邊坡穩(wěn)定性分析

1、二. 邊坡穩(wěn)定性設(shè)計(jì)初始條件：路線經(jīng)過(guò)區(qū)域路基填土為粘土，邊坡為梯形邊坡，分兩級(jí)，土力學(xué)的指標(biāo)：塑限14%，液限27%，含水量19%，天然容重18KN/m3，粘聚力19KPa，內(nèi)摩擦角27，公路按一級(jí)公路標(biāo)準(zhǔn)，雙向四車道，設(shè)計(jì)車速為80Km/h，路基寬度為24.5m，荷載為車輛重力標(biāo)準(zhǔn)值550KN，中間護(hù)坡道取2m，車道寬度3.75m，硬路肩2.5m，土路肩0.75m，進(jìn)行最不利布載時(shí)對(duì)左右各布3輛車。 H=16m ,H=26m,I1取值1：1.25 , I2取值1：1.25 1.計(jì)算參數(shù):2.荷載換算成等效土柱高度荷載橫向分布寬度:,由于是雙向四車道,進(jìn)行最不利分布時(shí)左右各分布3輛車,故N=

2、6,后輪輪距b=1.8m，相鄰兩車后輪的中心間距b=1.3m,輪胎著地寬度d=0.6m,則B=61.8+51.3+0.6=17.9m。前后輪最大軸距按照公路工程技術(shù)標(biāo)準(zhǔn)規(guī)定對(duì)于標(biāo)準(zhǔn)車輛荷載為L(zhǎng)=12.8m行車荷載換算高度=0.8m3.按照4.5H法確定滑動(dòng)圓心輔助線邊坡的平均坡度i=12/(621.25+2)=12;171:1.4,則的值分別為和，然后繪制5個(gè)不同的滑動(dòng)面，將每個(gè)滑動(dòng)面的土體均分為8個(gè)土條，通過(guò)Atuo CAD的massprop命令找出每個(gè)土條的形心的位置和每個(gè)土條的面積S及每個(gè)圓弧長(zhǎng)L,連接圓心和每個(gè)土條的形心并延長(zhǎng)圓弧相交于點(diǎn)（以圓心為坐標(biāo)原點(diǎn)），土條中心與圓心的連線與豎直

3、方向的夾角，則穩(wěn)定系數(shù)，通過(guò)計(jì)算可得每個(gè)滑動(dòng)面的穩(wěn)定系數(shù)。 比例尺是1:50。第一個(gè)滑動(dòng)面如圖：分段 正弦 余弦面積(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.3620.9328.49152.86142.47-55.4036.272-0.2030.97923.46422.30413.51-85.743-0.0350.99931.95575.14574.80-199.9240.1520.98839.966719.39711.08109.0350.3300.94447.74859.23810.96283.960.5060.86345.5820.48707.874

4、14.8570.6830.73135.37636.57465.10434.6380.8470.53117.66317.81168.88269.23K的大小2.33第二個(gè)滑動(dòng)面如下圖：分段 正弦 余弦面積(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.2120.9775.733103.19100.84-21.9232.662-0.0750.99716.06289.31288.31-21.7030.0730.99722.58406.39405.3129.6840.2300.97326.38474.87462.10109.3650.3840.92331.50566.9

5、1523.45217.6860.5350.84533.80608.32513.88325.5570.6870.72625.99467.80339.84321.4780.8290.55912.54225.63126.13187.09K的大小1.77第三個(gè)滑動(dòng)面如圖：分段 正弦 余弦面積(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.0690.9973.9671.2771.10-4.9328.2420.0470.99911.12200.00199.879.3730.1730.98516.41295.46291.0251.0640.3040.95317.41313.3

6、6313.36298.5350.4340.90120.72373.04336.04161.9960.5650.82523.00413.97341.61233.8070.6900.72419.79356.13257.86245.6480.8100.5869.38168.9198.99136.86K的大小1.30第四個(gè)滑動(dòng)面如圖：分段 正弦 余弦面積(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.5040.86412.08231.80200.18116.8642.512-0.3250.94634.81626.60592.64-203.533-0.1260.99246

7、.92844.51837.75-106.644 -0.0750.9976.06109.08108.78-8.2150.2740.96268.751237.431190.12338.8860.4750.88062.061117.03658.80602.0970.6750.73849.58992.48658.80602.0980.8600.51026.08469.39239.26403.83K的大小1.77第五個(gè)滑動(dòng)面如圖：分段 正弦 余弦面積(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.6200.78419.42349.48274.16-216.7350.182-0.4270.90468.621235.151117.13-526.893-0.2090.97869.271246.691219.42-259.984 -0.0090.99989.321607.691607.62-15.0250.2250.97492.581666.361623.63374.9660.4440.89684.631523.271369.90676.1270.6