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1、-二. 边坡稳定性设计初始条件：路线经过区域路基填土为粘土，边坡为梯形边坡，分两级，土力学的指标：塑限14%，液限27%，含水量19%，天然容重18KN/m3，粘聚力19KPa，内摩擦角27，公路按一级公路标准，双向四车道，设计车速为80Km/h，路基宽度为24.5m，荷载为车辆重力标准值550KN，中间护坡道取2m，车道宽度3.75m，硬路肩2.5m，土路肩0.75m，进展最不利布载时对左右各布3辆车。H=16m,H=26m,I1取值1：1.25 , I2取值1：1.25 1.计算参数:2.荷载换算成等效土柱高度荷载横向分布宽度:,由于是双向四车道,进展最不利分布时左右各分布3辆车,故N=6
2、,后轮轮距b=1.8m，相邻两车后轮的中心间距b=1.3m,轮胎着地宽度d=0.6m,则B=61.8+51.3+0.6=17.9m。前后轮最大轴距按照公路工程技术标准规定对于标准车辆荷载为L=12.8m行车荷载换算高度=0.8m3.按照4.5H法确定滑动圆心辅助线边坡的平均坡度i=12/(621.25+2)=12;171:1.4,则的值分别为和，然后绘制5个不同的滑动面，将每个滑动面的土体均分为8个土条，通过Atuo CAD的massprop命令找出每个土条的形心的位置和每个土条的面积S及每个圆弧长L,连接圆心和每个土条的形心并延长圆弧相交于点以圆心为坐标原点，土条中心与圆心的连线与竖直方向的
3、夹角，则稳定系数，通过计算可得每个滑动面的稳定系数。 比例尺是1:50。第一个滑动面如图：分段正弦 余弦面积(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.3620.9328.49152.86142.47-55.4036.272-0.2030.97923.46422.30413.51-85.743-0.0350.99931.95575.14574.80-199.9240.1520.98839.966719.39711.08109.0350.3300.94447.74859.23810.96283.960.5060.86345.5820.48707.87414.8
4、570.6830.73135.37636.57465.10434.6380.8470.53117.66317.81168.88269.23K的大小2.33第二个滑动面如下列图：分段正弦 余弦面积(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.2120.9775.733103.19100.84-21.9232.662-0.0750.99716.06289.31288.31-21.7030.0730.99722.58406.39405.3129.6840.2300.97326.38474.87462.10109.3650.3840.92331.50566.91523
5、.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第三个滑动面如图：分段正弦 余弦面积(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.0690.9973.9671.2771.10-4.9328.2420.0470.99911.12200.00199.879.3730.1730.98516.41295.46291.0251.0640.3040.95317.41313.36313.
6、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第四个滑动面如图：分段正弦 余弦面积(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.5040.86412.08231.80200.18116.8642.512-0.3250.94634.81626.60592.64-203.533-0.1260.99246.92844
7、.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第五个滑动面如图：分段正弦 余弦面积(m2) Gi(KN/m) Ni(KN/m) Ti(KN/m) L(m)1-0.6200.78419.42349.48274.16-216.7350.182-0.4270
8、.90468.621235.151117.13-526.893-0.2090.97869.271246.691219.42-259.984-0.0090.99989.321607.691607.62-15.0250.2250.97492.581666.361623.63374.9660.4440.89684.631523.271369.90676.1270.6610.75069.541251.77939.04827.7380.8650.50339.21705.70354.72610.08K的大小3.32分别将得到的稳定系数画在一个图上可以观察到K的最小值可以取1.301.25，因此边坡是稳定的。. z.
