本文選題：土巖雙元基坑邊坡 + 破壞模式　； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：基于濟(jì)南市土巖地質(zhì)條件,運(yùn)用PLAXIS 3D有限元軟件,分析典型土巖雙元地層結(jié)構(gòu)基坑邊坡破壞模式,研究微型樁復(fù)合土釘墻與吊腳樁支護(hù)結(jié)構(gòu)的變形及受力規(guī)律,取得結(jié)論如下:1、破壞模式土+全風(fēng)化巖邊坡可視為整體土層,破壞模式為圓弧滑動面;土+全風(fēng)化巖石+強(qiáng)風(fēng)化巖石型邊坡,坡率大于1:0.8時,土層、全風(fēng)化巖層和部分強(qiáng)風(fēng)化巖層發(fā)生圓弧滑動破壞;坡率小于1:0.8時,土層全風(fēng)化巖層發(fā)生圓弧滑動破壞,破壞面底端與強(qiáng)風(fēng)化巖層界面相切,強(qiáng)風(fēng)化巖層內(nèi)不發(fā)生破壞。土+全風(fēng)化巖石+強(qiáng)風(fēng)化巖石+中風(fēng)化巖石型基坑,坡率大于1:0.8時,土層、全風(fēng)化巖層和部分強(qiáng)風(fēng)化巖層發(fā)生圓弧滑動破壞;坡率小于1:0.8時,土層全風(fēng)化巖層發(fā)生圓弧滑動破壞,破壞面底端與強(qiáng)風(fēng)化巖層界面相切;中風(fēng)化巖層始終不發(fā)生破壞。2、微型樁復(fù)合土釘墻支護(hù)結(jié)構(gòu)相對樁錨支護(hù)結(jié)構(gòu)來說,樁徑小,樁身材料強(qiáng)度高,樁間距緊密;變形控制效果略弱于樁錨支護(hù)結(jié)構(gòu),內(nèi)力控制效果優(yōu)于樁錨支護(hù)結(jié)構(gòu)。內(nèi)力峰值狀態(tài)在開挖至中風(fēng)化巖層界面時出現(xiàn),變形峰值狀態(tài)在開挖至基坑底時出現(xiàn),破壞面為一條位于土層和碎石層內(nèi)部的圓弧滑動面,底端相切于中風(fēng)化巖界面。3、吊腳支護(hù)樁結(jié)構(gòu)樁體的變形以及內(nèi)力峰值狀態(tài)在開挖至中風(fēng)化巖層界面時出現(xiàn)。破壞面為一條位于土層內(nèi)部的圓弧滑動面,底端相切于土巖界面,中風(fēng)化巖層不會破壞。吊腳樁嵌固1.5m和巖肩寬度0.5-1m為吊腳支護(hù)樁結(jié)構(gòu)最佳構(gòu)造,利于內(nèi)力和位移控制。
[Abstract]:Based on the geological conditions of soil and rock in Jinan city, the failure mode of foundation pit slope of typical soil-rock double-element formation structure is analyzed by using PLAXIS 3D finite element software, and the deformation and force law of micro-pile composite soil nailing wall and hoisting pile supporting structure are studied. The results are as follows: 1. The soil weathered rock slope can be regarded as a whole soil layer, the failure mode is a circular sliding surface, and the soil layer with a slope ratio greater than 1: 0.8 is strongly weathered rock slope with soil weathering rock. When the slope ratio is less than 1: 0.8, the total weathered rock layer will be destroyed by arc sliding, the interface between the bottom of the failure surface and the strongly weathered rock layer will be tangent, and the strong weathered rock layer will not be destroyed. When the slope ratio is greater than 1: 0.8, the circular sliding failure occurs in soil layer, weathered rock layer and part of strongly weathered rock layer, and when the slope ratio is less than 1: 0.8, The total weathering rock layer of soil layer is destroyed by arc sliding, and the bottom end of the failure surface is tangent to the interface of strongly weathered rock layer, and the medium weathered rock layer does not occur damage of .2. the pile diameter is small relative to the pile anchor support structure of the micro-pile composite soil nailing wall. The effect of deformation control is slightly weaker than that of pile-anchor support structure, and the effect of internal force control is better than that of pile-anchor support structure. The peak state of internal force appears at the interface between excavation and middle weathering strata, and the peak state of deformation occurs when excavating to the bottom of foundation pit. The failure surface is a circular slip surface located in the soil layer and the gravel layer. The bottom end is tangent to the interface of medium weathered rock. The deformation of pile body and the peak state of internal force of suspending support pile structure appear at the interface between excavation and middle weathering strata. The failure surface is a circular slip surface located inside the soil layer, and the bottom end is cut to the interface of the earth rock, and the middle weathered rock layer will not be destroyed. The optimum structure of hoisting support pile is 1.5 m fixed and 0.5-1m width of rock shoulder, which is favorable for internal force and displacement control.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753

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