中文摘要：

借鉴剑麻等天然纤维加筋土的研究成果,初步确定包括加筋长度、加筋率、加筋位置3种因素的崩岗岩土黄麻纤维加筋条件,通过无侧限抗压强度试验和正交试验设计方法,选出崩岗不同层次土体的最优加筋条件为红土层01：加筋长度为15mm,加筋率为0.35%,加筋位置为整体加筋;红土层02：加筋长度为15mm,加筋率为0.25%,加筋位置为上部加筋;砂土层03：加筋长度为15mm,加筋率为0.35%,加筋位置为整体加筋;碎屑层04：加筋长度为15mm,加筋率为0.30%,加筋位置为下部加筋。通过对比黄麻纤维加筋土和未加筋土的应力应变特性,结果表明：在最优加筋条件下崩岗4层土体的无侧限抗压强度比未加筋土体分别提高了27.81%,29.73%,23.26%,39.58%;未加筋土无侧限抗压强度与加筋土无侧限抗压强度存在线性回归关系（R2=0.977 9）;同时黄麻纤维加筋还限制了土体的横向变形。研究成果为利用生物材料改良崩岗岩土力学性质,提高崩岗稳定性提供科学依据。

英文摘要：

The collapsing of caved walls under gravity is the main reason of the rapid development of slope disintegration.Based on the research results about reinforced soil with natural fiber,such as sisal,the reinforcement conditions of jute fiber for reinforced soils,including reinforced length,reinforced ratio,and reinforced position of jute fiber were determined preliminarily.According to unconfined compressive strength test and orthogonal experiment design method,the best reinforcement conditions for different soil layers in collapsing hill were as follows：for red soil layer 01：reinforced length,reinforced ratio,and reinforced position were 15 mm,0.35%,and the whole soil,respectively;for red soil layer 02：reinforced length,reinforced ratio,and reinforced position were 15 mm,0.25%,and the upper position of soil,respectively;for sandy soil layer 03：reinforced length,reinforced ratio,and reinforced position were 15 mm,0.35%,and the whole soil,respectively;for detritus layer 04：reinforced length,reinforced ratio,and reinforced position were 15 mm,0.30%and the lower position of soil,respectively.By comparing the stress-strain properties of reinforced and unreinforced soil,we found that the unconfined compressive strengths of the reinforced soil in the 4soil layers of collapsing hill under optimal reinforcement conditions were 27.81%,29.73%,23.26%,and 39.58% higher than those of unreinforced soil in the 4soil layers,respectively.Linear regression relation exited between unconfined compressive strengths of unreinforced and reinforced soil（R2=0.977 9）.Moreover,the transverse deformation of reinforced soil can be restrained by adding jute fiber.The results provided scientific basis of using biomaterials to improve mechanical properties and stability of soil in collapsing hill.