某高速公路岩堆体特征及对路基工程影响分析

Analysis of Characteristics of the Rocky Heaps and the Engineering Effect for Subgrade in a Highway

研究目的:四川某高速公路威远段为典型的四川盆地红层地貌,分布有大量的岩堆体,如处理不当,将对高速公路的安全以及投资控制带来极大的风险。本文从岩堆体形态、物质组成及物理力学性质,以及地下水等影响因素入手,对岩堆体路基工程的稳定以及工程措施进行分析。研究结论:(1)段内岩堆体形态较为单一,大多呈单坡型,对于路基工程可能引起的岩堆体失稳,锚固桩是主要加固措施;(2)岩堆体上部一般为低液限黏土夹碎石,下层为块石土夹低液限黏土,具有明显的分层性,土石界面以及两种土层的分界面均为最可能的潜在滑动面;(3)地下水较为发育,应加强坡面及岩堆体内部排水;(4)本文研究成果可为类似工程提供参考。

Research purposes： There are widely distributing of rocky heaps along the highway in weiyuan, a typical Sichuan Basin red beds landform. If handled improperly, the safety and investment of the highway will bring great risk. Through the analysis of the the influencing factors , such as the form, the composition and the mechanical properties of the rocky heaps, as well as groundwater, the stability and the engineering measures were studied. Research conclusions： （ 1 ） The single - slop is the mostly type of the rocky heap in the projection, anchor pile is the main reinforcement measure of the unstable rocky heaps caused by the subgrade engineering ; （2） There is a layer of low liquid limit clay folder gravel on top of the rocky heap, and lower stone soil folder low liquid limit clay on the bottom, it has obvious layered characteristics, the interface of the soil -rock and the different soil layer are the mostly potential sliding surface ; （3） The groundwater is well developed, the drainage of slop and underground water of the rock heaps should be strengthened; （4） The research results can provide references for the similar projects.