田毓仁

摘 要：针对建筑工程中边坡稳定性要求，采用实验和数值模拟的方式就二灰土对边坡的稳定性进行研究。首先以石灰、粉煤灰和粘土作为原材料制备混合土，然后通过压缩试验计算试件的轴向应力应变曲线;以FLACD作为数值模拟软件，以试验中获取的参数和原材料作为基础，构建混合土试件模型和边坡模型，并运用强度系数折减法对边坡稳定性系数进行计算，最终得到单一粘合和二灰土的边坡稳定系数。结果表明，基于二灰土的边坡稳定性系数最大，为5.08，是单一粘土安全系数的4.3倍，说明采用二灰土可有效提高边坡的稳定性，而结合二灰土形成机理，是因为二灰土与水形成凝胶材料，具有结构强度高和水稳定性好的特点。

关键词：稳定性;数值模拟;强度折减法;边坡

中图分类号：U414 文献标识码：A 文章编号：1001-5922（2021）04-0123-05

Abstract：According to the requirements of slope stability in construction engineering， the stability of lime flyash soil on slope is studied by experiment and numerical simulation. Firstly， lime， fly ash and clay are used as raw materials to prepare the mixed soil， and then the axial stress-strain curve of the specimen is calculated through the compression test; with FLACD as the numerical simulation software， based on the parameters and raw materials obtained in the test， the mixed soil specimen model and slope model are constructed， and the strength coefficient reduction method is used to calculate the slope stability coefficient， and finally the slope stability coefficient of single bond and lime-ash soil is obtained. The results show that the maximum stability coefficient of slope based on two lime soil is 5.08， which is 4.3 times the safety coefficient of single clay. It shows that two lime soil can effectively improve the stability of slope， and combined with the formation mechanism of lime-fly-ash soil， it is because lime-ash soil and water form a gel material， which has the characteristics of high structural strength and good water stability.

Key words：stability; numerical simulation; strength reduction method; slope

在該工程地基处理过程中，如何做好软地基的处理，是当前思考和研究的重点。由于地基中土自身的密度较大，但强度却比较低，所以很多研究者会在土中加入各种材料。这样的目的是减少土的重量的同时，也提高土的强度，以此减少路基的沉降。而随着工程技术的推进，越来越多的材料被应用到工程中，混合土就是其中典型的代表。所谓的混合土是指两种或者是两种以上所形成土体，早期比较典型的如三合土，由细砂、石灰和粘土组成。这种三合土经一定比例混合后，具备一定的强度和耐水性，并被广泛用于路基垫层等方面。……