为研究砂卵石地层中土压平衡盾构刀土相互作用的力学行为，揭示楔犁刀的楔犁松动机制，首先，将刀盘前方砂卵石地层等效为连续介质，采用Terzaghi地基承载力模型与Mckyes-Ali模型求解楔犁刀楔犁松动作用下砂卵石地层的破坏强度；
然后，引入楔犁指数k表征楔犁刀反复松动地层、地层颗粒间咬合作用被逐渐破坏、地层强度逐渐降低的楔犁松动状态，分析复杂刀具配置条件下整盘刀具楔犁地层时的受力情况；
最后，通过计算得到单把楔犁刀楔犁地层所需的环向松动力及轴向顶进力，并提出砂卵石地层楔犁刀梯次松动地层与刮刀剥落渣土的受力计算方法，得到整盘刀具松动地层所需的扭矩及贯入推力，分析贯入推力和扭矩的影响因素。采用本文提出的计算分析方法计算土压平衡盾构楔犁刀与刮刀组合松动砂卵石地层时刀具的受力（推力和扭矩）与工程实测结果基本相符。研究结果表明：
楔犁刀分层、超前于刮刀布置可以有效降低松动地层所需的贯入推力和扭矩，达到降低盾构掘进所需总推力及总扭矩的目的。
To investigate the mechanical behavior of the
interaction between cutters on an earth pressure balance shield and the sandy
gravel strata as well as reveal the loosening mechanism of wedgeshaped
cutters, the sandy gravel strata ahead of the cutterhead are regarded as a
continuous medium, and the failure strength of the strata under loosening
effect of a wedgeshaped cutter is determined using the
Terzaghi bearing capacity formula and MckyesAli model.
Then, the plow loosening index [WT《TNR#I》]k[WT《TNR》] is
introduced to characterize the principle of plow loosening when the wedgeshaped cutter repeatedly cuts the strata, the friction and strength
between particles are gradually reduced, and the stratum force under the cutterhead
cutting has a complex cutter arrangement. The circumferentialloosening force and axialjacking thrust
required for strata cutting by a single wedgeshaped
cutter are calculated, stress calculation methods for loosening the wedgeshaped cutter and dropping the scrape cutter are proposed, the
torque and penetration thrust required by the cutterhead are obtained, and the
influence factors of both thrust and torque are analyzed. The stress
state(torque and thrust) of wedgeshaped cutters and
scrapers calculated using the proposed methods agree well with the monitoring
results, demonstrating that the thrust and torque of the cutterhead required
for strata cutting can effectively reduce the layered arrangement of wedgeshaped cutters ahead of scrapers,
thereby reducing the total thrust and total torque of the shield.
