r/n圓心/r/nX<m>/r/n圓心/r/nY<m>/r/n半徑/r/nR<m>/r/n第/r/n2/r/n步/r/n1.32152.516-0.02818.94718.947/r/n示意圖如下：/r/n計(jì)算步數(shù)安全系數(shù)滑裂角/r/n</r/n度/r/n>/r/n圓心/r/nX<m>/r/n圓心/r/nY<m>/r/n半徑/r/nR<m>/r/n第/r/n3/r/n步/r/n1.32555.0110.27926.29626.298/r/n示意圖如下：/r/n計(jì)算結(jié)論如下：/r/n第/r/n1/r/n步開挖內(nèi)部整體穩(wěn)定性安全系數(shù)/r/nFs=1.391>1.30/r/n滿足要求/r/n![/r/n標(biāo)高/r/n-5.000m/r/n]/r/n第/r/n2/r/n步開挖內(nèi)部整體穩(wěn)定性安全系數(shù)/r/nFs=1.321>1.30/r/n滿足要求/r/n![/r/n標(biāo)高/r/n-10.000m/r/n]/r/n第/r/n3/r/n步開挖內(nèi)部整體穩(wěn)定性安全系數(shù)/r/nFs=1.325>1.30/r/n滿足要求/r/n![/r/n標(biāo)高/r/n-13.000m/r/n]/r/n附件二/r/n集水明排/r/n降水計(jì)算書/r/n集水明排/r/n降水計(jì)算書/r/n1、基坑涌水量計(jì)算：/r/n均質(zhì)含水層潛水完整井基坑涌水量計(jì)算/r/n基坑遠(yuǎn)離地面水源時(shí)/r/n式中/r/nQ/r/n——/r/n基坑涌水量；/r/nK/r/n——/r/n土壤的滲透系數(shù)〔取k=20m/d；/r/nH/r/n——/r/n潛水含水層厚度；/r/nS/r/n——/r/n基坑水位降深；/r/nR/r/n——/r/n降水影響半徑；宜通過試驗(yàn)或根據(jù)當(dāng)?shù)亟?jīng)驗(yàn)確定,當(dāng)基坑安全等級(jí)為二、三級(jí)時(shí),對(duì)潛水含水層按下式計(jì)算：/r/nk/r/n——/r/n土的滲透系數(shù)；/r/nr/r/n0/r/n——/r/n基坑等效半徑；當(dāng)基坑為圓形時(shí),基坑等效半徑取圓半徑。/r/n本工程基坑等效半徑/r/nr/r/n0/r/n=/r/n54/r/nm,基坑深1/r/n4/r/nm/r/n,水位降深12.5/r/nm,/r/n潛水含水層厚12.5m。/r/n經(jīng)計(jì)算降水影響半徑R=/r/n395/r/nm,基坑涌水量/r/nQ=/r/n4/r/n640/r/nm/r/n3/r/n/d。/r/n2、/r/n抽水泵數(shù)量/r/n式中/r/nQ/r/n——/r/n基坑總涌水量；/r/nq/r/n——/r/n單/r/n泵/r/n出水量/r/n本工程/r/n采用的/r/nφ/r/n150mm潛水泵出水量/r/nq/r/n≈/r/n2400/r/nm/r/n3/r/n/d/r/n。經(jīng)計(jì)算n/r/n≥/r/