Article(id=1152977383100506770, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1152551050662785728, articleNumber=1671-1807(2025)09-0034-05, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1729612800000, receivedDateStr=2024-10-23, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1752820829415, onlineDateStr=2025-07-18, pubDate=1746806400000, pubDateStr=2025-05-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1752820829415, onlineIssueDateStr=2025-07-18, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1752820829415, creator=13701087609, updateTime=1752820829415, updator=13701087609, issue=Issue{id=1152551050662785728, tenantId=1146029695717560320, journalId=1146123222451335185, year='2025', volume='25', issue='9', pageStart='1', pageEnd='371', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1752719183840, creator=13701087609, updateTime=1753063306760, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1153994406857269276, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1152551050662785728, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1153994406857269277, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1152551050662785728, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=34, endPage=38, ext={EN=ArticleExt(id=1152977383683515039, articleId=1152977383100506770, tenantId=1146029695717560320, journalId=1146123222451335185, language=EN, title=Failure Mechanism and Evolution Model of Rainfall Disaster in Colluvial Deposits in Northern Guizhou Mountainous Area, columnId=1151876674645226399, journalTitle=Science Technology and Industry, columnName=Technology Innovation, runingTitle=null, highlight=null, articleAbstract=
Various types of sedimentary deposits are widely distributed in the mountainous areas of northern Guizhou, among which landslide deposits are the most common. A landslide deposit on the inner side of a highway in the region was analyzed. The mechanism and evolution mode of rainfall disasters in the deposit was studied through refined investigation and measurement, numerical simulation and other techniques. The landslide accumulation body was affected by multiple rounds of rainfall in the early stage, and the shallow surface of the slope has experienced multiple local instability and damage, resulting in cracks in the mortar retaining wall, burial of the concrete retaining wall, severe damage to the road surface structure, and difficulty in passage. Under later rainfall conditions, there is still a possibility of local instability or even overall instability. The numerical simulation results of rainfall show that the accumulation body is in an unsaturated state in its natural state. Continuous heavy rainfall will promote the development of the soil from unsaturated to saturated state. During the rainfall process, the transient saturation zone gradually expands and deepens from the slope surface, and by the end of the rainfall, the entire slope soil body has almost reached saturation state. Affected by the water barrier effect of bedrock, infiltrated rainwater collects at the interface between the foundation and the cover, and pore water continuously migrates towards the foot of the slope under the action of gravity, resulting in high pore water pressure at the interface and foot of the slope. On the one hand, the lubrication and softening of gravel soil by pore water promote the structural weakening and mechanical strength attenuation of the soil. On the other hand, high pore water pressure plays a role in reducing the effective stress of the soil, resulting in a decrease in the anti sliding force of the slope, which in turn leads to overall sliding along the foundation cover interface. However, the process of accumulation body developing into landslide under heavy rainfall can be divided into four stages, namely: ①full rainfall infiltration, ②partial saturation of slope surface, ③expansion of saturated area, local instability, ④overall instability and damage. In the early stage, multiple local instability and damage only developed to stage ③. In the later stage, if such heavy rainfall or even extreme rainstorm occurs, the colluvial accumulation body is very likely to have overall damage, which will cause complete road blocking and threaten pedestrians and vehicles in the process.
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黔北山区各种成因堆积体广泛分布,其中崩坡积堆积体最为常见。针对该地区某公路内侧一处崩坡积堆积体进行剖析,通过精细化调查与测量、数值模拟等技术对堆积体降雨灾变机制与演化模式展开研究。该崩坡积堆积体早期受多轮降雨影响,坡体浅表层已发生多次局部失稳破坏,导致浆砌挡土墙开裂、混凝土挡土墙被掩埋,路面结构严重损毁且通行困难,后期降雨条件下仍存在局部失稳甚至整体失稳的可能。降雨数值模拟结果显示,该堆积体在天然状态下处于非饱和状态,持续强降雨将促使土体由非饱和向饱和状态发展,降雨作用下暂态饱和区由坡表逐渐扩展、加深,至降雨结束时整个斜坡土体几乎达到饱和状态。受基岩隔水作用影响,下渗雨水在基覆界面处汇集,孔隙水在重力作用下不断向坡脚运移,导致基覆界面、坡脚段具有高孔隙水压力。一方面,孔隙水对块碎石土的润滑、软化促使土体结构性减弱,力学强度衰减。另一方面,高孔隙水压力起到付托减重作用,使土体有效应力降低,两者综合导致坡体抗滑力减小,进而会沿基覆界面发生整体滑动。而强降雨作用下堆积体发展成滑坡的过程可分为4个阶段,即①降雨全面入渗;②坡表局部饱和;③饱和区扩展,局部失稳;④整体失稳破坏。早期多次局部失稳破坏仅发展至阶段③,后期若出现此类强降雨甚至极端暴雨,则该崩坡积堆积体极有可能发生整体破坏,进而会造成道路完全阻断,威胁行人和车辆。
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杨华(1991—),男,贵州贵阳人,工程师,研究方向为地质灾害勘察设计
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杨华(1991—),男,贵州贵阳人,工程师,研究方向为地质灾害勘察设计
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杨华(1991—),男,贵州贵阳人,工程师,研究方向为地质灾害勘察设计
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科学技术与工程,
2019,
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