本文關(guān)鍵詞： 無桿鉆具 支護(hù)結(jié)構(gòu) 穩(wěn)定性 附加應(yīng)力 虛擬土柱　出處：《華南理工大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年05期 　論文類型：期刊論文

【摘要】：為使無桿鉆具能有效支撐在孔壁土體上,探討了支護(hù)結(jié)構(gòu)施加的預(yù)應(yīng)力對孔壁土體穩(wěn)定性的影響,提出了采用虛擬土柱模擬樁孔并結(jié)合廣義Mindlin解的方法,推導(dǎo)了預(yù)應(yīng)力作用下孔壁土體中任一點(diǎn)的附加應(yīng)力向量.基于此附加應(yīng)力向量,求取了最大預(yù)扭矩和最大預(yù)壓力作用下支護(hù)板下方5 mm、寬50 mm處各點(diǎn)的剪切應(yīng)力及其相對強(qiáng)度.結(jié)果表明:當(dāng)預(yù)扭矩與預(yù)應(yīng)力分別為120 k N·m和100 k N時(shí),最大剪切應(yīng)力為6.52 MPa;除了支護(hù)板兩端部外,剪切應(yīng)力相對強(qiáng)度均小于1,即總體上孔壁土體為穩(wěn)定狀態(tài).與試驗(yàn)結(jié)果的對比驗(yàn)證了文中方法的正確性,文中方法比Boussinesq-Gerruti聯(lián)合求解法和有限元法更加精確
[Abstract]:In order to support the hole wall soil effectively, the influence of the prestressing force applied by the supporting structure on the stability of the hole wall soil is discussed. A method of simulating pile holes with virtual soil columns and combining with generalized Mindlin solution is proposed. The additional stress vector at any point in the soil under prestressing force is derived and based on this additional stress vector. Under the action of maximum pre-torque and maximum pre-pressure, 5 mm below the supporting plate is obtained. The shear stress and relative strength of each point at the width of 50 mm. The results show that when the pre-torque and prestress are 120 KN 路m and 100 KN, respectively. The maximum shear stress is 6.52 MPA; Except for the two ends of the support plate, the relative strength of shear stress is less than 1, that is, the overall soil mass of the hole wall is stable. The comparison with the experimental results verifies the correctness of the method in this paper. The method in this paper is more accurate than Boussinesq-Gerruti combined solution and finite element method.
【作者單位】： 哈爾濱工業(yè)大學(xué)機(jī)電工程學(xué)院;
【基金】：國家國際科技合作專項(xiàng)(2015DFA70100)~~
【分類號】：TU631
【正文快照】： 無桿鉆具[1]鉆進(jìn)土體之前,支護(hù)結(jié)構(gòu)預(yù)應(yīng)力通過支護(hù)板傳遞給孔壁土體,進(jìn)而平衡螺旋鉆頭所受切削阻力矩和貫入阻力.土體在預(yù)應(yīng)力作用下,其內(nèi)部的應(yīng)力狀態(tài)會發(fā)生改變,從而使土體穩(wěn)定性發(fā)生變化[2-6].因此,為了提高孔壁土體的穩(wěn)定性,保證無桿鉆具的正常作業(yè),研究無桿鉆具作用下孔

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相關(guān)期刊論文 前7條

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本文編號：1444376