中文摘要：

以简单非均质岩质边坡的滑动为研究对象，建立了Sarma法力学模型。根据岩质边坡块体静力平衡条件，得出侧向正压力与临界加速度系数之间的关系，推导了临界加速度系数公式，得到边坡处于地震烈度条件下的安全稳定系数。分析了边坡的安全稳定系数与临界加速度系数之间的函数关系，并利用此函数关系将传统Sarma法进行了改进。计算结果表明：岩质边坡安全稳定系数与临界加速度系数之间呈单调递减的函数关系；与传统Sarma法相比，改进Sarma法无需迭代，不存在收敛性问题，算例分析中仅需6次计算就得到结果，并能满足要求。

英文摘要：

The glide of simple heterogeneous rock slope was taken as research object, a mechanical model based on Sarma method was built. According to the static equilibrium condition of rock slope block, the relationship between critical acceleration coefficient and lateral normal pressure was got. The formula of critical acceleration coefficient was deduced, and the safety stability factor of slope under the condition of seismic intensity was got. The function relationship between safety stability factor and critical acceleration coefficient was analyzed, and the traditional Sarma method was improved by using the function relationship. Calculation result shows that the function relationship between safety stability factor and critical acceleration coefficient is monotone decreasing. Compared with the traditional Sarma method, the improved Sarma method does not need iteration, and does not exist convergence problem. The calculation number of example is only 6, and the calculation result meets requirement. 1 tab, 3 figs, 12 refs.